https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69391
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2016-01-20 CC| |jakub at gcc dot gnu.org, | |mpolacek at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- This changed behavior with r213102 aka PR61861. Self-contained testcase: #define STR_I(X) #X #define STR(X) STR_I(X) #define LINE STR(__LINE__) STR(__LINE__) #define LINE2() STR(__LINE__) STR(__LINE__) int main() { __builtin_printf ("%s\n", LINE); __builtin_printf ("%s\n", LINE2 ()); return 0; } I'm getting the same behavior for function-like macros like other macros though.