diff --git a/etc/config/assembly.amazon.properties b/etc/config/assembly.amazon.properties
index 243c813ba..fd2511cde 100644
--- a/etc/config/assembly.amazon.properties
+++ b/etc/config/assembly.amazon.properties
@@ -193,7 +193,7 @@ compiler.gnuasriscv32g1510.name=RISC-V binutils 2.45.0
 compiler.gnuasriscv32g1510.semver=2.45.0
 compiler.gnuasriscv32g1510.objdumper=/opt/compiler-explorer/riscv32/gcc-15.1.0/riscv32-unknown-linux-gnu/bin/riscv32-unknown-linux-gnu-objdump
 
-group.llvmas.compilers=llvmas30:llvmas31:llvmas32:llvmas33:llvmas341:llvmas350:llvmas351:llvmas352:llvmas37x:llvmas36x:llvmas371:llvmas380:llvmas381:llvmas390:llvmas391:llvmas400:llvmas401:llvmas500:llvmas600:llvmas700:llvmas800:llvmas900:llvmas1000:llvmas1001:llvmas1100:llvmas1101:llvmas1200:llvmas1201:llvmas1300:llvmas1400:llvmas1500:llvmas1600:llvmas1701:llvmas1810:llvmas1910:llvmas2010:llvmas_trunk:llvmas_assertions_trunk
+group.llvmas.compilers=llvmas30:llvmas31:llvmas32:llvmas33:llvmas341:llvmas350:llvmas351:llvmas352:llvmas37x:llvmas36x:llvmas371:llvmas380:llvmas381:llvmas390:llvmas391:llvmas400:llvmas401:llvmas500:llvmas600:llvmas700:llvmas800:llvmas900:llvmas1000:llvmas1001:llvmas1100:llvmas1101:llvmas1200:llvmas1201:llvmas1300:llvmas1400:llvmas1500:llvmas1600:llvmas1701:llvmas1810:llvmas1910:llvmas2010:llvmas2110:llvmas_trunk:llvmas_assertions_trunk
 group.llvmas.versionFlag=--version
 group.llvmas.options=-filetype=obj -o example.o
 group.llvmas.versionRe=LLVM version .*
@@ -272,6 +272,8 @@ compiler.llvmas1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/llvm-mc
 compiler.llvmas1910.semver=19.1.0
 compiler.llvmas2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/llvm-mc
 compiler.llvmas2010.semver=20.1.0
+compiler.llvmas2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/llvm-mc
+compiler.llvmas2110.semver=21.1.0
 compiler.llvmas_trunk.exe=/opt/compiler-explorer/clang-trunk/bin/llvm-mc
 compiler.llvmas_trunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.llvmas_trunk.semver=(trunk)
diff --git a/etc/config/c++.amazon.properties b/etc/config/c++.amazon.properties
index 1b39f8abf..6fb1cb9d5 100644
--- a/etc/config/c++.amazon.properties
+++ b/etc/config/c++.amazon.properties
@@ -304,7 +304,7 @@ compiler.g152assert.semver=15.2 (assertions)
 
 ################################
 # Clang for x86
-group.clang.compilers=&clangx86assert:clang30:clang31:clang32:clang33:clang341:clang350:clang351:clang352:clang37x:clang36x:clang371:clang380:clang381:clang390:clang391:clang400:clang401:clang500:clang501:clang502:clang600:clang601:clang700:clang701:clang710:clang800:clang801:clang900:clang901:clang1000:clang1001:clang1100:clang1101:clang1200:clang1201:clang1300:clang1301:clang1400:clang1500:clang1600:clang1701:clang1810:clang1910:clang2010
+group.clang.compilers=&clangx86assert:clang30:clang31:clang32:clang33:clang341:clang350:clang351:clang352:clang37x:clang36x:clang371:clang380:clang381:clang390:clang391:clang400:clang401:clang500:clang501:clang502:clang600:clang601:clang700:clang701:clang710:clang800:clang801:clang900:clang901:clang1000:clang1001:clang1100:clang1101:clang1200:clang1201:clang1300:clang1301:clang1400:clang1500:clang1600:clang1701:clang1810:clang1910:clang2010:clang2110
 group.clang.intelAsm=-mllvm --x86-asm-syntax=intel
 group.clang.options=--gcc-toolchain=/opt/compiler-explorer/gcc-7.2.0
 group.clang.groupName=Clang x86-64
@@ -491,6 +491,11 @@ compiler.clang2010.semver=20.1.0
 compiler.clang2010.options=--gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0
 compiler.clang2010.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
 compiler.clang2010.debugPatched=true
+compiler.clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.clang2110.semver=21.1.0
+compiler.clang2110.options=--gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0
+compiler.clang2110.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
+compiler.clang2110.debugPatched=true
 
 
 group.clangx86trunk.compilers=clang_trunk:clang_assertions_trunk:clang_concepts:clang_p1144:clang_autonsdmi:clang_bb_p2996:clang_p2998:clang_p3068:clang_p3309:clang_p3367:clang_p3372:clang_p3385:clang_p3412:clang_p3776:clang_implicit_constexpr:clang_lifetime:clang_p1061:clang_parmexpr:clang_patmat:clang_embed:clang_dang:clang_reflection:clang_variadic_friends:clang_widberg:clang_resugar:clang_clangir:clang_dascandy_contracts:clang_ericwf_contracts:clang_p1974:clang_chrisbazley
@@ -624,7 +629,7 @@ compiler.clang_p1974.exe=/opt/compiler-explorer/clang-p1974-trunk/bin/clang++
 compiler.clang_p1974.semver=(p1974)
 compiler.clang_p1974.notification=p1974; see <a href="https://github.com/je4d/llvm-project/tree/godbolt/propconst" target="_blank" rel="noopener noreferrer">je4d/llvm-project<sup><small class="fas fa-external-link-alt opens-new-window" title="Opens in a new window"></small></sup></a>
 
-group.clangx86assert.compilers=clang26assert:clang27assert:clang28assert:clang29assert:clang30assert:clang31assert:clang32assert:clang33assert:clang34assert:clang35assert:clang36assert:clang37assert:clang38assert:clang39assert:clang40assert:clang50assert:clang60assert:clang70assert:clang80assert:clang90assert:clang100assert:clang110assert:clang120assert:clang130assert:clang140assert:clang150assert:clang160assert:clang170assert:clang181assert:clang191assert:clang201assert
+group.clangx86assert.compilers=clang26assert:clang27assert:clang28assert:clang29assert:clang30assert:clang31assert:clang32assert:clang33assert:clang34assert:clang35assert:clang36assert:clang37assert:clang38assert:clang39assert:clang40assert:clang50assert:clang60assert:clang70assert:clang80assert:clang90assert:clang100assert:clang110assert:clang120assert:clang130assert:clang140assert:clang150assert:clang160assert:clang170assert:clang181assert:clang191assert:clang201assert:clang211assert
 group.clangx86assert.options=
 group.clangx86assert.groupName=Clang x86-64 (assertions)
 group.clangx86assert.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
@@ -738,6 +743,10 @@ compiler.clang201assert.exe=/opt/compiler-explorer/clang-assertions-20.1.0/bin/c
 compiler.clang201assert.semver=20.1.0 (assertions)
 compiler.clang201assert.options=--gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0
 compiler.clang201assert.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
+compiler.clang211assert.exe=/opt/compiler-explorer/clang-assertions-21.1.0/bin/clang++
+compiler.clang211assert.semver=21.1.0 (assertions)
+compiler.clang211assert.options=--gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0
+compiler.clang211assert.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
 
 group.clang-rocm.compilers=clang-rocm-trunk:clang-rocm-40502:clang-rocm-50002:clang-rocm-50103:clang-rocm-50203:clang-rocm-50303:clang-rocm-50700:clang-rocm-60002:clang-rocm-60102:clang-rocm-60204:clang-rocm-60303:clang-rocm-60400
 group.clang-rocm.intelAsm=-mllvm --x86-asm-syntax=intel
@@ -814,7 +823,7 @@ compiler.clang-rocm-60400.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unkn
 # Clang for Arm
 # Provides 32-bit menu items for release versions and trunk
 group.armclang32.groupName=Arm 32-bit clang
-group.armclang32.compilers=armv7-clang900:armv7-clang901:armv7-clang1000:armv7-clang1001:armv7-clang1100:armv7-clang1101:armv7-clang1200:armv7-clang1201:armv7-clang1300:armv7-clang1301:armv7-clang1400:armv7-clang1500:armv7-clang1600:armv7-clang1701:armv7-clang1810:armv7-clang1910:armv7-clang2010:armv7-clang-trunk
+group.armclang32.compilers=armv7-clang900:armv7-clang901:armv7-clang1000:armv7-clang1001:armv7-clang1100:armv7-clang1101:armv7-clang1200:armv7-clang1201:armv7-clang1300:armv7-clang1301:armv7-clang1400:armv7-clang1500:armv7-clang1600:armv7-clang1701:armv7-clang1810:armv7-clang1910:armv7-clang2010:armv7-clang2110:armv7-clang-trunk
 group.armclang32.isSemVer=true
 group.armclang32.compilerType=clang
 group.armclang32.supportsExecute=false
@@ -827,6 +836,9 @@ group.armclang32.licensePreamble=The LLVM Project is under the Apache License v2
 group.armclang32.compilerCategories=clang
 group.armclang32.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.armv7-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.armv7-clang2110.semver=21.1.0
+compiler.armv7-clang2110.options=-target arm-unknown-linux-gnueabihf --gcc-toolchain=/opt/compiler-explorer/arm/gcc-15.2.0/arm-unknown-linux-gnueabihf --sysroot=/opt/compiler-explorer/arm/gcc-15.2.0/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot
 compiler.armv7-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.armv7-clang2010.semver=20.1.0
 compiler.armv7-clang2010.options=-target arm-unknown-linux-gnueabihf --gcc-toolchain=/opt/compiler-explorer/arm/gcc-14.2.0/arm-unknown-linux-gnueabihf --sysroot=/opt/compiler-explorer/arm/gcc-14.2.0/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot
@@ -894,7 +906,7 @@ compiler.armv7-clang-trunk.options=-target arm-linux-gnueabihf --gcc-toolchain=/
 # Clang for Arm
 # Provides 64- menu items for clang-9, clang-10 and trunk
 group.armclang64.groupName=Arm 64-bit clang
-group.armclang64.compilers=armv8-clang900:armv8-clang901:armv8-clang1000:armv8-clang1001:armv8-clang1100:armv8-clang1101:armv8-clang1200:armv8-clang1300:armv8-clang1400:armv8-clang1500:armv8-clang1600:armv8-clang1701:armv8-clang1810:armv8-clang1910:armv8-clang2010:armv8-clang-trunk:armv8-full-clang-trunk
+group.armclang64.compilers=armv8-clang900:armv8-clang901:armv8-clang1000:armv8-clang1001:armv8-clang1100:armv8-clang1101:armv8-clang1200:armv8-clang1300:armv8-clang1400:armv8-clang1500:armv8-clang1600:armv8-clang1701:armv8-clang1810:armv8-clang1910:armv8-clang2010:armv8-clang2110:armv8-clang-trunk:armv8-full-clang-trunk
 group.armclang64.isSemVer=true
 group.armclang64.baseName=armv8-a clang
 group.armclang64.compilerType=clang
@@ -908,6 +920,9 @@ group.armclang64.compilerCategories=clang
 group.armclang64.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 group.armclang64.objdumper=/opt/compiler-explorer/arm64/gcc-15.1.0/aarch64-unknown-linux-gnu/bin/aarch64-unknown-linux-gnu-objdump
 
+compiler.armv8-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.armv8-clang2110.semver=21.1.0
+compiler.armv8-clang2110.options=-target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-15.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-15.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot
 compiler.armv8-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.armv8-clang2010.semver=20.1.0
 compiler.armv8-clang2010.options=-target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-14.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-14.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot
@@ -1105,7 +1120,7 @@ group.rvclang.licenseLink=https://github.com/llvm/llvm-project/blob/main/LICENSE
 group.rvclang.licensePreamble=The LLVM Project is under the Apache License v2.0 with LLVM Exceptions
 group.rvclang.debugPatched=true
 
-group.rv32clang.compilers=rv32-clang:rv32-clang2010:rv32-clang1910:rv32-clang1810:rv32-clang1701:rv32-clang1600:rv32-clang1500:rv32-clang1400:rv32-clang1301:rv32-clang1300:rv32-clang1201:rv32-clang1200:rv32-clang1101:rv32-clang1100:rv32-clang1001:rv32-clang1000:rv32-clang901:rv32-clang900
+group.rv32clang.compilers=rv32-clang:rv32-clang2110:rv32-clang2010:rv32-clang1910:rv32-clang1810:rv32-clang1701:rv32-clang1600:rv32-clang1500:rv32-clang1400:rv32-clang1301:rv32-clang1300:rv32-clang1201:rv32-clang1200:rv32-clang1101:rv32-clang1100:rv32-clang1001:rv32-clang1000:rv32-clang901:rv32-clang900
 group.rv32clang.options=-target riscv32-unknown-elf -march=rv32gc -mabi=ilp32d --gcc-toolchain=/opt/compiler-explorer/riscv32/gcc-10.2.0/riscv32-unknown-elf
 group.rv32clang.objdumper=/opt/compiler-explorer/riscv32/gcc-10.2.0/riscv32-unknown-elf/bin/riscv32-unknown-elf-objdump
 group.rv32clang.baseName=RISC-V rv32gc clang
@@ -1157,6 +1172,9 @@ compiler.rv32-clang1910.options=-target riscv32-unknown-linux-gnu -march=rv32gc
 compiler.rv32-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.rv32-clang2010.semver=20.1.0
 compiler.rv32-clang2010.options=-target riscv32-unknown-linux-gnu -march=rv32gc -mabi=ilp32d --gcc-toolchain=/opt/compiler-explorer/riscv32/gcc-14.2.0/riscv32-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv32/gcc-14.2.0/riscv32-unknown-linux-gnu/riscv32-unknown-linux-gnu/sysroot
+compiler.rv32-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.rv32-clang2110.semver=21.1.0
+compiler.rv32-clang2110.options=-target riscv32-unknown-linux-gnu -march=rv32gc -mabi=ilp32d --gcc-toolchain=/opt/compiler-explorer/riscv32/gcc-15.2.0/riscv32-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv32/gcc-15.2.0/riscv32-unknown-linux-gnu/riscv32-unknown-linux-gnu/sysroot
 compiler.rv32-clang.exe=/opt/compiler-explorer/clang-trunk/bin/clang++
 compiler.rv32-clang.semver=(trunk)
 compiler.rv32-clang.objdumper=/opt/compiler-explorer/riscv32/gcc-14.2.0/riscv32-unknown-elf/bin/riscv32-unknown-elf-objdump
@@ -1164,7 +1182,7 @@ compiler.rv32-clang.isNightly=true
 compiler.rv32-clang.alias=rv32clang
 compiler.rv32-clang.options=-target riscv32-unknown-linux-gnu -march=rv32gc -mabi=ilp32d --gcc-toolchain=/opt/compiler-explorer/riscv32/gcc-14.2.0/riscv32-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv32/gcc-14.2.0/riscv32-unknown-linux-gnu/riscv32-unknown-linux-gnu/sysroot
 
-group.rv64clang.compilers=rv64-clang:rv64-clang2010:rv64-clang1910:rv64-clang1810:rv64-clang1701:rv64-clang1600:rv64-clang1500:rv64-clang1400:rv64-clang1301:rv64-clang1300:rv64-clang1201:rv64-clang1200:rv64-clang1101:rv64-clang1100:rv64-clang1001:rv64-clang1000:rv64-clang901:rv64-clang900
+group.rv64clang.compilers=rv64-clang:rv64-clang2110:rv64-clang2010:rv64-clang1910:rv64-clang1810:rv64-clang1701:rv64-clang1600:rv64-clang1500:rv64-clang1400:rv64-clang1301:rv64-clang1300:rv64-clang1201:rv64-clang1200:rv64-clang1101:rv64-clang1100:rv64-clang1001:rv64-clang1000:rv64-clang901:rv64-clang900
 group.rv64clang.options=-target riscv64-unknown-linux-gnu -march=rv64gc -mabi=lp64d --gcc-toolchain=/opt/compiler-explorer/riscv64/gcc-10.2.0/riscv64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv64/gcc-10.2.0/riscv64-unknown-linux-gnu/riscv64-unknown-linux-gnu/sysroot
 group.rv64clang.objdumper=/opt/compiler-explorer/riscv64/gcc-10.2.0/riscv64-unknown-linux-gnu/bin/riscv64-unknown-linux-gnu-objdump
 group.rv64clang.baseName=RISC-V rv64gc clang
@@ -1216,6 +1234,9 @@ compiler.rv64-clang1910.options=-target riscv64-unknown-linux-gnu -march=rv64gc
 compiler.rv64-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.rv64-clang2010.semver=20.1.0
 compiler.rv64-clang2010.options=-target riscv64-unknown-linux-gnu -march=rv64gc -mabi=lp64d --gcc-toolchain=/opt/compiler-explorer/riscv64/gcc-14.2.0/riscv64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv64/gcc-14.2.0/riscv64-unknown-linux-gnu/riscv64-unknown-linux-gnu/sysroot
+compiler.rv64-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.rv64-clang2110.semver=21.1.0
+compiler.rv64-clang2110.options=-target riscv64-unknown-linux-gnu -march=rv64gc -mabi=lp64d --gcc-toolchain=/opt/compiler-explorer/riscv64/gcc-15.2.0/riscv64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv64/gcc-15.2.0/riscv64-unknown-linux-gnu/riscv64-unknown-linux-gnu/sysroot
 compiler.rv64-clang.exe=/opt/compiler-explorer/clang-trunk/bin/clang++
 compiler.rv64-clang.semver=(trunk)
 compiler.rv64-clang.objdumper=/opt/compiler-explorer/riscv64/gcc-14.2.0/riscv64-unknown-linux-gnu/bin/riscv64-unknown-linux-gnu-objdump
@@ -1287,9 +1308,9 @@ compiler.clang2010_clad200.options=--gcc-toolchain=/opt/compiler-explorer/gcc-13
 compiler.clang2010_clad200.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
 compiler.clang2010_clad200.debugPatched=true
 compiler.clad_trunk.alias=clang1810_clad_trunk
-compiler.clad_trunk.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
-compiler.clad_trunk.name=clad trunk (clang 20.1.0)
-compiler.clad_trunk.options=--gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0 -fplugin=/opt/compiler-explorer/clang-plugins/clad-trunk-clang-20.1.0/lib/clad.so -I/opt/compiler-explorer/clang-plugins/clad-trunk-clang-20.1.0/include
+compiler.clad_trunk.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.clad_trunk.name=clad trunk (clang 21.1.0)
+compiler.clad_trunk.options=--gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0 -fplugin=/opt/compiler-explorer/clang-plugins/clad-trunk-clang-21.1.0/lib/clad.so -I/opt/compiler-explorer/clang-plugins/clad-trunk-clang-21.1.0/include
 compiler.clad_trunk.ldPath=${exePath}/../lib|${exePath}/../lib/x86_64-unknown-linux-gnu
 compiler.clad_trunk.debugPatched=true
 
@@ -1303,7 +1324,7 @@ group.loongarch-clang.licenseName=LLVM Apache 2
 group.loongarch-clang.licenseLink=https://github.com/llvm/llvm-project/blob/main/LICENSE.TXT
 group.loongarch-clang.licensePreamble=The LLVM Project is under the Apache License v2.0 with LLVM Exceptions
 
-group.loongarch64clang.compilers=loongarch64-clangtrunk:loongarch64-clang1701:loongarch64-clang1810:loongarch64-clang1910:loongarch64-clang2010
+group.loongarch64clang.compilers=loongarch64-clangtrunk:loongarch64-clang1701:loongarch64-clang1810:loongarch64-clang1910:loongarch64-clang2010:loongarch64-clang2110
 group.loongarch64clang.options=-target loongarch64-unknown-linux-gnu --gcc-toolchain=/opt/compiler-explorer/loongarch64/gcc-13.3.0/loongarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/loongarch64/gcc-13.3.0/loongarch64-unknown-linux-gnu/loongarch64-unknown-linux-gnu/sysroot
 group.loongarch64clang.objdumper=/opt/compiler-explorer/loongarch64/gcc-13.3.0/loongarch64-unknown-linux-gnu/bin/loongarch64-unknown-linux-gnu-objdump
 group.loongarch64clang.baseName=LoongArch64 clang
@@ -1321,6 +1342,9 @@ compiler.loongarch64-clang1910.options=-target loongarch64-unknown-linux-gnu --g
 compiler.loongarch64-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.loongarch64-clang2010.semver=20.1.0
 compiler.loongarch64-clang2010.options=-target loongarch64-unknown-linux-gnu --gcc-toolchain=/opt/compiler-explorer/loongarch64/gcc-14.2.0/loongarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/loongarch64/gcc-14.2.0/loongarch64-unknown-linux-gnu/loongarch64-unknown-linux-gnu/sysroot
+compiler.loongarch64-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.loongarch64-clang2110.semver=21.1.0
+compiler.loongarch64-clang2110.options=-target loongarch64-unknown-linux-gnu --gcc-toolchain=/opt/compiler-explorer/loongarch64/gcc-15.2.0/loongarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/loongarch64/gcc-15.2.0/loongarch64-unknown-linux-gnu/loongarch64-unknown-linux-gnu/sysroot
 compiler.loongarch64-clangtrunk.exe=/opt/compiler-explorer/clang-trunk/bin/clang++
 compiler.loongarch64-clangtrunk.semver=(trunk)
 compiler.loongarch64-clangtrunk.isNightly=true
@@ -1745,7 +1769,7 @@ group.bpf.compilers=&gccbpf:&clangbpf
 group.bpf.demangler=/opt/compiler-explorer/bpf/gcc-trunk/bpf-unknown-none/bin/bpf-unknown-none-c++filt
 
 # Clang for BPF
-group.clangbpf.compilers=bpfclangtrunk:bpfclang2010:bpfclang1910:bpfclang1810:bpfclang1701:bpfclang1600:bpfclang1500:bpfclang1400:bpfclang1300
+group.clangbpf.compilers=bpfclangtrunk:bpfclang2110:bpfclang2010:bpfclang1910:bpfclang1810:bpfclang1701:bpfclang1600:bpfclang1500:bpfclang1400:bpfclang1300
 group.clangbpf.supportsBinary=false
 group.clangbpf.supportsExecute=false
 group.clangbpf.baseName=BPF clang
@@ -1761,6 +1785,9 @@ compiler.bpfclangtrunk.exe=/opt/compiler-explorer/clang-trunk/bin/clang++
 compiler.bpfclangtrunk.semver=(trunk)
 compiler.bpfclangtrunk.isNightly=true
 
+compiler.bpfclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.bpfclang2110.semver=21.1.0
+
 compiler.bpfclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.bpfclang2010.semver=20.1.0
 
@@ -3376,7 +3403,7 @@ group.mipss.isSemVer=true
 # Clang for all MIPS
 
 ## MIPS
-group.mips-clang.compilers=mips-clang2010:mips-clang1910:mips-clang1810:mips-clang1701:mips-clang1600:mips-clang1500:mips-clang1400:mips-clang1300
+group.mips-clang.compilers=mips-clang2110:mips-clang2010:mips-clang1910:mips-clang1810:mips-clang1701:mips-clang1600:mips-clang1500:mips-clang1400:mips-clang1300
 group.mips-clang.groupName=MIPS clang
 group.mips-clang.baseName=mips clang
 group.mips-clang.supportsBinary=false
@@ -3387,6 +3414,10 @@ group.mips-clang.compilerCategories=clang
 group.mips-clang.instructionSet=mips
 group.mips-clang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.mips-clang2110.semver=21.1.0
+compiler.mips-clang2110.options=-target mips-unknown-linux-gnu --gcc-toolchain=/opt/compiler-explorer/mips/gcc-15.2.0/mips-unknown-linux-gnu
+
 compiler.mips-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.mips-clang2010.semver=20.1.0
 compiler.mips-clang2010.options=-target mips-unknown-linux-gnu --gcc-toolchain=/opt/compiler-explorer/mips/gcc-14.2.0/mips-unknown-linux-gnu
@@ -3414,7 +3445,7 @@ compiler.mips-clang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang++
 compiler.mips-clang1300.semver=13.0.0
 
 ## MIPSEL
-group.mipsel-clang.compilers=mipsel-clang2010:mipsel-clang1910:mipsel-clang1810:mipsel-clang1701:mipsel-clang1600:mipsel-clang1500:mipsel-clang1400:mipsel-clang1300
+group.mipsel-clang.compilers=mipsel-clang2110:mipsel-clang2010:mipsel-clang1910:mipsel-clang1810:mipsel-clang1701:mipsel-clang1600:mipsel-clang1500:mipsel-clang1400:mipsel-clang1300
 group.mipsel-clang.instructionSet=mips
 group.mipsel-clang.groupName=MIPSEL clang
 group.mipsel-clang.baseName=mipsel clang
@@ -3425,6 +3456,10 @@ group.mipsel-clang.options=-target mipsel-elf
 group.mipsel-clang.compilerCategories=clang
 group.mipsel-clang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mipsel-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.mipsel-clang2110.semver=21.1.0
+compiler.mipsel-clang2110.options=-target mipsel-multilib-linux-gnu --gcc-toolchain=/opt/compiler-explorer/mipsel/gcc-15.2.0/mipsel-multilib-linux-gnu
+
 compiler.mipsel-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.mipsel-clang2010.semver=20.1.0
 compiler.mipsel-clang2010.options=-target mipsel-multilib-linux-gnu --gcc-toolchain=/opt/compiler-explorer/mipsel/gcc-14.2.0/mipsel-multilib-linux-gnu
@@ -3452,7 +3487,7 @@ compiler.mipsel-clang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang++
 compiler.mipsel-clang1300.semver=13.0.0
 
 ## MIPS64
-group.mips64-clang.compilers=mips64-clang2010:mips64-clang1910:mips64-clang1810:mips64-clang1701:mips64-clang1600:mips64-clang1500:mips64-clang1400:mips64-clang1300
+group.mips64-clang.compilers=mips64-clang2110:mips64-clang2010:mips64-clang1910:mips64-clang1810:mips64-clang1701:mips64-clang1600:mips64-clang1500:mips64-clang1400:mips64-clang1300
 group.mips64-clang.instructionSet=mips
 group.mips64-clang.groupName=MIPS64 clang
 group.mips64-clang.baseName=mips64 clang
@@ -3463,6 +3498,9 @@ group.mips64-clang.options=-target mips64-elf
 group.mips64-clang.compilerCategories=clang
 group.mips64-clang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips64-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.mips64-clang2110.semver=21.1.0
+
 compiler.mips64-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.mips64-clang2010.semver=20.1.0
 
@@ -3488,7 +3526,7 @@ compiler.mips64-clang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang++
 compiler.mips64-clang1300.semver=13.0.0
 
 ## MIPS64EL
-group.mips64el-clang.compilers=mips64el-clang2010:mips64el-clang1910:mips64el-clang1810:mips64el-clang1701:mips64el-clang1600:mips64el-clang1500:mips64el-clang1400:mips64el-clang1300
+group.mips64el-clang.compilers=mips64el-clang2110:mips64el-clang2010:mips64el-clang1910:mips64el-clang1810:mips64el-clang1701:mips64el-clang1600:mips64el-clang1500:mips64el-clang1400:mips64el-clang1300
 group.mips64el-clang.instructionSet=mips
 group.mips64el-clang.groupName=MIPS64EL clang
 group.mips64el-clang.baseName=mips64el clang
@@ -3499,6 +3537,9 @@ group.mips64el-clang.options=-target mips64el-elf
 group.mips64el-clang.compilerCategories=clang
 group.mips64el-clang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips64el-clang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.mips64el-clang2110.semver=21.1.0
+
 compiler.mips64el-clang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.mips64el-clang2010.semver=20.1.0
 
@@ -5759,7 +5800,7 @@ libs.libuv.versions.1381.libpath=/opt/compiler-explorer/libs/libuv/v1.38.1/x86_6
 
 libs.llvm.name=LLVM
 libs.llvm.description=LLVM
-libs.llvm.versions=trunk:401:500:501:502:600:601:700:701:800:900:1000:1001:1100:1200:1201:1300:1301:1400:1406:1500:1507:1600:1606:1701:1706:1810:1910:2010
+libs.llvm.versions=trunk:401:500:501:502:600:601:700:701:800:900:1000:1001:1100:1200:1201:1300:1301:1400:1406:1500:1507:1600:1606:1701:1706:1810:1910:2010:2110
 libs.llvm.url=https://llvm.org/
 libs.llvm.versions.trunk.version=trunk
 libs.llvm.versions.trunk.path=/opt/compiler-explorer/libs/llvm/trunk/include
@@ -5825,6 +5866,10 @@ libs.llvm.versions.2010.version=20.1.0
 libs.llvm.versions.2010.path=/opt/compiler-explorer/libs/llvm/20.1.0/include
 libs.llvm.versions.2010.libpath=/opt/compiler-explorer/libs/llvm/20.1.0/lib
 libs.llvm.versions.2010.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
+libs.llvm.versions.2110.version=21.1.0
+libs.llvm.versions.2110.path=/opt/compiler-explorer/libs/llvm/21.1.0/include
+libs.llvm.versions.2110.libpath=/opt/compiler-explorer/libs/llvm/21.1.0/lib
+libs.llvm.versions.2110.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
 
 libs.llvmfs.name=Filesystem (LLVM)
 libs.llvmfs.versions=autodetect
diff --git a/etc/config/c++.amazonwin.properties b/etc/config/c++.amazonwin.properties
index 56ab1fc7a..139e469af 100644
--- a/etc/config/c++.amazonwin.properties
+++ b/etc/config/c++.amazonwin.properties
@@ -1279,7 +1279,7 @@ libs.llvm.name=LLVM
 libs.llvm.url=https://llvm.org/
 libs.llvm.description=LLVM
 libs.llvm.packagedheaders=true
-libs.llvm.versions=401:500:501:502:600:601:700:701:800:900:1000:1001:1100:1200:1201:1300:1301:1400:1406:1500:1507:1600:1606:1701:1706:1810:1910:2010:trunk
+libs.llvm.versions=401:500:501:502:600:601:700:701:800:900:1000:1001:1100:1200:1201:1300:1301:1400:1406:1500:1507:1600:1606:1701:1706:1810:1910:2010:2110:trunk
 libs.llvm.versions.401.version=4.0.1
 libs.llvm.versions.500.version=5.0.0
 libs.llvm.versions.501.version=5.0.1
@@ -1310,6 +1310,8 @@ libs.llvm.versions.1910.version=19.1.0
 libs.llvm.versions.1910.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
 libs.llvm.versions.2010.version=20.1.0
 libs.llvm.versions.2010.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
+libs.llvm.versions.2110.version=21.1.0
+libs.llvm.versions.2110.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
 libs.llvm.versions.trunk.version=trunk
 libs.llvm.versions.trunk.staticliblink=LLVMWindowsManifest:LLVMXRay:LLVMLibDriver:LLVMDlltoolDriver:LLVMTextAPIBinaryReader:LLVMCoverage:LLVMLineEditor:LLVMXCoreDisassembler:LLVMXCoreCodeGen:LLVMXCoreDesc:LLVMXCoreInfo:LLVMX86TargetMCA:LLVMX86Disassembler:LLVMX86AsmParser:LLVMX86CodeGen:LLVMX86Desc:LLVMX86Info:LLVMWebAssemblyDisassembler:LLVMWebAssemblyAsmParser:LLVMWebAssemblyCodeGen:LLVMWebAssemblyUtils:LLVMWebAssemblyDesc:LLVMWebAssemblyInfo:LLVMVEDisassembler:LLVMVEAsmParser:LLVMVECodeGen:LLVMVEDesc:LLVMVEInfo:LLVMSystemZDisassembler:LLVMSystemZAsmParser:LLVMSystemZCodeGen:LLVMSystemZDesc:LLVMSystemZInfo:LLVMSparcDisassembler:LLVMSparcAsmParser:LLVMSparcCodeGen:LLVMSparcDesc:LLVMSparcInfo:LLVMRISCVTargetMCA:LLVMRISCVDisassembler:LLVMRISCVAsmParser:LLVMRISCVCodeGen:LLVMRISCVDesc:LLVMRISCVInfo:LLVMPowerPCDisassembler:LLVMPowerPCAsmParser:LLVMPowerPCCodeGen:LLVMPowerPCDesc:LLVMPowerPCInfo:LLVMNVPTXCodeGen:LLVMNVPTXDesc:LLVMNVPTXInfo:LLVMMSP430Disassembler:LLVMMSP430AsmParser:LLVMMSP430CodeGen:LLVMMSP430Desc:LLVMMSP430Info:LLVMMipsDisassembler:LLVMMipsAsmParser:LLVMMipsCodeGen:LLVMMipsDesc:LLVMMipsInfo:LLVMLoongArchDisassembler:LLVMLoongArchAsmParser:LLVMLoongArchCodeGen:LLVMLoongArchDesc:LLVMLoongArchInfo:LLVMLanaiDisassembler:LLVMLanaiCodeGen:LLVMLanaiAsmParser:LLVMLanaiDesc:LLVMLanaiInfo:LLVMHexagonDisassembler:LLVMHexagonCodeGen:LLVMHexagonAsmParser:LLVMHexagonDesc:LLVMHexagonInfo:LLVMBPFDisassembler:LLVMBPFAsmParser:LLVMBPFCodeGen:LLVMBPFDesc:LLVMBPFInfo:LLVMAVRDisassembler:LLVMAVRAsmParser:LLVMAVRCodeGen:LLVMAVRDesc:LLVMAVRInfo:LLVMARMDisassembler:LLVMARMAsmParser:LLVMARMCodeGen:LLVMARMDesc:LLVMARMUtils:LLVMARMInfo:LLVMAMDGPUTargetMCA:LLVMAMDGPUDisassembler:LLVMAMDGPUAsmParser:LLVMAMDGPUCodeGen:LLVMAMDGPUDesc:LLVMAMDGPUUtils:LLVMAMDGPUInfo:LLVMAArch64Disassembler:LLVMAArch64AsmParser:LLVMAArch64CodeGen:LLVMAArch64Desc:LLVMAArch64Utils:LLVMAArch64Info:LLVMOrcDebugging:LLVMOrcJIT:LLVMWindowsDriver:LLVMMCJIT:LLVMJITLink:LLVMInterpreter:LLVMExecutionEngine:LLVMRuntimeDyld:LLVMOrcTargetProcess:LLVMOrcShared:LLVMDWP:LLVMDebugInfoLogicalView:LLVMDebugInfoGSYM:LLVMOption:LLVMObjectYAML:LLVMObjCopy:LLVMMCA:LLVMMCDisassembler:LLVMLTO:LLVMFrontendOpenACC:LLVMFrontendHLSL:LLVMFrontendDriver:LLVMExtensions:LLVMPasses:LLVMHipStdPar:LLVMCoroutines:LLVMCFGuard:LLVMipo:LLVMInstrumentation:LLVMVectorize:LLVMLinker:LLVMFrontendOpenMP:LLVMFrontendOffloading:LLVMDWARFLinkerParallel:LLVMDWARFLinkerClassic:LLVMDWARFLinker:LLVMGlobalISel:LLVMMIRParser:LLVMAsmPrinter:LLVMSelectionDAG:LLVMCodeGen:LLVMTarget:LLVMObjCARCOpts:LLVMCodeGenTypes:LLVMIRPrinter:LLVMInterfaceStub:LLVMFileCheck:LLVMFuzzMutate:LLVMScalarOpts:LLVMInstCombine:LLVMAggressiveInstCombine:LLVMTransformUtils:LLVMBitWriter:LLVMAnalysis:LLVMProfileData:LLVMSymbolize:LLVMDebugInfoBTF:LLVMDebugInfoPDB:LLVMDebugInfoMSF:LLVMDebugInfoDWARF:LLVMObject:LLVMTextAPI:LLVMMCParser:LLVMIRReader:LLVMAsmParser:LLVMMC:LLVMDebugInfoCodeView:LLVMBitReader:LLVMFuzzerCLI:LLVMCore:LLVMRemarks:LLVMBitstreamReader:LLVMBinaryFormat:LLVMTargetParser:LLVMTableGen:LLVMSupport:LLVMDemangle
 
diff --git a/etc/config/c.amazon.properties b/etc/config/c.amazon.properties
index 9ebc73468..7b971e572 100644
--- a/etc/config/c.amazon.properties
+++ b/etc/config/c.amazon.properties
@@ -260,7 +260,7 @@ compiler.cg127.exe=/opt/compiler-explorer/gcc-1.27/bin/gcc
 compiler.cg127.semver=1.27
 
 # Clang for x86
-group.cclang.compilers=cclang30:cclang31:cclang32:cclang33:cclang341:cclang350:cclang351:cclang352:cclang37x:cclang36x:cclang371:cclang380:cclang381:cclang390:cclang391:cclang400:cclang401:cclang500:cclang501:cclang502:cclang600:cclang601:cclang700:cclang701:cclang710:cclang800:cclang801:cclang900:cclang901:cclang1000:cclang1001:cclang1100:cclang1101:cclang1200:cclang1201:cclang1300:cclang1301:cclang1400:cclang1500:cclang1600:cclang1701:cclang1810:cclang1910:cclang2010:cclang_trunk:cclang_assertions_trunk:cclang_dang:cclang_widberg
+group.cclang.compilers=cclang30:cclang31:cclang32:cclang33:cclang341:cclang350:cclang351:cclang352:cclang37x:cclang36x:cclang371:cclang380:cclang381:cclang390:cclang391:cclang400:cclang401:cclang500:cclang501:cclang502:cclang600:cclang601:cclang700:cclang701:cclang710:cclang800:cclang801:cclang900:cclang901:cclang1000:cclang1001:cclang1100:cclang1101:cclang1200:cclang1201:cclang1300:cclang1301:cclang1400:cclang1500:cclang1600:cclang1701:cclang1810:cclang1910:cclang2010:cclang2110:cclang_trunk:cclang_assertions_trunk:cclang_dang:cclang_widberg
 group.cclang.intelAsm=-mllvm --x86-asm-syntax=intel
 group.cclang.options=--gcc-toolchain=/opt/compiler-explorer/gcc-7.2.0
 group.cclang.groupName=Clang x86-64
@@ -397,6 +397,9 @@ compiler.cclang1910.options=--gcc-toolchain=/opt/compiler-explorer/gcc-13.2.0
 compiler.cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.cclang2010.semver=20.1.0
 compiler.cclang2010.options=--gcc-toolchain=/opt/compiler-explorer/gcc-14.2.0
+compiler.cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.cclang2110.semver=21.1.0
+compiler.cclang2110.options=--gcc-toolchain=/opt/compiler-explorer/gcc-15.2.0
 
 compiler.cclang_trunk.exe=/opt/compiler-explorer/clang-trunk/bin/clang
 compiler.cclang_trunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
@@ -476,7 +479,7 @@ compiler.nvc_x86_25_7.semver=25.7
 # Clang for Arm
 # Provides 32- and 64-bit menu items for clang-9 and trunk
 group.armcclang32.groupName=Arm 32-bit clang
-group.armcclang32.compilers=armv7-cclang900:armv7-cclang901:armv7-cclang1000:armv7-cclang1001:armv7-cclang1100:armv7-cclang1101:armv7-cclang1200:armv7-cclang1201:armv7-cclang1300:armv7-cclang1301:armv7-cclang1400:armv7-cclang1500:armv7-cclang1600:armv7-cclang1701:armv7-cclang1810:armv7-cclang1910:armv7-cclang2010:armv7-cclang-trunk
+group.armcclang32.compilers=armv7-cclang900:armv7-cclang901:armv7-cclang1000:armv7-cclang1001:armv7-cclang1100:armv7-cclang1101:armv7-cclang1200:armv7-cclang1201:armv7-cclang1300:armv7-cclang1301:armv7-cclang1400:armv7-cclang1500:armv7-cclang1600:armv7-cclang1701:armv7-cclang1810:armv7-cclang1910:armv7-cclang2010:armv7-cclang2110:armv7-cclang-trunk
 group.armcclang32.isSemVer=true
 group.armcclang32.compilerType=clang
 group.armcclang32.supportsExecute=false
@@ -489,7 +492,7 @@ group.armcclang32.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 group.armcclang32.objdumper=/opt/compiler-explorer/arm/gcc-15.1.0/arm-unknown-linux-gnueabihf/bin/arm-unknown-linux-gnueabihf-objdump
 
 group.armcclang64.groupName=Arm 64-bit clang
-group.armcclang64.compilers=armv8-cclang900:armv8-cclang901:armv8-cclang1000:armv8-cclang1001:armv8-cclang1100:armv8-cclang1101:armv8-cclang1200:armv8-cclang1201:armv8-cclang1300:armv8-cclang1301:armv8-cclang1400:armv8-cclang1500:armv8-cclang1600:armv8-cclang1701:armv8-cclang1810:armv8-cclang1910:armv8-cclang2010:armv8-cclang-trunk:armv8-full-cclang-trunk
+group.armcclang64.compilers=armv8-cclang900:armv8-cclang901:armv8-cclang1000:armv8-cclang1001:armv8-cclang1100:armv8-cclang1101:armv8-cclang1200:armv8-cclang1201:armv8-cclang1300:armv8-cclang1301:armv8-cclang1400:armv8-cclang1500:armv8-cclang1600:armv8-cclang1701:armv8-cclang1810:armv8-cclang1910:armv8-cclang2010:armv8-cclang2110:armv8-cclang-trunk:armv8-full-cclang-trunk
 group.armcclang64.isSemVer=true
 group.armcclang64.compilerType=clang
 group.armcclang64.supportsExecute=false
@@ -501,6 +504,18 @@ group.armcclang64.compilerCategories=clang
 group.armcclang64.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 group.armcclang64.objdumper=/opt/compiler-explorer/arm64/gcc-15.1.0/aarch64-unknown-linux-gnu/bin/aarch64-unknown-linux-gnu-objdump
 
+compiler.armv7-cclang2110.name=armv7-a clang 21.1.0
+compiler.armv7-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.armv7-cclang2110.semver=21.1.0
+# Arm v7-a with Neon and VFPv3
+compiler.armv7-cclang2110.options=-target arm-linux-gnueabi --gcc-toolchain=/opt/compiler-explorer/arm/gcc-15.2.0/arm-unknown-linux-gnueabihf --sysroot=/opt/compiler-explorer/arm/gcc-15.2.0/arm-unknown-linux-gnueabihf/arm-unknown-linux-gnueabihf/sysroot
+
+compiler.armv8-cclang2110.name=armv8-a clang 21.1.0
+compiler.armv8-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.armv8-cclang2110.semver=21.1.0
+# Arm v8-a
+compiler.armv8-cclang2110.options=-target aarch64-linux-gnu --gcc-toolchain=/opt/compiler-explorer/arm64/gcc-15.2.0/aarch64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/arm64/gcc-15.2.0/aarch64-unknown-linux-gnu/aarch64-unknown-linux-gnu/sysroot
+
 compiler.armv7-cclang2010.name=armv7-a clang 20.1.0
 compiler.armv7-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.armv7-cclang2010.semver=20.1.0
@@ -808,7 +823,7 @@ group.rvcclang.licenseLink=https://github.com/llvm/llvm-project/blob/main/LICENS
 group.rvcclang.licensePreamble=The LLVM Project is under the Apache License v2.0 with LLVM Exceptions
 group.rvcclang.compilerCategories=clang
 
-group.rv32cclang.compilers=rv32-cclang:rv32-cclang2010:rv32-cclang1910:rv32-cclang1810:rv32-cclang1701:rv32-cclang1600:rv32-cclang1500:rv32-cclang1400:rv32-cclang1301:rv32-cclang1300:rv32-cclang1200:rv32-cclang1201:rv32-cclang1101:rv32-cclang1100:rv32-cclang1001:rv32-cclang1000:rv32-cclang901:rv32-cclang900
+group.rv32cclang.compilers=rv32-cclang:rv32-cclang2110:rv32-cclang2010:rv32-cclang1910:rv32-cclang1810:rv32-cclang1701:rv32-cclang1600:rv32-cclang1500:rv32-cclang1400:rv32-cclang1301:rv32-cclang1300:rv32-cclang1200:rv32-cclang1201:rv32-cclang1101:rv32-cclang1100:rv32-cclang1001:rv32-cclang1000:rv32-cclang901:rv32-cclang900
 group.rv32cclang.options=-target riscv32-unknown-elf -march=rv32gc -mabi=ilp32d --gcc-toolchain=/opt/compiler-explorer/riscv32/gcc-10.2.0/riscv32-unknown-elf
 group.rv32cclang.objdumper=/opt/compiler-explorer/riscv32/gcc-10.2.0/riscv32-unknown-elf/bin/riscv32-unknown-elf-objdump
 group.rv32cclang.baseName=RISC-V rv32gc clang
@@ -861,12 +876,14 @@ compiler.rv32-cclang1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/clang
 compiler.rv32-cclang1910.semver=19.1.0
 compiler.rv32-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.rv32-cclang2010.semver=20.1.0
+compiler.rv32-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.rv32-cclang2110.semver=21.1.0
 compiler.rv32-cclang.alias=rv32cclang
 compiler.rv32-cclang.exe=/opt/compiler-explorer/clang-trunk/bin/clang
 compiler.rv32-cclang.semver=(trunk)
 compiler.rv32-cclang.isNightly=true
 
-group.rv64cclang.compilers=rv64-cclang:rv64-cclang2010:rv64-cclang1910:rv64-cclang1810:rv64-cclang1701:rv64-cclang1600:rv64-cclang1500:rv64-cclang1400:rv64-cclang1301:rv64-cclang1300:rv64-cclang1200:rv64-cclang1201:rv64-cclang1101:rv64-cclang1100:rv64-cclang1001:rv64-cclang1000:rv64-cclang901:rv64-cclang900
+group.rv64cclang.compilers=rv64-cclang:rv64-cclang2110:rv64-cclang2010:rv64-cclang1910:rv64-cclang1810:rv64-cclang1701:rv64-cclang1600:rv64-cclang1500:rv64-cclang1400:rv64-cclang1301:rv64-cclang1300:rv64-cclang1200:rv64-cclang1201:rv64-cclang1101:rv64-cclang1100:rv64-cclang1001:rv64-cclang1000:rv64-cclang901:rv64-cclang900
 group.rv64cclang.options=-target riscv64-unknown-linux-gnu -march=rv64gc -mabi=lp64d --gcc-toolchain=/opt/compiler-explorer/riscv64/gcc-8.2.0/riscv64-unknown-linux-gnu --sysroot=/opt/compiler-explorer/riscv64/gcc-8.2.0/riscv64-unknown-linux-gnu/riscv64-unknown-linux-gnu/sysroot
 group.rv64cclang.objdumper=/opt/compiler-explorer/riscv64/gcc-8.2.0/riscv64-unknown-linux-gnu/bin/riscv64-unknown-linux-gnu-objdump
 group.rv64cclang.baseName=RISC-V rv64gc clang
@@ -916,6 +933,8 @@ compiler.rv64-cclang1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/clang
 compiler.rv64-cclang1910.semver=19.1.0
 compiler.rv64-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.rv64-cclang2010.semver=20.1.0
+compiler.rv64-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.rv64-cclang2110.semver=21.1.0
 compiler.rv64-cclang.alias=rv64cclang
 compiler.rv64-cclang.exe=/opt/compiler-explorer/clang-trunk/bin/clang
 compiler.rv64-cclang.semver=(trunk)
@@ -1152,7 +1171,7 @@ group.cbpf.compilers=&cgccbpf:&cclangbpf
 group.cbpf.demangler=/opt/compiler-explorer/bpf/gcc-trunk/bpf-unknown-none/bin/bpf-unknown-none-c++filt
 
 # Clang for BPF
-group.cclangbpf.compilers=cbpfclangtrunk:cbpfclang2010:cbpfclang1910:cbpfclang1810:cbpfclang1701:cbpfclang1600:cbpfclang1500:cbpfclang1400:cbpfclang1300
+group.cclangbpf.compilers=cbpfclangtrunk:cbpfclang2110:cbpfclang2010:cbpfclang1910:cbpfclang1810:cbpfclang1701:cbpfclang1600:cbpfclang1500:cbpfclang1400:cbpfclang1300
 group.cclangbpf.supportsBinary=false
 group.cclangbpf.supportsExecute=false
 group.cclangbpf.baseName=BPF clang
@@ -1168,6 +1187,9 @@ compiler.cbpfclangtrunk.exe=/opt/compiler-explorer/clang-trunk/bin/clang
 compiler.cbpfclangtrunk.semver=(trunk)
 compiler.cbpfclangtrunk.isNightly=true
 
+compiler.cbpfclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.cbpfclang2110.semver=21.1.0
+
 compiler.cbpfclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.cbpfclang2010.semver=20.1.0
 
@@ -2949,7 +2971,7 @@ group.cmipss.supportsExecute=false
 # Clang for all MIPS
 
 ## MIPS
-group.mips-cclang.compilers=mips-cclang2010:mips-cclang1910:mips-cclang1810:mips-cclang1701:mips-cclang1600:mips-cclang1500:mips-cclang1400:mips-cclang1300
+group.mips-cclang.compilers=mips-cclang2110:mips-cclang2010:mips-cclang1910:mips-cclang1810:mips-cclang1701:mips-cclang1600:mips-cclang1500:mips-cclang1400:mips-cclang1300
 group.mips-cclang.instructionSet=mips
 group.mips-cclang.groupName=MIPS clang
 group.mips-cclang.baseName=mips clang
@@ -2960,6 +2982,9 @@ group.mips-cclang.options=-target mips-elf
 group.mips-cclang.compilerCategories=clang
 group.mips-cclang.compilerCategories.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.mips-cclang2110.semver=21.1.0
+
 compiler.mips-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.mips-cclang2010.semver=20.1.0
 
@@ -2985,7 +3010,7 @@ compiler.mips-cclang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang
 compiler.mips-cclang1300.semver=13.0.0
 
 ## MIPSEL
-group.mipsel-cclang.compilers=mipsel-cclang2010:mipsel-cclang1910:mipsel-cclang1810:mipsel-cclang1701:mipsel-cclang1600:mipsel-cclang1500:mipsel-cclang1400:mipsel-cclang1300
+group.mipsel-cclang.compilers=mipsel-cclang2110:mipsel-cclang2010:mipsel-cclang1910:mipsel-cclang1810:mipsel-cclang1701:mipsel-cclang1600:mipsel-cclang1500:mipsel-cclang1400:mipsel-cclang1300
 group.mipsel-cclang.instructionSet=mips
 group.mipsel-cclang.groupName=MIPSEL clang
 group.mipsel-cclang.baseName=mipsel clang
@@ -2996,6 +3021,9 @@ group.mipsel-cclang.options=-target mipsel-elf
 group.mipsel-cclang.compilerCategories=clang
 group.mipsel-cclang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mipsel-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.mipsel-cclang2110.semver=21.1.0
+
 compiler.mipsel-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.mipsel-cclang2010.semver=20.1.0
 
@@ -3021,7 +3049,7 @@ compiler.mipsel-cclang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang
 compiler.mipsel-cclang1300.semver=13.0.0
 
 ## MIPS64
-group.mips64-cclang.compilers=mips64-cclang2010:mips64-cclang1910:mips64-cclang1810:mips64-cclang1701:mips64-cclang1600:mips64-cclang1500:mips64-cclang1400:mips64-cclang1300
+group.mips64-cclang.compilers=mips64-cclang2110:mips64-cclang2010:mips64-cclang1910:mips64-cclang1810:mips64-cclang1701:mips64-cclang1600:mips64-cclang1500:mips64-cclang1400:mips64-cclang1300
 group.mips64-cclang.groupName=MIPS64 clang
 group.mips64-cclang.instructionSet=mips
 group.mips64-cclang.baseName=mips64 clang
@@ -3032,6 +3060,9 @@ group.mips64-cclang.options=-target mips64-elf
 group.mips64-cclang.compilerCategories=clang
 group.mips64-cclang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips64-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.mips64-cclang2110.semver=21.1.0
+
 compiler.mips64-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.mips64-cclang2010.semver=20.1.0
 
@@ -3057,7 +3088,7 @@ compiler.mips64-cclang1300.exe=/opt/compiler-explorer/clang-13.0.0/bin/clang
 compiler.mips64-cclang1300.semver=13.0.0
 
 ## MIPS64EL
-group.mips64el-cclang.compilers=mips64el-cclang2010:mips64el-cclang1910:mips64el-cclang1810:mips64el-cclang1701:mips64el-cclang1600:mips64el-cclang1500:mips64el-cclang1400:mips64el-cclang1300
+group.mips64el-cclang.compilers=mips64el-cclang2110:mips64el-cclang2010:mips64el-cclang1910:mips64el-cclang1810:mips64el-cclang1701:mips64el-cclang1600:mips64el-cclang1500:mips64el-cclang1400:mips64el-cclang1300
 group.mips64el-cclang.groupName=MIPS64EL clang
 group.mips64el-cclang.instructionSet=mips
 group.mips64el-cclang.baseName=mips64el clang
@@ -3068,6 +3099,9 @@ group.mips64el-cclang.options=-target mips64el-elf
 group.mips64el-cclang.compilerCategories=clang
 group.mips64el-cclang.demangler=/opt/compiler-explorer/clang-trunk/bin/llvm-cxxfilt
 
+compiler.mips64el-cclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang
+compiler.mips64el-cclang2110.semver=21.1.0
+
 compiler.mips64el-cclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang
 compiler.mips64el-cclang2010.semver=20.1.0
 
diff --git a/etc/config/llvm.amazon.properties b/etc/config/llvm.amazon.properties
index fa756dea8..655719a6a 100644
--- a/etc/config/llvm.amazon.properties
+++ b/etc/config/llvm.amazon.properties
@@ -8,7 +8,7 @@ licenseName=LLVM Apache 2
 licenseLink=https://github.com/llvm/llvm-project/blob/main/LICENSE.TXT
 licensePreamble=The LLVM Project is under the Apache License v2.0 with LLVM Exceptions
 
-group.irclang.compilers=irclang401:irclang500:irclang600:irclang700:irclang800:irclang900:irclang1000:irclang1001:irclang1100:irclang1101:irclang1200:irclang1201:irclang1300:irclang1400:irclang1500:irclang1600:irclang1701:irclang1810:irclang1910:irclang2010:irclangtrunk:irclang-assertions-trunk
+group.irclang.compilers=irclang401:irclang500:irclang600:irclang700:irclang800:irclang900:irclang1000:irclang1001:irclang1100:irclang1101:irclang1200:irclang1201:irclang1300:irclang1400:irclang1500:irclang1600:irclang1701:irclang1810:irclang1910:irclang2010:irclang2110:irclangtrunk:irclang-assertions-trunk
 group.irclang.intelAsm=-masm=intel
 group.irclang.groupName=Clang x86-64
 group.irclang.options=-x ir
@@ -56,6 +56,8 @@ compiler.irclang1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/clang++
 compiler.irclang1910.semver=19.1.0
 compiler.irclang2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/clang++
 compiler.irclang2010.semver=20.1.0
+compiler.irclang2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/clang++
+compiler.irclang2110.semver=21.1.0
 compiler.irclangtrunk.exe=/opt/compiler-explorer/clang-trunk/bin/clang++
 compiler.irclangtrunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.irclangtrunk.semver=(trunk)
@@ -75,7 +77,7 @@ compiler.irhexagonclang1605.exe=/opt/compiler-explorer/clang+llvm-16.0.5-cross-h
 compiler.irhexagonclang1605.compilerType=clang-hexagon
 compiler.irhexagonclang1605.compilerCategories=clang-hexagon
 
-group.llc.compilers=llc32:llc33:llc391:llc400:llc401:llc500:llc600:llc700:llc800:llc900:llc1000:llc1001:llc1100:llc1101:llc1200:llc1201:llc1300:llc1400:llc1500:llc1600:llc1701:llc1810:llc1910:llc2010:llctrunk:llc-assertions-trunk
+group.llc.compilers=llc32:llc33:llc391:llc400:llc401:llc500:llc600:llc700:llc800:llc900:llc1000:llc1001:llc1100:llc1101:llc1200:llc1201:llc1300:llc1400:llc1500:llc1600:llc1701:llc1810:llc1910:llc2010:llc2110:llctrunk:llc-assertions-trunk
 group.llc.compilerType=llc
 group.llc.supportsExecute=false
 group.llc.intelAsm=-masm=intel
@@ -132,6 +134,8 @@ compiler.llc1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/llc
 compiler.llc1910.semver=19.1.0
 compiler.llc2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/llc
 compiler.llc2010.semver=20.1.0
+compiler.llc2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/llc
+compiler.llc2110.semver=21.1.0
 compiler.llctrunk.exe=/opt/compiler-explorer/clang-trunk/bin/llc
 compiler.llctrunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.llctrunk.semver=(trunk)
@@ -139,7 +143,7 @@ compiler.llc-assertions-trunk.exe=/opt/compiler-explorer/clang-assertions-trunk/
 compiler.llc-assertions-trunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.llc-assertions-trunk.semver=(assertions trunk)
 
-group.opt.compilers=opt32:opt33:opt391:opt400:opt401:opt500:opt600:opt700:opt800:opt900:opt1000:opt1001:opt1100:opt1101:opt1200:opt1201:opt1300:opt1400:opt1500:opt1600:opt1701:opt1810:opt1910:opt2010:opttrunk:opt-assertions-trunk
+group.opt.compilers=opt32:opt33:opt391:opt400:opt401:opt500:opt600:opt700:opt800:opt900:opt1000:opt1001:opt1100:opt1101:opt1200:opt1201:opt1300:opt1400:opt1500:opt1600:opt1701:opt1810:opt1910:opt2010:opt2110:opttrunk:opt-assertions-trunk
 group.opt.compilerType=opt
 group.opt.supportsBinary=false
 group.opt.supportsExecute=false
@@ -198,6 +202,8 @@ compiler.opt1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/opt
 compiler.opt1910.semver=19.1.0
 compiler.opt2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/opt
 compiler.opt2010.semver=20.1.0
+compiler.opt2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/opt
+compiler.opt2110.semver=21.1.0
 compiler.opttrunk.exe=/opt/compiler-explorer/clang-trunk/bin/opt
 compiler.opttrunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
 compiler.opttrunk.semver=(trunk)
diff --git a/etc/config/llvm_mir.amazon.properties b/etc/config/llvm_mir.amazon.properties
index d8753b2fc..b0d52a0e5 100644
--- a/etc/config/llvm_mir.amazon.properties
+++ b/etc/config/llvm_mir.amazon.properties
@@ -8,7 +8,7 @@ licenseName=LLVM Apache 2
 licenseLink=https://github.com/llvm/llvm-project/blob/main/LICENSE.TXT
 licensePreamble=The LLVM Project is under the Apache License v2.0 with LLVM Exceptions
 
-group.mirllc.compilers=mirllc32:mirllc33:mirllc391:mirllc400:mirllc401:mirllc500:mirllc600:mirllc700:mirllc800:mirllc900:mirllc1000:mirllc1001:mirllc1100:mirllc1101:mirllc1200:mirllc1201:mirllc1300:mirllc1400:mirllc1500:mirllc1600:mirllc1701:mirllc1810:mirllc1910:mirllc2010:mirllctrunk:mirllc-assertions-trunk
+group.mirllc.compilers=mirllc32:mirllc33:mirllc391:mirllc400:mirllc401:mirllc500:mirllc600:mirllc700:mirllc800:mirllc900:mirllc1000:mirllc1001:mirllc1100:mirllc1101:mirllc1200:mirllc1201:mirllc1300:mirllc1400:mirllc1500:mirllc1600:mirllc1701:mirllc1810:mirllc1910:mirllc2010:mirllc2110:mirllctrunk:mirllc-assertions-trunk
 group.mirllc.compilerType=llc
 group.mirllc.supportsExecute=false
 group.mirllc.intelAsm=-masm=intel
@@ -65,6 +65,8 @@ compiler.mirllc1910.exe=/opt/compiler-explorer/clang-19.1.0/bin/llc
 compiler.mirllc1910.semver=19.1.0
 compiler.mirllc2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/llc
 compiler.mirllc2010.semver=20.1.0
+compiler.mirllc2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/llc
+compiler.mirllc2110.semver=21.1.0
 compiler.mirllctrunk.exe=/opt/compiler-explorer/clang-trunk/bin/llc
 compiler.mirllctrunk.demangler=/opt/compiler-explorer/gcc-snapshot/bin/c++filt
 compiler.mirllctrunk.objdumper=/opt/compiler-explorer/gcc-snapshot/bin/objdump
diff --git a/etc/config/tablegen.amazon.properties b/etc/config/tablegen.amazon.properties
index b15e6e500..668f61c25 100644
--- a/etc/config/tablegen.amazon.properties
+++ b/etc/config/tablegen.amazon.properties
@@ -4,7 +4,7 @@ compilerType=tablegen
 supportsBinary=false
 supportsExecute=false
 
-group.llvmtblgen.compilers=llvmtblgen_trunk:llvmtblgen1701:llvmtblgen1810:llvmtblgen1910:llvmtblgen2010
+group.llvmtblgen.compilers=llvmtblgen_trunk:llvmtblgen1701:llvmtblgen1810:llvmtblgen1910:llvmtblgen2010:llvmtblgen2110
 group.llvmtblgen.groupName=LLVM TableGen
 group.llvmtblgen.baseName=LLVM TableGen
 group.llvmtblgen.isSemVer=true
@@ -36,3 +36,7 @@ compiler.llvmtblgen1910.includePath=/opt/compiler-explorer/clang-19.1.0/include/
 compiler.llvmtblgen2010.exe=/opt/compiler-explorer/clang-20.1.0/bin/llvm-tblgen
 compiler.llvmtblgen2010.semver=20.1.0
 compiler.llvmtblgen2010.includePath=/opt/compiler-explorer/clang-20.1.0/include/
+
+compiler.llvmtblgen2110.exe=/opt/compiler-explorer/clang-21.1.0/bin/llvm-tblgen
+compiler.llvmtblgen2110.semver=21.1.0
+compiler.llvmtblgen2110.includePath=/opt/compiler-explorer/clang-21.1.0/include/