printf can be a macro

Namely glibc has this macro on -DFORTIFY_SOURCE.  We have to prevent
macro redefinition with different macro body.

1 files changed, 1 insertions, 0 deletions

diff --git a/compile.c b/compile.c
index ace7a468e9..985debe559 100644
--- a/compile.c
+++ b/compile.c
@@ -189,6 +189,7 @@ const ID rb_iseq_shared_exc_local_tbl[] = {idERROR_INFO};
 #endif
 
 #if CPDEBUG > 1 || CPDEBUG < 0
+#undef printf
 #define printf ruby_debug_printf
 #define debugs if (compile_debug_print_indent(1)) ruby_debug_printf
 #define debug_compile(msg, v) ((void)(compile_debug_print_indent(1) && fputs((msg), stderr)), (v))