daf7dd87f4
Autotools miss avcodec function check when linking statically, leading to conflicts between local functions and avcodec functions. Add patch to swap $FFMPEG_LIBS and -lavutil which are checked when AC_CHECK_LIB on avcodec_* functions. $FFMPEG_LIBS contain -ldrm that must be listed after -lavutil. Fixes: http://autobuild.buildroot.net/results/394/3945e06ea0dd1e16013184fbab5b67b3561c87ce/ http://autobuild.buildroot.net/results/576/576c7d71313c45753848462717200b2b8ff5bb0e/ http://autobuild.buildroot.net/results/f33/f339ac6ea30815eeb8ecb144c971f56c06a9f995 [Peter: adjust commit message to clarify that this is for static linking] Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
43 lines
1.4 KiB
Diff
43 lines
1.4 KiB
Diff
From d12e74a559602b3dff9a6bf38fcbb139535c9c9c Mon Sep 17 00:00:00 2001
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From: Giulio Benetti <giulio.benetti@micronovasrl.com>
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Date: Mon, 3 Sep 2018 20:27:00 +0200
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Subject: [PATCH] m4: fix local ffmpeg and avcodec function conflict
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Autotools miss avcodec function check.
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This is due to linker library list order, -ldrm is appended too early
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respect to -lavutil. This results in missing drm library functions for
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avcodec functions:
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- drmGetVersion()
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- drmFreeVersion()
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So these functions:
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- avcodec_get_context_defaults3
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- avcodec_open2
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- avcodec_encode_video2
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can't link correctly during check and they seem not to be present.
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Then macros HAVE_FUN_avcodec_* are not defined in mediastreamer-config.h
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So local avcodec functions conflict with real avcodec library functions.
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In acinclude.m4 file, swap $FFMPEG_LIBS and -lavutil if avcodec is found.
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Signed-off-by: Giulio Benetti <giulio.benetti@micronovasrl.com>
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---
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acinclude.m4 | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/acinclude.m4 b/acinclude.m4
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index 6c31ed82..89ff6643 100644
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--- a/acinclude.m4
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+++ b/acinclude.m4
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@@ -110,7 +110,7 @@ AC_DEFUN([MS_CHECK_VIDEO],[
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if test x$avcodec_found = xno ; then
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AC_MSG_WARN([Could not find libavcodec (from ffmpeg) headers and library.])
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else
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- FFMPEG_LIBS="$FFMPEG_LIBS -lavutil"
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+ FFMPEG_LIBS="-lavutil $FFMPEG_LIBS"
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fi
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--
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2.17.1
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