Rafael,
Oh yeah, ... It seems C++ ABI diverged between Cygwin and Mingw since 4.7...
(FYI, also cygwin64 is different from x86_64-mingw32 in some point...)
For example;
class Foo {
public:
int Method(int a, int b, int c);
};
int xxx(Foo *p, int a, int b, int c) {
return p->Method(a, b, c);
}
; i686-pc-mingw32-g++-4.7.3 (on cygwin)
__Z3xxxP3Fooiii:
LFB0:
.cfi_startproc
subl $28, %esp
.cfi_def_cfa_offset 32
movl 44(%esp), %eax
movl 32(%esp), %ecx
movl %eax, 8(%esp)
movl 40(%esp), %eax
movl %eax, 4(%esp)
movl 36(%esp), %eax
movl %eax, (%esp)
call __ZN3Foo6MethodEiii
.cfi_def_cfa_offset 20
subl $12, %esp
.cfi_def_cfa_offset 32
addl $28, %esp
.cfi_def_cfa_offset 4
ret
.cfi_endproc
; Cygwin's g++-4.7.3
__Z3xxxP3Fooiii:
LFB0:
.cfi_startproc
jmp __ZN3Foo6MethodEiii
.cfi_endproc
2013/11/20 Rafael Espíndola <rafael.espind...@gmail.com>:
> Now that 3.4 branched and we will soon require gcc 4.7 to build, it
> probably makes more sense to use the new gcc 4.7 abi on mingw.
>
> The difference is documented is
> http://gcc.gnu.org/gcc-4.7/changes.html. GCC now uses thiscall by
> default for methods. This also has the benefit of helping shake down
> bugs since this is also true in the win32 abi.
>
> Cheers,
> Rafael
_______________________________________________
cfe-commits mailing list
cfe-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
