As a note, when I tried compiling gnutls today using "-march=native"
It failed, like
$ i686-w64-mingw32-gcc test.c -march=native
/var/folders/_s/c0kwjqxn2txglx5kdpcvmj0jb5h2bk/T//ccoQWGPg.o:test.c:(.text+0x1b):
undefined reference to `__sync_val_compare_and_swap_4'
collect2: error: ld returned 1 exit status
$
i686-w64-mingw32-gcc -march=native -Q --help=target | grep march
-march=
$cat test.c
long cmpxchg( long* value, long comp_val, long new_val )
{
return __sync_val_compare_and_swap( value, comp_val, new_val );
}
int main()
{
return 0;
}
Though manually specifying seemingly "any" march works fine:
$./sandbox/cross_compilers/mingw-w64-i686/bin/i686-w64-mingw32-gcc
test.c -march=ivybridge
$
$ i686-w64-mingw32-gcc --version
i686-w64-mingw32-gcc (GCC) 5.3.0
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Native gcc works OK:
$ gcc-6 -march=native -Q --help=target | grep march
-march= ivybridge
Anybody know if this is expected or not?
Cheers!
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