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kselftest/arm64: Support build of MTE tests with clang

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The assembly portions of the MTE selftests need to be built with a
toolchain supporting MTE.  Since we support GCC versions that lack MTE
support we have logic to suppress build of these tests when using such a
toolchain but that logic is broken for LLVM=1 builds, it uses CC but CC
is only set for LLVM builds in libs.mk which needs to be included after
we have selected which test programs to build.

Since all supported LLVM versions support MTE we can simply assume MTE
support when LLVM is set.  This is not a thing of beauty but it does the
job.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Link: https://lore.kernel.org/r/20230111-arm64-kselftest-clang-v1-5-89c69d377727@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown
2023-01-12 19:51:51 +00:00
committed by Catalin Marinas
parent 6e4b4f0eca
commit 343d59119e
1 changed files with 15 additions and 5 deletions
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20
tools/testing/selftests/arm64/mte/Makefile
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@@ -1,19 +1,29 @@
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2020 ARM Limited
# preserve CC value from top level Makefile
ifeq ($(CC),cc)
CC := $(CROSS_COMPILE)gcc
endif
CFLAGS += -std=gnu99 -I. -pthread
LDFLAGS += -pthread
SRCS := $(filter-out mte_common_util.c,$(wildcard *.c))
PROGS := $(patsubst %.c,%,$(SRCS))
ifeq ($(LLVM),)
# For GCC check that the toolchain has MTE support.
# preserve CC value from top level Makefile
ifeq ($(CC),cc)
CC := $(CROSS_COMPILE)gcc
endif
#check if the compiler works well
mte_cc_support := $(shell if ($(CC) $(CFLAGS) -march=armv8.5-a+memtag -E -x c /dev/null -o /dev/null 2>&1) then echo "1"; fi)
else
# All supported clang versions also support MTE.
mte_cc_support := 1
endif
ifeq ($(mte_cc_support),1)
# Generated binaries to be installed by top KSFT script
TEST_GEN_PROGS := $(PROGS)