After upgrading to recent mingw64 toolchain, builds with link time
optimizer fail during linking.
Testcase:
$ cat true.c
int main() { return 0; }
$ cygcheck -f /usr/bin/i686-w64-mingw32-gcc
mingw64-i686-gcc-core-4.9.2-1
$ cygcheck -f /usr/bin/i686-w64-mingw32-ld
mingw64-i686-binutils-2.25.0.1.23f238d-1
$ i686-w64-mingw32-gcc -flto true.c
/tmp/ccukCXyi.ltrans0.ltrans.o:ccukCXyi.ltrans0.o:(.text+0x0): multiple
definition of `main'
/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/libmingw32.a(lib32_libmingw32_a-crt0_c.o):/usr/src/debug/mingw64-i686-runtime-4.0.2-1/crt/crt0_c.c:17:
first defined here
/usr/i686-w64-mingw32/sys-root/mingw/lib/../lib/libmingw32.a(lib32_libmingw32_a-crt0_c.o):
In function `main':
/usr/src/debug/mingw64-i686-runtime-4.0.2-1/crt/crt0_c.c:18: undefined
reference to `WinMain@16'
collect2: error: ld returned 1 exit status
Same with x86_64 mingw.
Downgrading the mingw64 binutils package helps:
$ cygcheck -f /usr/bin/i686-w64-mingw32-gcc
mingw64-i686-gcc-core-4.9.2-1
$ cygcheck -f /usr/bin/i686-w64-mingw32-ld
mingw64-i686-binutils-2.24.0.3.85cf705-1
$ i686-w64-mingw32-gcc -flto true.c
May or may not be an upstream issue. The current mingw64 toolchain on
Debian jessie (gcc 4.9.1-19+14.3, binutils 2.25-5+5.2) works as expected.
Christian
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