Workaround cmake's random library order in external_ffmpeg

external/ffmpeg/CMakeLists.txt

@@ -24,17 +24,21 @@ if (DESKTOP_APP_USE_PACKAGED)
         PkgConfig::SWSCALE
         PkgConfig::SWRESAMPLE
     )
-else()
+
-    if (LINUX)
+    return()
-        target_link_static_libraries(external_ffmpeg
+endif()
-        INTERFACE
+
-            avformat
+set(ffmpeg_lib_list)
-            avcodec
+
-            swresample
+if (LINUX)
-            swscale
+    list(APPEND ffmpeg_lib_list
-            avutil
+        -lavformat
+        -lavcodec
+        -lswresample
+        -lswscale
+        -lavutil
     )
-    else()
+else()
     set(ffmpeg_lib_loc ${libs_loc}/ffmpeg)
 
     target_include_directories(external_ffmpeg SYSTEM
@@ -42,27 +46,42 @@ else()
         ${ffmpeg_lib_loc}
     )
 
-        target_link_libraries(external_ffmpeg
+    list(APPEND ffmpeg_lib_list
-        INTERFACE
         ${ffmpeg_lib_loc}/libavformat/libavformat.a
         ${ffmpeg_lib_loc}/libavcodec/libavcodec.a
         ${ffmpeg_lib_loc}/libswresample/libswresample.a
         ${ffmpeg_lib_loc}/libswscale/libswscale.a
         ${ffmpeg_lib_loc}/libavutil/libavutil.a
     )
-    endif()
+endif()
 
+list(APPEND ffmpeg_lib_list
+    $<TARGET_FILE:desktop-app::external_opus>
+    $<TARGET_FILE:desktop-app::external_vpx>
+)
+
+if (APPLE)
+    list(APPEND ffmpeg_lib_list bz2)
+elseif (LINUX)
+    list(APPEND ffmpeg_lib_list -llzma)
+endif()
+
+# Workaround cmake's random order on Linux...
+if (LINUX)
+    list(JOIN ffmpeg_lib_list , ffmpeg_lib_link)
     target_link_libraries(external_ffmpeg
     INTERFACE
-        $<LINK_ONLY:desktop-app::external_opus>
+        -Wl,--push-state,-Bstatic,${ffmpeg_lib_link},--pop-state
-        $<TARGET_FILE:desktop-app::external_opus>
+    )
-        $<LINK_ONLY:desktop-app::external_vpx>
+else()
-        $<TARGET_FILE:desktop-app::external_vpx>
+    target_link_libraries(external_ffmpeg
+    INTERFACE
+        ${ffmpeg_lib_list}
     )
-
-    if (APPLE)
-        target_link_libraries(external_ffmpeg INTERFACE bz2)
-    elseif (LINUX)
-        target_link_static_libraries(external_ffmpeg INTERFACE lzma)
-    endif()
 endif()
+
+target_link_libraries(external_ffmpeg
+INTERFACE
+    $<LINK_ONLY:desktop-app::external_opus>
+    $<LINK_ONLY:desktop-app::external_vpx>
+)