https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90776
Bug ID: 90776
Summary: g++ -fms-extensions is inconsistent with Microsoft's
compiler
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
The code is:
typedef struct a {} A;
void f() {
if (__builtin_alignof(A))
;
}
g++ -fms-extensions rejects the code:
error: ‘__builtin_alignof’ was not declared in this scope; did you mean
‘__builtin_asinhf’?
4 | if (__builtin_alignof(A))
| ^~~~~~~~~~~~~~~~~
| __builtin_asinhf
clang++ -fms-extensions accepts the code, and Microsoft's compiler also accepts
the code:
https://godbolt.org/z/HIAYtj
Another code sample is:
class __declspec(dllexport) A
{};
g++ rejects the code:
error: expected initializer before ‘A’
1 | class __declspec(dllexport) A
|
Microsoft's compiler accepts it.
