[cogl/cogl-1.16] Include endian.h before checking __FLOAT_WORD_ORDER

[Neil Roberts <nroberts src gnome org>]

commit 9730b9d6a6222ff5edd00d54110a3dc9ce407c03
Author: Neil Roberts <neil linux intel com>
Date:   Wed Jul 3 17:37:48 2013 +0100

    Include endian.h before checking __FLOAT_WORD_ORDER
    
    CoglFixed was trying to use the __FLOAT_WORD_ORDER macro in order to
    do some fast float conversions but it wasn't including any header that
    could define it so it was giving an annoying warning. This patch
    checks for the macro in endian.h in the configure script and only
    checks its value if it's available.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/cogl-fixed.c |    8 ++++++++
 configure.ac      |    5 ++++-
 2 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/cogl/cogl-fixed.c b/cogl/cogl-fixed.c
index a144d84..4d92155 100644
--- a/cogl/cogl-fixed.c
+++ b/cogl/cogl-fixed.c
@@ -30,6 +30,10 @@
 #include <glib-object.h>
 #include <gobject/gvaluecollector.h>
 
+#ifdef HAVE_FLOAT_WORD_ORDER
+#include <endian.h>
+#endif
+
 #include "cogl-fixed.h"
 
 /* pre-computed sin table for 1st quadrant
@@ -306,6 +310,7 @@ static const double _magic = 68719476736.0 * 1.5;
  *
  * FIXME - this should go inside the configure.ac
  */
+#ifdef HAVE_FLOAT_WORD_ORDER
 #if (__FLOAT_WORD_ORDER == 1234)
 #define _COGL_MAN                      0
 #elif (__FLOAT_WORD_ORDER == 4321)
@@ -313,6 +318,9 @@ static const double _magic = 68719476736.0 * 1.5;
 #else
 #define COGL_NO_FAST_CONVERSIONS
 #endif
+#else /* HAVE_FLOAT_WORD_ORDER */
+#define COGL_NO_FAST_CONVERSIONS
+#endif /* HAVE_FLOAT_WORD_ORDER */
 
 /*
  * cogl_double_to_fixed :
diff --git a/configure.ac b/configure.ac
index 51b4b0a..bb62411 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1295,7 +1295,10 @@ dnl ================================================================
 AC_PATH_X
 AC_HEADER_STDC
 AC_CHECK_HEADERS(fcntl.h limits.h unistd.h)
-
+AC_CHECK_HEADER([endian.h],
+                [AC_CHECK_DECL([__FLOAT_WORD_ORDER],
+                               AC_DEFINE([HAVE_FLOAT_WORD_ORDER], [1],
+                                         [Has the __FLOAT_WORD_ORDER macro]))])
 
 dnl ================================================================
 dnl Checks for library functions.