From 47b2ca9bcbd82af0c5363018723c869197d211db Mon Sep 17 00:00:00 2001
From: kichik <kichik@212acab6-be3b-0410-9dea-997c60f758d6>
Date: Thu, 15 Dec 2005 18:53:38 +0000
Subject: [PATCH] fixed bug #1370179 - endianness problem with
 FIX_ENDIAN_INT32_INPLACE

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4444 212acab6-be3b-0410-9dea-997c60f758d6
---
 SCons/Config/gnu | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/SCons/Config/gnu b/SCons/Config/gnu
index 3f31138f..99b9f12c 100644
--- a/SCons/Config/gnu
+++ b/SCons/Config/gnu
@@ -210,6 +210,36 @@ if conf.CheckPThread():
 	makensis_env.Append(LINKFLAGS = '-pthread')
 conf.Finish()
 
+#
+# GCC doesn't define __BIG_ENDIAN__ or __LITTLE_ENDIAN__, so manually check
+# for the endianess and define __BIG_ENDIAN__ if needed.
+#
+
+def check_big_endian(ctx):
+	ctx.Message('Checking for __BIG_ENDIAN__... ')
+
+	test = """
+		int main() {
+			#ifdef __BIG_ENDIAN__
+				// already defined, no need to define again
+				return 0;
+			#else
+				int i = 1;
+				char *c = (char *) &i;
+				return c[0] != 1;
+			#endif
+		}
+	"""
+
+	result = not ctx.TryRun(test, '.c')[0]
+	ctx.Result(result)
+	return result
+
+conf = defenv.Configure(custom_tests = { 'CheckBigEndian' : check_big_endian })
+if conf.CheckBigEndian():
+	makensis_env.Append(CPPFLAGS = ['__BIG_ENDIAN__'])
+conf.Finish()
+
 ### return
 
 Return('stub_env makensis_env plugin_env util_env cp_util_env')