From 6ccf77a13f31c97818ae9159a9d9e47eae604008 Mon Sep 17 00:00:00 2001
From: Jeremy Huddleston <jeremyhu@apple.com>
Date: Sun, 18 Mar 2012 23:21:09 -0700
Subject: [PATCH 2/2] fcarch: Check for architecture type at runtime rather
 than build time

https://bugs.freedesktop.org/show_bug.cgi?id=20208

Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>
---
 src/fcarch.h |   75 ++++++++++++++++++++++++++++++++--------------------------
 1 file changed, 42 insertions(+), 33 deletions(-)

diff --git a/src/fcarch.h b/src/fcarch.h
index 8695933..0675994 100644
--- a/src/fcarch.h
+++ b/src/fcarch.h
@@ -40,23 +40,27 @@ FC_ASSERT_STATIC (4 == sizeof (FcValueBinding));
 FC_ASSERT_STATIC (8 == sizeof (FcAlign));
 FC_ASSERT_STATIC (0x20 == sizeof (FcCharLeaf));
 
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (intptr_t));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcPatternEltPtr));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcValueListPtr));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (char *));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (struct FcPatternElt *));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcValueList *));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcStrSet *));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcCharLeaf **));
-FC_ASSERT_STATIC (SIZEOF_VOID_P == sizeof (FcChar16 *));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (intptr_t));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcPatternEltPtr));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcValueListPtr));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (char *));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (struct FcPatternElt *));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcValueList *));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcStrSet *));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcCharLeaf **));
+FC_ASSERT_STATIC (sizeof(void *) == sizeof (FcChar16 *));
 
-FC_ASSERT_STATIC (0x08 + 1*ALIGNOF_DOUBLE == sizeof (FcValue));
-FC_ASSERT_STATIC (0x00 + 2*SIZEOF_VOID_P == sizeof (FcPatternElt));
-FC_ASSERT_STATIC (0x08 + 2*SIZEOF_VOID_P == sizeof (FcPattern));
-FC_ASSERT_STATIC (0x08 + 2*SIZEOF_VOID_P == sizeof (FcCharSet));
-FC_ASSERT_STATIC (0x08 + 6*SIZEOF_VOID_P == sizeof (FcCache));
-#endif
+FC_ASSERT_STATIC (0x08 + offsetof(struct { char c; double d; }, d) == sizeof (FcValue));
+FC_ASSERT_STATIC (0x00 + 2*sizeof(void *) == sizeof (FcPatternElt));
+FC_ASSERT_STATIC (0x08 + 2*sizeof(void *) == sizeof (FcPattern));
+FC_ASSERT_STATIC (0x08 + 2*sizeof(void *) == sizeof (FcCharSet));
+FC_ASSERT_STATIC (0x08 + 6*sizeof(void *) == sizeof (FcCache));
 
+#ifdef __APPLE__
+#include <machine/endian.h>
+#endif
+#endif
+ 
 /*
  * Each unique machine architecture needs an entry in this file
  * So far the differences boil down to: endianness, 32 vs 64 bit pointers,
@@ -86,31 +90,36 @@ FC_ASSERT_STATIC (0x08 + 6*SIZEOF_VOID_P == sizeof (FcCache));
  */
 #define FC_ARCH_MAX_LEN 6
 static inline int _FcGetArch(FcChar8 *buffer) {
+    const char *endian;
+    int ptr_bytes;
+    int dbl_align;
+
     if (buffer == NULL)
         return EINVAL;
 
-#if defined(WORDS_BIGENDIAN) && WORDS_BIGENDIAN
-# define FC_ARCH_ENDIAN "be"
-#else /* !WORDS_BIGENDIAN */
-# define FC_ARCH_ENDIAN "le"
-#endif
+#ifdef FC_ARCHITECTURE
+    /* If FC_ARCHITECTURE is set, use it */
+    snprintf((char *) buffer, FC_ARCH_MAX_LEN + 1, "%s", FC_ARCHITECTURE);
+#else
 
-#if SIZEOF_VOID_P == 4
-# if ALIGNOF_DOUBLE == 4
-#  define FC_ARCH_SIZE_ALIGN "32d4"
-# else /* ALIGNOF_DOUBLE != 4 */
-#  define FC_ARCH_SIZE_ALIGN "32d8"
-# endif
-#else /* SIZEOF_VOID_P != 4 */
-# define FC_ARCH_SIZE_ALIGN "64"
+#if defined(__DARWIN_BYTE_ORDER) && __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
+    endian = "le";
+#elif defined(__DARWIN_BYTE_ORDER) && __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN
+    endian = "be";
+#elif defined(__DARWIN_BYTE_ORDER) && __DARWIN_BYTE_ORDER == __DARWIN_PDP_ENDIAN
+    endian = "pe";
+#elif defined(WORDS_BIGENDIAN) && WORDS_BIGENDIAN
+    /* Fallback on what configure tells us */
+    endian = "be";
+#else
+    endian = "le";
 #endif
 
-/* config.h might override this */
-#ifndef FC_ARCHITECTURE
-# define FC_ARCHITECTURE FC_ARCH_ENDIAN FC_ARCH_SIZE_ALIGN
-#endif
+    ptr_bytes = 8 * sizeof(void *);
+    dbl_align = offsetof(struct { char c; double d; }, d);
 
-    snprintf((char *) buffer, FC_ARCH_MAX_LEN + 1, "%s", FC_ARCHITECTURE);
+    snprintf((char *) buffer, FC_ARCH_MAX_LEN + 1, "%s%d%d", endian, ptr_bytes, dbl_align);
+#endif
 
     return 0;
 }
-- 
1.7.9.2