First of all: thanks for providing recent clang packages!
Testcase:
$ cat winapi.c
#include <windows.h>
int WINAPI SomeDllFunction(int, int, int, int, int);
int call_it()
{
return SomeDllFunction(1, 2, 3, 4, 5);
}
$ clang -S winapi.c # with 20.1.8 and 21.1.1
winapi.c:2:5: warning: '__stdcall__' calling convention is not supported
for this target
[-Wignored-attributes]
2 | int WINAPI SomeDllFunction(int, int, int, int, int);
| ^
/usr/include/w32api/minwindef.h:98:16: note: expanded from macro 'WINAPI'
98 | #define WINAPI __stdcall
| ^
<built-in>:400:34: note: expanded from macro '__stdcall'
400 | #define __stdcall __attribute__((__stdcall__))
| ^
1 warning generated.
$ clang -Wsystem-headers -S winapi.c 2>&1 \
| grep -c 'warning:.*stdcall.* not supported'
8082
$ x86_64-w64-mingw32-clang -Wsystem-headers -S winapi.c 2>&1 \
| grep -c 'warning:.*stdcall.* not supported'
0
The generated assembly code is identical.
The warning does not occur with __cdecl__ attribute (no difference from
__stdcall__ in the x86_64 ABI).
--
Regards,
Christian
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