Let's Cc: the ObjC maintainer: Segher On Sat, Jun 07, 2025 at 12:12:14PM -0400, Jean-Marc Farinas via Gcc-help wrote: > 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 >
