avoid unneed preprocessor redefinition

Limit a Mac-specific declaration that isn't needed anyway. Related to #2797
2019-08-27 05:56:52 -06:00 · 2019-08-27 05:56:52 -06:00 · a8d5a4f2f4
commit a8d5a4f2f4
parent 81bdbb19e9
1 changed files with 3 additions and 1 deletions
--- a/racket/src/racket/src/unwind/libunwind.h
+++ b/racket/src/racket/src/unwind/libunwind.h
@ -57,7 +57,9 @@ extern "C" {

 #include <inttypes.h>
 #ifndef UNW_ARM
-# define _XOPEN_SOURCE /* needed for Mac OS X */
+# ifdef __APPLE__
+#  define _XOPEN_SOURCE
+# endif
 # define __USE_GNU
 # include <ucontext.h>
 # undef __USE_GNU