From b9f0e6923d645a044f837d61a9343ea16d56504e Mon Sep 17 00:00:00 2001
From: David Bremner <david@tethera.net>
Date: Mon, 25 Nov 2013 22:55:24 -0400
Subject: util: detect byte order

Unfortunately old versions of GCC and clang do not provide byte order
macros, so we re-invent them.

If UTIL_BYTE_ORDER is not defined or defined to 0, we fall back to
macros supported by recent versions of GCC and clang
---
 configure | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 1a8e939f..13b60620 100755
--- a/configure
+++ b/configure
@@ -441,6 +441,19 @@ else
 EOF
 fi
 
+printf "Checking byte order... "
+cat> _byteorder.c <<EOF
+#include <stdio.h>
+#include <stdint.h>
+uint32_t test = 0x34333231;
+int main() { printf("%.4s\n", (const char*)&test); return 0; }
+EOF
+${CC} ${CFLAGS} _byteorder.c -o _byteorder > /dev/null 2>&1
+util_byte_order=$(./_byteorder)
+echo $util_byte_order
+
+rm -f _byteorder _byteorder.c
+
 if [ $errors -gt 0 ]; then
     cat <<EOF
 
@@ -702,6 +715,9 @@ prefix = ${PREFIX}
 # LIBDIR_IN_LDCONFIG value below is still set correctly.
 libdir = ${LIBDIR:=\$(prefix)/lib}
 
+# byte order within a 32 bit word. 1234 = little, 4321 = big, 0 = guess
+UTIL_BYTE_ORDER = ${util_byte_order}
+
 # Whether libdir is in a path configured into ldconfig
 LIBDIR_IN_LDCONFIG = ${libdir_in_ldconfig}
 
@@ -807,7 +823,9 @@ CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)      \\
 		   -DHAVE_STRSEP=\$(HAVE_STRSEP)                         \\
 		   -DSTD_GETPWUID=\$(STD_GETPWUID)                       \\
 		   -DSTD_ASCTIME=\$(STD_ASCTIME)                         \\
-		   -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)
+		   -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)	 \\
+		   -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
+
 CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)    \\
 		     \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND) \\
 		     \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS)             \\
@@ -815,6 +833,8 @@ CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS)    \\
 		     -DHAVE_STRSEP=\$(HAVE_STRSEP)                       \\
 		     -DSTD_GETPWUID=\$(STD_GETPWUID)                     \\
 		     -DSTD_ASCTIME=\$(STD_ASCTIME)                       \\
-		     -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)
+		     -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)       \\
+		     -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)
+
 CONFIGURE_LDFLAGS =  \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(XAPIAN_LDFLAGS)
 EOF
-- 
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