[Bug ld/12762] lto produces multiple definition errors for all symbols (including CRT) in C++

[xunxun1982 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=12762

--- Comment #25 from xunxun <xunxun1982 at gmail dot com> 2011-09-18 22:26:00 
UTC ---
Created attachment 5936
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5936
mingw64-testcase

Add mingw64 testcase, the source is from mingw64 CRT source.

You can build the source code using mingw64 compiler as follows to reproduce
the issue:

gcc -flto  -DHAVE_CONFIG_H -I.  -m32 -I./include -D_CRTBLD  -pipe -std=gnu99 -c
./math/sin.c
gcc -flto  -DHAVE_CONFIG_H -I.  -m32 -I./include -D_CRTBLD  -pipe -std=gnu99 -c
./math/sinl_internal.S
gcc -flto -DHAVE_CONFIG_H -I.  -m32 -D_SYSCRT=1 -DCRTDLL=1 -I./include
-D_CRTBLD  -pipe -std=gnu99 -c ./crt/merr.c

ar cru libm1.a sin.o sinl_internal.o

gcc -flto -fuse-linker-plugin main.c libm1.a merr.o

In the end, it will show like this:
`___mingw_raise_matherr' referenced in section `.text' of
e:/mypack/mingw/bin/../lib/gcc/i686-w64-mingw32/4.6.2/../../../../i686-w64-mingw32/lib/../lib/libmingwex.a(lib32_libmingwex_a-sin.o):
defined in discarded section `.text' of merr.o (symbol from plugin)
`___mingw_raise_matherr' referenced in section `.text' of
e:/mypack/mingw/bin/../lib/gcc/i686-w64-mingw32/4.6.2/../../../../i686-w64-mingw32/lib/../lib/libmingwex.a(lib32_libmingwex_a-sin.o):
defined in discarded section `.text' of merr.o (symbol from plugin)
collect2: ld returned 1 exit status

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