Irony

gcc -fnext-runtime -fconstant-string-class=NSString_constant objc_msgSend.s -o objc_msgSend.o
cc1: warning: command line option "-fnext-runtime" is valid for ObjC/ObjC++ but not for C
cc1: warning: command line option "-fconstant-string-class=NSString_constant" is valid for ObjC/ObjC++ but not for C

gcc -fnext-runtime -fconstant-string-class=NSString_constant NSString_constant.s -o NSString_constant.o
cc1: warning: command line option "-fnext-runtime" is valid for ObjC/ObjC++ but not for C
cc1: warning: command line option "-fconstant-string-class=NSString_constant" is valid for ObjC/ObjC++ but not for C