X-Git-Url: https://wimlib.net/git/?a=blobdiff_plain;f=include%2Fwimlib%2Fcompiler-gcc.h;h=cb42c894800e668bf24c4098fa567a97f4e84121;hb=c3648a1bf94a11ee6eff22cb728f0efe3f4500e9;hp=46983308ec8f6b2e1bae224d2b971e4bccdd361b;hpb=855b49ef85d274588a2848d9c69974f9b88d343a;p=wimlib

diff --git a/include/wimlib/compiler-gcc.h b/include/wimlib/compiler-gcc.h
index 46983308..cb42c894 100644
--- a/include/wimlib/compiler-gcc.h
+++ b/include/wimlib/compiler-gcc.h
@@ -27,7 +27,17 @@
 #define inline			inline __attribute__((always_inline))
 #define noinline		__attribute__((noinline))
 
-#define CPU_IS_BIG_ENDIAN	(__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+/* Newer gcc supports __BYTE_ORDER__.  Older gcc doesn't.  */
+#ifdef __BYTE_ORDER__
+#  define CPU_IS_BIG_ENDIAN	(__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#elif defined(HAVE_CONFIG_H)
+#  include "config.h"
+#  ifdef WORDS_BIGENDIAN
+#    define CPU_IS_BIG_ENDIAN 1
+#  else
+#    define CPU_IS_BIG_ENDIAN 0
+#  endif
+#endif
 
 #if defined(__x86_64__) || defined(__i386__)
 #  define UNALIGNED_ACCESS_SPEED 3