Adjust endianness detection

[wimlib] / include / wimlib / compiler-gcc.h

diff --git a/include/wimlib/compiler-gcc.h b/include/wimlib/compiler-gcc.h
index 46983308ec8f6b2e1bae224d2b971e4bccdd361b..cb42c894800e668bf24c4098fa567a97f4e84121 100644 (file)
--- 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 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
 
 #if defined(__x86_64__) || defined(__i386__)
 #  define UNALIGNED_ACCESS_SPEED 3