Hello, I am trying to build GCC 4.8.5 from source on Fedora 25 ( GCC 6.2 ). The only patch I am using beyond vanilla source is gcc-4.9-fix-build-with-gcc-6.patch designed to fix issues with libc_name_p. Building fails early and complains about libstdc++ support for components built against Fedora 25 libstdcc++ and then run on libstdcc++ from the bootstrap ( CXXABI not found ). # #I fail early at during the stage1 target. # checking how to run the C preprocessor... (cached) /home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -E configure: error: in `/home/msellers/Downloads/gcc-4.8.5/x86_64-unknown-linux-gnu/libgcc': configure: error: C preprocessor "/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -E" fails sanity check See `config.log' for more details. Makefile:15291: recipe for target 'configure-stage1-target-libgcc' failed make[2]: *** [configure-stage1-target-libgcc] Error 1 make[2]: Leaving directory '/home/msellers/Downloads/gcc-4.8.5' Makefile:19438: recipe for target 'stage1-bubble' failed make[1]: *** [stage1-bubble] Error 2 make[1]: Leaving directory '/home/msellers/Downloads/gcc-4.8.5' Makefile:885: recipe for target 'all' failed make: *** [all] Error 2 #It seems that early bootstrap components are being linked against Fedora 25's ( 6.2 ) libstdcc++ during build and executed with ( 4.8.5 ) during successive compliation. # # from config.log: configure:3923: /home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -E conftest.c /home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/cc1: /home/msellers/Downloads/gcc-4.8.5/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6: version `CXXABI_1.3.9' not found (required by /home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/cc1) configure:3923: $? = 1 configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "GNU C Runtime Library" | #define PACKAGE_TARNAME "libgcc" | #define PACKAGE_VERSION "1.0" | #define PACKAGE_STRING "GNU C Runtime Library 1.0" | #define PACKAGE_BUGREPORT "" | #define PACKAGE_URL "http://www.gnu.org/software/libgcc/"; | /* end confdefs.h. */ | #ifdef __STDC__ | # include <limits.h> | #else | # include <assert.h> | #endif | Syntax error configure:3953: error: in `/home/msellers/Downloads/gcc-4.8.5/x86_64-unknown-linux-gnu/libgcc': configure:3956: error: C preprocessor "/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/xgcc -B/home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/ -B/usr/local/x86_64-unknown-linux-gnu/bin/ -B/usr/local/x86_64-unknown-linux-gnu/lib/ -isystem /usr/local/x86_64-unknown-linux-gnu/include -isystem /usr/local/x86_64-unknown-linux-gnu/sys-include -E" fails sanity check See `config.log' for more details. # # cc1 is built against Fedora25 libstdc++ which causes above error. # msellers@msellers ~/Downloads/gcc-4.8.5 $ strings /home/msellers/Downloads/gcc-4.8.5/host-x86_64-unknown-linux-gnu/gcc/cc1 | grep CXXABI CXXABI_1.3.9 CXXABI_1.3 ## cc1 is executed during build with libstdc++ built during early bootstrap -- and fails. msellers@msellers ~/Downloads/gcc-4.8.5 $ strings /home/msellers/Downloads/gcc-4.8.5/x86_64-unknown-linux-gnu/libstdc++-v3/src/.libs/libstdc++.so.6 | grep CXXABI CXXABI_1.3 CXXABI_1.3.1 CXXABI_1.3.2 CXXABI_1.3.3 CXXABI_1.3.4 CXXABI_1.3.5 CXXABI_1.3.6 CXXABI_1.3.7 CXXABI_TM_1 CXXABI_1.3 CXXABI_1.3.2 CXXABI_1.3.6 CXXABI_1.3.1 CXXABI_1.3.5 CXXABI_1.3.4 CXXABI_TM_1 CXXABI_1.3.7 CXXABI_1.3.3 Is this the expected result of building an older GCC release with a new one? Is the libstdc++ support gap too wide? Im having trouble finding advice from other sources --- I appreciate any insight. Thanks, Matt
