[Buildroot] [PATCH 1/1] package/ffmpeg: add -latomic to libavformat.pc

[Fabrice Fontaine <fontaine.fabrice@gmail.com>]

-latomic was added to extralibs to fix static build of ffmpeg in commit
fc8798197b57488a852e2c14b4677b5eb0114a0b. However, extralibs is not
added to libavformat.pc resulting in the following static build failure
of motion:

/home/buildroot/autobuild/instance-1/output-1/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-uclibcgnueabi/9.3.0/../../../../arm-buildroot-linux-uclibcgnueabi/bin/ld: /home/buildroot/autobuild/instance-1/output-1/host/bin/../arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libavformat.a(fifo.o): in function `fifo_init':
/home/buildroot/autobuild/instance-1/output-1/build/ffmpeg-4.4/libavformat/fifo.c:519: undefined reference to `__atomic_store_8'

So add a patch to add extralibs (and so -latomic) to libavformat.pc

Fixes:
 - http://autobuild.buildroot.org/results/62ec618e40081a250b8129ec6f5a178eb06fba1d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
---
 ...-add-extralibs-to-extralibs_avformat.patch | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 package/ffmpeg/0004-configure-add-extralibs-to-extralibs_avformat.patch

diff --git a/package/ffmpeg/0004-configure-add-extralibs-to-extralibs_avformat.patch b/package/ffmpeg/0004-configure-add-extralibs-to-extralibs_avformat.patch
new file mode 100644
index 0000000000..f4a2f75e59
--- /dev/null
+++ b/package/ffmpeg/0004-configure-add-extralibs-to-extralibs_avformat.patch
@@ -0,0 +1,30 @@
+From 2aee898241246d293bed9b609926b4a8014dfcb9 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 6 Aug 2021 09:17:20 +0200
+Subject: [PATCH] configure: add extralibs to extralibs_avformat
+
+Add extralibs to extralibs_avformat to allow applications such as motion
+to retrieve ffmpeg dependencies such as -latomic through pkg-config
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: not upstreamable]
+---
+ configure | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure b/configure
+index 0bb3a7cf2b..cb366c3ba6 100755
+--- a/configure
++++ b/configure
+@@ -7604,7 +7604,7 @@ LIBPREF=${LIBPREF}
+ LIBSUF=${LIBSUF}
+ extralibs_avutil="$avutil_extralibs"
+ extralibs_avcodec="$avcodec_extralibs"
+-extralibs_avformat="$avformat_extralibs"
++extralibs_avformat="$avformat_extralibs $extralibs"
+ extralibs_avdevice="$avdevice_extralibs"
+ extralibs_avfilter="$avfilter_extralibs"
+ extralibs_avresample="$avresample_extralibs"
+-- 
+2.30.2
+
-- 
2.30.2

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