https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114007
Bug ID: 114007
Summary: gcc chokes on
__has_cpp_attribute(clang::unsafe_buffer_usage)
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: iains at gcc dot gnu.org
Target Milestone: ---
In Xcode 15.3 beta 3, <sys/cdefs.h> gained the equivalent of the following:
$ cat cd2.c
#ifndef __has_cpp_attribute
#define __has_cpp_attribute(x) 0
#endif
#if __has_cpp_attribute(clang::unsafe_buffer_usage)
#define __has_safe_buffers 1
#endif
Unfortunately, this breaks quite a number of testcases with -std below c23:
$ gcc -std=c11 -c cd2.c
cd2.c:5:30: error: missing ')' after "__has_attribute"
5 | #if __has_cpp_attribute(clang::unsafe_buffer_usage)
| ^
cd2.c:5:31: error: ':' without preceding '?'
5 | #if __has_cpp_attribute(clang::unsafe_buffer_usage)
| ^
while g++ always accepts it. However, current clang/clang++ main always
accepts
it.
