Fix building with Clang/LLVM

The following diff provides some fixes for VLC to allow building
with LLVM.
Signed-off-by: Rafaël Carré <funman@videolan.org>

include/vlc_common.h

@@ -661,7 +661,7 @@ static inline uint16_t bswap16 (uint16_t x)
 VLC_USED
 static inline uint32_t bswap32 (uint32_t x)
 {
-#if VLC_GCC_VERSION(4,3)
+#if VLC_GCC_VERSION(4,3) || defined(__clang__)
     return __builtin_bswap32 (x);
 #else
     return ((x & 0x000000FF) << 24)
@@ -675,7 +675,7 @@ static inline uint32_t bswap32 (uint32_t x)
 VLC_USED
 static inline uint64_t bswap64 (uint64_t x)
 {
-#if VLC_GCC_VERSION(4,3)
+#if VLC_GCC_VERSION(4,3) || defined(__clang__)
     return __builtin_bswap64 (x);
 #elif !defined (__cplusplus)
     return ((x & 0x00000000000000FF) << 56)

include/vlc_cpu.h

@@ -40,7 +40,7 @@
 
 # if defined (__MMX__)
 #  define VLC_MMX
-# elif VLC_GCC_VERSION(4, 4)
+# elif VLC_GCC_VERSION(4, 4) || defined(__clang__)
 #  define VLC_MMX __attribute__ ((__target__ ("mmx")))
 # else
 #  define VLC_MMX VLC_MMX_is_not_implemented_on_this_compiler
@@ -48,7 +48,7 @@
 
 # if defined (__SSE__)
 #  define VLC_SSE
-# elif VLC_GCC_VERSION(4, 4)
+# elif VLC_GCC_VERSION(4, 4) || defined(__clang__)
 #  define VLC_SSE __attribute__ ((__target__ ("sse")))
 # else
 #  define VLC_SSE VLC_SSE_is_not_implemented_on_this_compiler

modules/video_filter/deinterlace/yadif.h

@@ -39,7 +39,7 @@ DECLARE_ASM_CONST(16, const xmm_reg, pw_1) = {0x0001000100010001ULL, 0x000100010
 
 
 #ifdef CAN_COMPILE_SSSE3
-#if defined(__SSE__) || VLC_GCC_VERSION(4, 4)
+#if defined(__SSE__) || VLC_GCC_VERSION(4, 4) || defined(__clang__)
 // ================ SSSE3 =================
 #define HAVE_YADIF_SSSE3
 #define COMPILE_TEMPLATE_SSE 1
@@ -55,7 +55,7 @@ DECLARE_ASM_CONST(16, const xmm_reg, pw_1) = {0x0001000100010001ULL, 0x000100010
 #endif
 
 #ifdef CAN_COMPILE_SSE2
-#if defined(__SSE__) || VLC_GCC_VERSION(4, 4)
+#if defined(__SSE__) || VLC_GCC_VERSION(4, 4) || defined(__clang__)
 // ================= SSE2 =================
 #define HAVE_YADIF_SSE2
 #define COMPILE_TEMPLATE_SSE 1
@@ -69,7 +69,7 @@ DECLARE_ASM_CONST(16, const xmm_reg, pw_1) = {0x0001000100010001ULL, 0x000100010
 #endif
 
 #ifdef CAN_COMPILE_MMX
-#if defined(__MMX__) || VLC_GCC_VERSION(4, 4)
+#if defined(__MMX__) || VLC_GCC_VERSION(4, 4) || defined(__clang__)
 // ================ MMX =================
 #define HAVE_YADIF_MMX
 #define VLC_TARGET VLC_MMX