Jonathan Wakely 于2018年7月31日周二 下午4:37写道：
>
> On Tue, 31 Jul 2018 at 07:25, martin krastev wrote:
> >
> > Hello,
> >
> > I'm trying to build gcc-7.3.0 (md5 747d5010b7c6938b480bc6e4d7c4be9a of
> > tar.gz) natively on a MACHTYPE=mipsel-unknown-linux-gnu MIPS p5600 machine
> > under Debian Stretch. I'm getting an illegal instruction during libstdc++
> > build phase:
>
> This mailing list is for discussion of GCC development, not help using
> or building GCC. Your mail would be appropriate on the gcc-help list,
> which I've CC'd. Please remove gcc@ from further replies and use the
> gcc-help@ list.
>
> > libtool: compile: /home/gru/proj/gcc_build/./gcc/xgcc -shared-libgcc
> > -B/home/gru/proj/gcc_build/./gcc -nostdinc++
> > -L/home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/src
> > -L/home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/src/.libs
> > -L/home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/libsupc++/.libs
> > -B/usr/local/mipsel-linux-gnu/bin/ -B/usr/local/mipsel-linux-gnu/lib/
> > -isystem /usr/local/mipsel-linux-gnu/include -isystem
> > /usr/local/mipsel-linux-gnu/sys-include
> > -I/home/gru/proj/gcc-7.3.0/libstdc++-v3/../libgcc
> > -I/home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/mipsel-linux-gnu
> > -I/home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include
> > -I/home/gru/proj/gcc-7.3.0/libstdc++-v3/libsupc++ -D_GLIBCXX_SHARED
> > -std=gnu++14 -Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi
> > -fdiagnostics-show-location=once -ffunction-sections -fdata-sections
> > -frandom-seed=cow-ops.lo -g -O2 -D_GNU_SOURCE -minterlink-mips16 -c
> > /home/gru/proj/gcc_build/../gcc-7.3.0/libstdc++-v3/src/filesystem/cow-ops.cc
> > -fPIC -DPIC -D_GLIBCXX_SHARED -o cow-ops.o
> > In file included from
> > /home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/vector:64:0,
> > from
> > /home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/experimental/bits/fs_path.h:39,
> > from
> > /home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/experimental/filesystem:39,
> > from
> > /home/gru/proj/gcc_build/../gcc-7.3.0/libstdc++-v3/src/filesystem/dir.cc:29,
> > from
> > /home/gru/proj/gcc_build/../gcc-7.3.0/libstdc++-v3/src/filesystem/cow-dir.cc:26:
> > /home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/bits/stl_vector.h:
> > In member function 'void std::vector<_Tp,
> > _Alloc>::_M_move_assign(std::vector<_Tp, _Alloc>&&, std::true_type) [with
> > _Tp = std::experimental::filesystem::v1::path::_Cmpt; _Alloc =
> > std::allocator]':
> > /home/gru/proj/gcc_build/mipsel-linux-gnu/libstdc++-v3/include/bits/stl_vector.h:1531:9:
> > internal compiler error: Illegal instruction
> > vector __tmp(get_allocator());
> > ^
> > 0x159a473 crash_signal
> > /home/gru/proj/gcc_build/../gcc-7.3.0/gcc/toplev.c:337
> > Please submit a full bug report,
> > with preprocessed source if appropriate.
> > Please include the complete backtrace with any bug report.
> > See <https://gcc.gnu.org/bugs/> for instructions.
> > Makefile:523: recipe for target 'cow-dir.lo' failed
> > make[6]: *** [cow-dir.lo] Error 1
> >
> >
> > I have configured and launched the build as:
> >
> > $ CPATH=/usr/include/mipsel-linux-gnu/
> > LIBRARY_PATH=/usr/lib/mipsel-linux-gnu/ $PWD/../gcc-7.3.0/configure
> > --enable-languages=c,c++ --with-float=hard --disable-multiarch
> > --target=mipsel-linux-gnu
> > $ CPATH=/usr/include/mipsel-linux-gnu
> > LIBRARY_PATH=/usr/lib/mipsel-linux-gnu make -j2
> >
> > I've clearly misconfigured the build -- xgcc ended up with a wrong ISA, but
> > I can't figure out how. What am I missing?
>
Do you pass some option like march=p6500 etc or native?
I guess the problem is about nan=2008 vs nan=legacy.
> The most common reason for SIGILL is that one of the support libraries
> (gmp, mpfr, or mpc) has been built with the wrong ISA. I wouldn't
> expect that to fail on that line in libstdc++, but it's worth
> checking.
>
> The simplest way to build those libraries for use with GCC is to put
> their sources in the GCC source tree, as done by the
> contrib/download_prerequisites script. See
> https://gcc.gnu.org/wiki/InstallingGCC for more info.
--
YunQiang Su
