X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavutil%2Fattributes.h;h=ef990a1d4f45c3453c4c3d44cf3547a667c43469;hb=17aa02b9a112398f8d9f74dcb3db55c31e91c8fe;hp=0580c9846894b23763562ba36caae2fba8f80388;hpb=2791730dbf99f3bbade1eb9eabb49424ce75c0c5;p=ffmpeg

diff --git a/libavutil/attributes.h b/libavutil/attributes.h
index 0580c984689..ef990a1d4f4 100644
--- a/libavutil/attributes.h
+++ b/libavutil/attributes.h
@@ -1,25 +1,25 @@
 /*
  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file libavutil/attributes.h
+ * @file
  * Macro definitions for various function/variable attributes
  */
 
@@ -65,7 +65,7 @@
 #endif
 
 #ifndef av_cold
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,3)
+#if AV_GCC_VERSION_AT_LEAST(4,3)
 #    define av_cold __attribute__((cold))
 #else
 #    define av_cold
@@ -73,7 +73,7 @@
 #endif
 
 #ifndef av_flatten
-#if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,1)
+#if AV_GCC_VERSION_AT_LEAST(4,1)
 #    define av_flatten __attribute__((flatten))
 #else
 #    define av_flatten
@@ -96,6 +96,27 @@
 #endif
 #endif
 
+/**
+ * Mark a variable as used and prevent the compiler from optimizing it
+ * away.  This is useful for variables accessed only from inline
+ * assembler without the compiler being aware.
+ */
+#ifndef av_used
+#if AV_GCC_VERSION_AT_LEAST(3,1)
+#    define av_used __attribute__((used))
+#else
+#    define av_used
+#endif
+#endif
+
+#ifndef av_alias
+#if AV_GCC_VERSION_AT_LEAST(3,3)
+#   define av_alias __attribute__((may_alias))
+#else
+#   define av_alias
+#endif
+#endif
+
 #ifndef av_uninit
 #if defined(__GNUC__) && !defined(__ICC)
 #    define av_uninit(x) x=x
@@ -104,4 +125,12 @@
 #endif
 #endif
 
+#ifdef __GNUC__
+#    define av_builtin_constant_p __builtin_constant_p
+#    define av_printf_format(fmtpos, attrpos) __attribute__((__format__(__printf__, fmtpos, attrpos)))
+#else
+#    define av_builtin_constant_p(x) 0
+#    define av_printf_format(fmtpos, attrpos)
+#endif
+
 #endif /* AVUTIL_ATTRIBUTES_H */