diff options
Diffstat (limited to 'chapter06/gcc-pass2.xml')
| -rw-r--r-- | chapter06/gcc-pass2.xml | 56 |
1 files changed, 42 insertions, 14 deletions
diff --git a/chapter06/gcc-pass2.xml b/chapter06/gcc-pass2.xml index bf3007848..d76b9d9af 100644 --- a/chapter06/gcc-pass2.xml +++ b/chapter06/gcc-pass2.xml @@ -62,23 +62,24 @@ mv -v mpc-&mpc-version; mpc</userinput></screen> sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64 ;; esac</userinput></screen> -<!-- - <para>Fix an issue with GCC-10.1 when building with a cross - compiler:</para> -<screen><userinput remap="pre">patch -Np1 -i ../&gcc-cross-patch;</userinput></screen> ---> + <!-- https://gcc.gnu.org/PR100017 --> + <para>Fix an issue causing failure cross-compiling libstdc++:</para> + +<screen><userinput remap="pre">sed 's/gnu++17/& -nostdinc++/' \ + -i libstdc++-v3/src/c++17/Makefile.in</userinput></screen> + + <para>Override the building rule of 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 cd build</userinput></screen> - <para>Create a symlink that allows libgcc to be built with posix threads - support:</para> - -<screen><userinput remap="pre">mkdir -pv $LFS_TGT/libgcc -ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></screen> - <para>Before starting to build GCC, remember to unset any environment variables that override the default optimization flags.</para> @@ -87,8 +88,9 @@ ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></s <screen><userinput remap="configure">../configure \ --build=$(../config.guess) \ --host=$LFS_TGT \ + --target=$LFS_TGT \ + LDFLAGS_FOR_TARGET=-L$PWD/$LFS_TGT/libgcc \ --prefix=/usr \ - CC_FOR_TARGET=$LFS_TGT-gcc \ --with-build-sysroot=$LFS \ --enable-initfini-array \ --disable-nls \ @@ -99,14 +101,13 @@ ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></s --disable-libquadmath \ --disable-libssp \ --disable-libvtv \ - --disable-libstdcxx \ --enable-languages=c,c++</userinput></screen> <variablelist> <title>The meaning of the new configure options:</title><!-- WIP --> <varlistentry> - <term><parameter>-with-build-sysroot=$LFS</parameter></term> + <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 @@ -119,6 +120,33 @@ ln -s ../../../libgcc/gthr-posix.h $LFS_TGT/libgcc/gthr-default.h</userinput></s </varlistentry> <varlistentry> + <term><parameter>--target=$LFS_TGT</parameter></term> + <listitem> + <para>As we are cross-compiling GCC, it's impossible to build + target libraries (<filename class="libraryfile">libgcc</filename> + and <filename class="libraryfile">libstdc++</filename>) with the + compiled GCC binaries because these binaries won't run on the + host distro. GCC building system will attempt to use the + C and C++ compilers on the host distro as a workaround by default. + It's not supported to build GCC target libraries with a different + version of GCC, so using host compilers may cause building + failure. This parameter ensures to build the libraries with GCC + pass 1 and prevent the issue.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><parameter>LDFLAGS_FOR_TARGET=...</parameter></term> + <listitem> + <para>Allow <filename class="libraryfile">libstdc++</filename> to + use shared <filename class="libraryfile">libgcc</filename> being + built in this pass, instead of the static version built in GCC + pass 1. This is needed for supporting C++ exception + handling.</para> + </listitem> + </varlistentry> + + <varlistentry> <term><parameter>--enable-initfini-array</parameter></term> <listitem> <para>This option is automatically enabled when building a native |