__GNUC__ is not defined

[Lycbel]

for issue https://github.com/kframework/c-semantics/issues/347 can work around by install lua5.1, then no need to compile the minilua but it will have new problem in lj_def.h , it need to have the predefined macro __GNUC__, but kcc doesn't have it Try to define it by adding CFLAGS -D__GNUC__=5. But in the code it keeps undefined. seems we can't define it by this way. However can define it in the file by #define __GNUC__ 5 small example: for file main.c

int main(){
  int a = __GNUC__;
}

compile by: kcc main.c kcc main.c -D__GNUC__=5 both will fail, but gcc will success. error is:

mian.c:2:3: error: Trying to look up identifier __GNUC__, but no such identifier is in scope.

    Syntax error (SE-CID1):
        see C11 section 6.5.1:2 http://rvdoc.org/C11/6.5.1
        see CERT-C section DCL31-C http://rvdoc.org/CERT-C/DCL31-C