https://bugs.llvm.org/show_bug.cgi?id=42176
Bug ID: 42176
Summary: clang -fms-extensions accepts a wrong code
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: zhong...@pku.org.cn
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
My clang is clang version 9.0.0 (trunk 362565) (llvm/trunk 362564), and my code
is:
typedef struct a {} A;
void f() {
if (__builtin_alignof(A))
;
}
When compiling with clang++ -c -fms-extensions, it accepts the above code, but
clang++ rejects the code with other parameters. For example, with only -c, the
message is as follow:
4: error: unexpected type name 'A': expected expression
if (__builtin_alignof(A))
^
1 error generated.
Here, I tried g++, it also rejects the code:
: error: ‘__builtin_alignof’ was not declared in this scope; did you mean
‘__builtin_asinhf’?
4 | if (__builtin_alignof(A))
| ^~~~~~~~~~~~~~~~~
| __builtin_asinhf
So, with -fms-extensions, clang++ accepts wrong code?
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