[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 #27 from xunxun <xunxun1982 at gmail dot com> 2011-09-20 23:09:04 
UTC ---
I use gcc -flto -fuse-linker-plugin main.c libm1.a merr.o -save-temps to save
some intermediate files, and this can generate a .s called ccJ5043j.ltrans0.s.

I use the command:
gcc -flto -fuse-linker-plugin ccJ5043j.ltrans0.s

it shows:

e:/mypack/mingw/bin/../lib/gcc/i686-w64-mingw32/4.6.2/../../../../i686-w64-mingw32/lib/../lib/libmingw32.a(lib32_libmingw32_a-merr.o):merr.c:(.text+0x50):
multiple definition of `__mingw_setusermatherr'
R:\Temp\cchQZ96c.o:ccJ5043j.ltrans0.o:(.text+0xa8): first defined here
e:/mypack/mingw/bin/../lib/gcc/i686-w64-mingw32/4.6.2/../../../../i686-w64-mingw32/lib/../lib/libmingw32.a(lib32_libmingw32_a-merr.o):merr.c:(.text+0x60):
multiple definition of `_matherr'
R:\Temp\cchQZ96c.o:ccJ5043j.ltrans0.o:(.text+0x0): first defined here
collect2: ld returned 1 exit status

This is different from Comment 25

I can use gcc -flto -fuse-linker-plugin ccJ5043j.ltrans0.s
-Wl,--allow-multiple-definition to build successfully.

So I think some multiple defined determination in cofflink.c is wrong, which
may be identified with discarded section.

Any ideas?

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