I cannot compile an objective-c program on macos. The compilation of objc.h file
produce an error when encountering the SEL declaration. It seems to be already
buil-in in the compiler thus reporting a type conflict.
Source File Content (named synt.m):
===================================
#import <Object.h>
@interface MyObject : Object
+ (id)startSomething;
@end()
GCC Version
===========
gcc-15 (Homebrew GCC 15.1.0) 15.1.0
Copyright (C) 2025 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compilation command:
====================
gcc-15 -I/opt/homebrew/Cellar/gcc/15.1.0/lib/gcc/current/gcc/aarch64-apple-darwin24/15/include-gnu-runtime/objc/ -save-temps -c -o synt.o synt.m
Error Reported:
===============
In file included from /opt/homebrew/Cellar/gcc/15.1.0/lib/gcc/current/gcc/aarch64-apple-darwin24/15/include-gnu-runtime/objc/Object.h:29,
from synt.m:1:
/opt/homebrew/Cellar/gcc/15.1.0/lib/gcc/current/gcc/aarch64-apple-darwin24/15/include-gnu-runtime/objc/objc.h:72:37: error: conflicting types for 'SEL'; have 'const struct objc_selector *'
72 | typedef const struct objc_selector *SEL;
| ^~~
<built-in>: note: previous declaration of 'SEL' with type 'SEL'
make: *** [synt.o] Error 1
Host (uname -a)
===============
Darwin Jean-Marcs-MacBook-Pro.local 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:54:49 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6000 arm64
