https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62077
--- Comment #49 from Sven C. Dack <sven.c.dack at virginmedia dot com> --- The problem seems to be a missing liblto_plugin.so in gcc's directory for stage2. I used: --with-boot-ldflags="-static -flto=1 -flto-partition=none -fuse-linker-plugin" together with: --enable-linker-plugin-flags="-pipe -O2 -march=native -fomit-frame-pointer -fno-builtin-memcmp" to avoid the "-static" option from being passed onto the plugin, but it fails. During stage1 does it still work and builds liblto_plugin.so as follows: ... /bin/bash ./libtool --tag=CC --tag=disable-static --mode=compile gcc -DHAVE_CONFIG_H -I. -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin lto-plugin -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin ../include -DHAVE_CONFIG_H -Wall -g -c -o lto-plugin.lo /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/lto-plugin.c libtool: compile: gcc -DHAVE_CONFIG_H -I. -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/../include -DHAVE_CONFIG_H -Wall -g -c /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/lto-plugin.c -fPIC -DPIC -o .libs/lto-plugin.o /bin/bash ./libtool --tag=CC --tag=disable-static --mode=link gcc -Wall -g -Wc,-static-libgcc -module -bindir /home/sven/gcc-lto-plugin/libexec/gcc/x86_64-unknown-linux-gnu/4.9.2 -static-libstdc++ -static-libgcc -pipe -O2 -march=native -fomit-frame-pointer -fno-builtin-memcmp -o liblto_plugin.la -rpath /home/sven/gcc-lto-plugin/libexec/gcc/x86_64-unknown-linux-gnu/4.9.2 lto-plugin.lo -Wc,../libiberty/pic/libiberty.a libtool: link: gcc -shared .libs/lto-plugin.o -static-libgcc -march=native ../libiberty/pic/libiberty.a -Wl,-soname -Wl,liblto_plugin.so.0 -o .libs/liblto_plugin.so.0.0.0 libtool: link: (cd ".libs" && rm -f "liblto_plugin.so.0" && ln -s "liblto_plugin.so.0.0.0" "liblto_plugin.so.0") libtool: link: (cd ".libs" && rm -f "liblto_plugin.so" && ln -s "liblto_plugin.so.0.0.0" "liblto_plugin.so") libtool: link: ( cd ".libs" && rm -f "liblto_plugin.la" && ln -s "../liblto_plugin.la" "liblto_plugin.la" ) ... This leads to stage1 having a working plugin. For stage2 does it change: /bin/bash ./libtool --tag=CC --tag=disable-static --mode=compile /var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/xgcc -B/var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/lib/ -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/include -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/sys-include -DHAVE_CONFIG_H -I. -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/../include -DHAVE_CONFIG_H -Wall -g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -c -o lto-plugin.lo /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/lto-plugin.c ... This already looks wrong. Although it has removed "-static" from the options is it actually using those I have given with --with-boot-ldflags="..." and it is not using those given with --enable-linker-plugin-flags="...". It continues with: libtool: compile: /var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/xgcc -B/var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/lib/ -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/include -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/sys-include -DHAVE_CONFIG_H -I. -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin -I/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/../include -DHAVE_CONFIG_H -Wall -g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -c /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/lto-plugin.c -fPIC -DPIC -o .libs/lto-plugin.o # (line B) /bin/bash ./libtool --tag=CC --tag=disable-static --mode=link /var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/xgcc -B/var/tmp/build-pkg-32413/obj/gcc-4.9-lto-plugin/./prev-gcc/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/bin/ -B/home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/lib/ -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/include -isystem /home/sven/gcc-lto-plugin/x86_64-unknown-linux-gnu/sys-include -Wall -g -O2 -flto=jobserver -frandom-seed=1 -ffat-lto-objects -Wc,-static-libgcc -module -bindir /home/sven/gcc-lto-plugin/libexec/gcc/x86_64-unknown-linux-gnu/4.9.2 -static -flto=1 -flto-partition=none -fuse-linker-plugin -o liblto_plugin.la -rpath /home/sven/gcc-lto-plugin/libexec/gcc/x86_64-unknown-linux-gnu/4.9.2 lto-plugin.lo -Wc,../libiberty/pic/libiberty.a libtool: link: ar rc .libs/liblto_plugin.a .libs/lto-plugin.o libtool: link: ranlib .libs/liblto_plugin.a libtool: link: ( cd ".libs" && rm -f "liblto_plugin.la" && ln -s "../liblto_plugin.la" "liblto_plugin.la" ) WARNING: liblto_plugin.la is static, not copying to .././gcc/liblto_plugin.la Why is it not using the options given with --enable-linker-plugin-flags for the 2nd stage? config.log for stage1 and stage2 both show that --enable-linker-plugin-flags has been passed to configure: $ head -7 stage1-lto-plugin/config.log This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by LTO plugin for ld configure 0.1, which was generated by GNU Autoconf 2.64. Invocation command line was $ /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/configure --cache-file=./config.cache --prefix=/home/sven/gcc-lto-plugin --with-gmp=/home/sven/gcc-lto-plugin --with-mpfr=/home/sven/gcc-lto-plugin --with-mpc=/home/sven/gcc-lto-plugin --enable-stage1-languages=c,lto --enable-multiarch --with-arch=native --enable-checking=yes --enable-stage1-checking=yes --enable-linker-build-id --with-linker-hash-style=gnu --enable-lto --with-build-config=bootstrap-lto --enable-link-mutex --enable-linker-plugin-flags=-pipe -O2 -march=native -fomit-frame-pointer -fno-builtin-memcmp --with-boot-ldflags=-static -flto=1 -flto-partition=none -fuse-linker-plugin --enable-languages=c,c++,lto --program-transform-name=s,y,y, --disable-option-checking --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --srcdir=/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin --disable-intermodule --enable-checking=yes --disable-coverage --enable-languages=c,c++,lto --disable-build-format-warnings --enable-shared $ head -7 prev-lto-plugin/config.log This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by LTO plugin for ld configure 0.1, which was generated by GNU Autoconf 2.64. Invocation command line was $ /var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin/configure --cache-file=./config.cache --prefix=/home/sven/gcc-lto-plugin --with-gmp=/home/sven/gcc-lto-plugin --with-mpfr=/home/sven/gcc-lto-plugin --with-mpc=/home/sven/gcc-lto-plugin --enable-stage1-languages=c,lto --enable-multiarch --with-arch=native --enable-checking=yes --enable-stage1-checking=yes --enable-linker-build-id --with-linker-hash-style=gnu --enable-lto --with-build-config=bootstrap-lto --enable-link-mutex --enable-linker-plugin-flags=-pipe -O2 -march=native -fomit-frame-pointer -fno-builtin-memcmp --with-boot-ldflags=-static -flto=1 -flto-partition=none -fuse-linker-plugin --enable-languages=c,c++,lto --program-transform-name=s,y,y, --disable-option-checking --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=x86_64-unknown-linux-gnu --srcdir=/var/tmp/build-pkg-32413/src/gcc-4.9-lto-plugin/lto-plugin --with-build-libsubdir=. --enable-shared
