[FFmpeg-devel] [PATCH] avcodec/videotoolbox: fix use of unknown builtin '__builtin_available'

[lance.lmwang at gmail.com]

From: Limin Wang <lance.lmwang at gmail.com>

Old system is:
OSX version: 10.11.6
Apple LLVM version 8.0.0 (clang-800.0.42.1)
Target: x86_64-apple-darwin15.6.0

Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
 libavcodec/videotoolbox.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/videotoolbox.c b/libavcodec/videotoolbox.c
index 284da97..195706c 100644
--- a/libavcodec/videotoolbox.c
+++ b/libavcodec/videotoolbox.c
@@ -895,7 +895,7 @@ static int videotoolbox_start(AVCodecContext *avctx)
         break;
     }
 
-#if defined(MAC_OS_X_VERSION_10_9) && !TARGET_OS_IPHONE && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9)
+#if defined(MAC_OS_X_VERSION_10_9) && !TARGET_OS_IPHONE && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9) && AV_HAS_BUILTIN(__builtin_available)
     if (avctx->codec_id == AV_CODEC_ID_PRORES) {
         if (__builtin_available(macOS 10.9, *)) {
             VTRegisterProfessionalVideoWorkflowVideoDecoders();
@@ -903,7 +903,7 @@ static int videotoolbox_start(AVCodecContext *avctx)
     }
 #endif
 
-#if defined(MAC_OS_VERSION_11_0) && !TARGET_OS_IPHONE && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0)
+#if __clang_major__ >= 9 && defined(MAC_OS_VERSION_11_0) && !TARGET_OS_IPHONE && (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_VERSION_11_0) && AV_HAS_BUILTIN(__builtin_available)
     if (__builtin_available(macOS 11.0, *)) {
         VTRegisterSupplementalVideoDecoderIfAvailable(videotoolbox->cm_codec_type);
     }
-- 
2.6.4