examples/CMakeLists.txt: restrict required libraries for avformat_open_input()

When checking if avformat_open_input() exists, link only with
FFMPEG_LIBAVFORMAT_LIBRARIES, this is more essential and also more
symmetric from a readability point of view.

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 16c18f3..d44a26f 100644 (file)
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -16,7 +16,7 @@ endif()
 option(BUILD_AM7XXX-PLAY "Build a more complete example: am7xxx-play" TRUE)
 if(BUILD_AM7XXX-PLAY)
   find_package(FFmpeg REQUIRED)
 option(BUILD_AM7XXX-PLAY "Build a more complete example: am7xxx-play" TRUE)
 if(BUILD_AM7XXX-PLAY)
   find_package(FFmpeg REQUIRED)

-  set(CMAKE_REQUIRED_LIBRARIES ${FFMPEG_LIBRARIES})
+  set(CMAKE_REQUIRED_LIBRARIES ${FFMPEG_LIBAVFORMAT_LIBRARIES})

   set(CMAKE_REQUIRED_INCLUDES ${FFMPEG_LIBAVFORMAT_INCLUDE_DIRS})
   check_symbol_exists(avformat_open_input
     "libavformat/avformat.h"
   set(CMAKE_REQUIRED_INCLUDES ${FFMPEG_LIBAVFORMAT_INCLUDE_DIRS})
   check_symbol_exists(avformat_open_input
     "libavformat/avformat.h"