Fix build-time Dispatcher discovery

Issue: MDP-51381
Test: build
(cherry picked from commit 308d814)

CMakeLists.txt

@@ -88,6 +88,11 @@ include( ${BUILDER_ROOT}/FindITT.cmake )
 include( ${BUILDER_ROOT}/FindGTest.cmake )
 include( ${BUILDER_ROOT}/ConfTargets.cmake )
 
+# should prepend others to define target mfx
+if (BUILD_DISPATCHER)
+  add_subdirectory(api/mfx_dispatch/linux)
+endif()
+
 if (BUILD_TOOLS)
   add_subdirectory(${CMAKE_HOME_DIRECTORY}/tools)
 endif()
@@ -100,10 +105,6 @@ if (BUILD_RUNTIME)
   add_subdirectory(${CMAKE_HOME_DIRECTORY}/_studio)
 endif()
 
-if (BUILD_DISPATCHER)
-  add_subdirectory(api/mfx_dispatch/linux)
-endif()
-
 create_plugins_cfg(${CMAKE_BINARY_DIR})
 
 message("")

builder/FindMFX.cmake

@@ -39,18 +39,12 @@ else()
 endif()
 
 find_path( MFX_INCLUDE mfxdefs.h PATHS ${MFX_API_HOME}/include )
-find_library( MFX_LIBRARY libmfx.a PATHS ${MFX_API_HOME}/lib PATH_SUFFIXES ${os_arch} )
 
 if( NOT MFX_INCLUDE MATCHES NOTFOUND )
   include_directories( ${MFX_API_HOME}/mediasdk_structures )
   include_directories( ${MFX_INCLUDE} )
 endif()
 
-if( NOT MFX_LIBRARY MATCHES NOTFOUND )
-  get_filename_component( MFX_LIBRARY_PATH ${MFX_LIBRARY} PATH )
-  link_directories( ${MFX_LIBRARY_PATH} )
-endif()
-
 if( NOT MFX_INCLUDE MATCHES NOTFOUND )
   set( MFX_FOUND TRUE )
   include_directories( ${MFX_INCLUDE} )
@@ -62,11 +56,6 @@ else()
   message( STATUS "Intel(R) Media SDK was found here $ENV{MFX_HOME}")
 endif()
 
-if( NOT MFX_LIBRARY MATCHES NOTFOUND )
-  get_filename_component(MFX_LIBRARY_PATH ${MFX_LIBRARY} PATH )
-  link_directories( ${MFX_LIBRARY_PATH} )
-endif()
-
 # Potential source of confusion here. Environment $MFX_VERSION translates to product name (strings libmfxhw64.so | grep mediasdk),
 # but macro definition MFX_VERSION should contain API version i.e. 1025 for API 1.25
 if( NOT DEFINED API OR API STREQUAL "master")

builder/FindPackages.cmake

@@ -145,7 +145,10 @@ function(configure_target target cflags libdirs)
 endfunction()
 
 function(configure_libmfx_target target)
-  configure_target(${ARGV0} "${LIBMFX_CFLAGS}" "${LIBMFX_LIBRARY_DIRS}")
+  # prefer local Dispatcher sources to preinstalled
+  if (NOT TARGET mfx)
+     configure_target(${ARGV0} "${PKG_MFX_CFLAGS}" "${PKG_MFX_LIBRARY_DIRS}")
+  endif()
 
   set(SCOPE_CFLAGS ${SCOPE_CFLAGS} PARENT_SCOPE)
   set(SCOPE_LINKFLAGS "${SCOPE_LINKFLAGS} -Wl,--default-symver" PARENT_SCOPE)
@@ -488,6 +491,7 @@ if( Linux )
   # optional:
   pkg_check_modules( PKG_X11       x11 )
   pkg_check_modules( PKG_LIBVA_X11 libva-x11>=0.33 )
+  pkg_check_modules( PKG_MFX       libmfx>=1.28 )
 
   if ( PKG_X11_FOUND AND PKG_LIBVA_X11_FOUND )
     set( ENABLE_X11 true )