https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121838
Bug ID: 121838
Summary: Comma concatenation extension is not correctly
disabled with standards conforming option
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: luigighiron at gmail dot com
Target Milestone: ---
The following code is incorrectly preprocessed by GCC:
#define F(...),##__VA_ARGS__
#define G(X,...),##__VA_ARGS__
int main(){
1 F()2;
1 G()2;
}
When preprocessed with -std=c23 or -std=c++20 or newer this expands to:
int main(){
1,2;
1 2;
}
It seems like the disabling of this extension wasn't updated after omitting the
final comma in a variadic macro was standardized.
