mirrors/lfs
2
0
Fork 0
mirror of https://git.linuxfromscratch.org/lfs.git synced 2026-07-22 02:26:48 -04:00
Code Issues Packages Projects Releases Wiki Activity

gcc-pass2: use the build system machinery to enable thread instead of hacking it

Browse Source 
Also reorder the explanations to match the order of switches in the
instruction.
This commit is contained in:
Xi Ruoyao
2026-06-02 00:04:10 +08:00
parent 840726a09a
commit de4fbf0adf
1 changed files with 32 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
chapter06/gcc-pass2.xml
View File

@@ -63,12 +63,6 @@ mv -v mpc-&mpc-version; mpc</userinput></screen>
;;
esac</userinput></screen>
<para>Override the build rules of the libgcc and libstdc++ headers to
allow building these libraries with POSIX threads support:</para>
<screen><userinput remap="pre">sed '/thread_header =/s/@.*@/gthr-posix.h/' \
-i libgcc/Makefile.in libstdc++-v3/include/Makefile.in</userinput></screen>
<para>Create a separate build directory again:</para>
<screen><userinput remap="pre">mkdir -v build
@@ -96,24 +90,12 @@ cd build</userinput></screen>
--disable-libssp \
--disable-libvtv \
--enable-languages=c,c++ \
LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc</userinput></screen>
LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc \
target_configargs=gcc_cv_target_thread_file=posix</userinput></screen>
<variablelist>
<title>The meaning of the new configure options:</title><!-- WIP -->
<varlistentry>
<term><parameter>--with-build-sysroot=$LFS</parameter></term>
<listitem>
<para>Normally, using <parameter>--host</parameter> ensures that
a cross-compiler is used for building GCC, and that compiler knows
that it has to look for headers and libraries in <filename
class="directory">$LFS</filename>. However, the build system for GCC
uses additional tools which are not aware of this location. This
switch is needed so those tools will find the needed files in
<filename class="directory">$LFS</filename>, and not on the host.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--target=$LFS_TGT</parameter></term>
<listitem>
@@ -130,6 +112,30 @@ cd build</userinput></screen>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--with-build-sysroot=$LFS</parameter></term>
<listitem>
<para>Normally, using <parameter>--host</parameter> ensures that
a cross-compiler is used for building GCC, and that compiler knows
that it has to look for headers and libraries in <filename
class="directory">$LFS</filename>. However, the build system for GCC
uses additional tools which are not aware of this location. This
switch is needed so those tools will find the needed files in
<filename class="directory">$LFS</filename>, and not on the host.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>--disable-libsanitizer</parameter></term>
<listitem>
<para>Disable GCC sanitizer runtime libraries. They are not
needed for the temporary installation. In
<xref linkend='ch-tools-gcc-pass1'/> it was implied by
<parameter>--disable-libstdcxx</parameter>, and now we can
explicitly pass it.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>LDFLAGS_FOR_TARGET=...</parameter></term>
<listitem>
@@ -143,13 +149,13 @@ cd build</userinput></screen>
</varlistentry>
<varlistentry>
<term><parameter>--disable-libsanitizer</parameter></term>
<term><parameter>target_configargs=gcc_cv_target_thread_file=posix</parameter></term>
<listitem>
<para>Disable GCC sanitizer runtime libraries. They are not
needed for the temporary installation. In
<xref linkend='ch-tools-gcc-pass1'/> it was implied by
<parameter>--disable-libstdcxx</parameter>, and now we can
explicitly pass it.</para>
<para>Build the target libraries libgcc and libstdc++ with POSIX
thread support enabled. The default is following the
configuration of the compiler used for building the target library
(in this case, <xref linkend='ch-tools-gcc-pass1'/> which was
configured with none thread support).</para>
</listitem>
</varlistentry>