Merge pull request #15835 from alalek:cmake_cpu_optimizations_fix_15802

cmake/OpenCVCompilerOptimizations.cmake

@@ -714,7 +714,10 @@ macro(ocv_compiler_optimization_process_sources SOURCES_VAR_NAME LIBS_VAR_NAME T
   foreach(OPT ${CPU_DISPATCH_FINAL})
     if(__result_${OPT})
 #message("${OPT}: ${__result_${OPT}}")
-      if(CMAKE_GENERATOR MATCHES "^Visual")
+      if(CMAKE_GENERATOR MATCHES "^Visual"
+          OR OPENCV_CMAKE_CPU_OPTIMIZATIONS_FORCE_TARGETS
+      )
+        # MSVS generator is not able to properly order compilation flags:
         # extra flags are added before common flags, so switching between optimizations doesn't work correctly
         # Also CMAKE_CXX_FLAGS doesn't work (it is directory-based, so add_subdirectory is required)
         add_library(${TARGET_BASE_NAME}_${OPT} OBJECT ${__result_${OPT}})

cmake/OpenCVModule.cmake

@@ -63,7 +63,6 @@ foreach(mod ${OPENCV_MODULES_BUILD} ${OPENCV_MODULES_DISABLED_USER} ${OPENCV_MOD
   unset(OPENCV_MODULE_${mod}_PRIVATE_OPT_DEPS CACHE)
   unset(OPENCV_MODULE_${mod}_LINK_DEPS CACHE)
   unset(OPENCV_MODULE_${mod}_WRAPPERS CACHE)
-  unset(OPENCV_DEPENDANT_TARGETS_${mod} CACHE)
 endforeach()
 
 # clean modules info which needs to be recalculated

cmake/OpenCVUtils.cmake

@@ -288,9 +288,22 @@ function(ocv_append_target_property target prop)
   endif()
 endfunction()
 
+if(DEFINED OPENCV_DEPENDANT_TARGETS_LIST)
+  foreach(v ${OPENCV_DEPENDANT_TARGETS_LIST})
+    unset(${v} CACHE)
+  endforeach()
+  unset(OPENCV_DEPENDANT_TARGETS_LIST CACHE)
+endif()
+
 function(ocv_append_dependant_targets target)
   #ocv_debug_message("ocv_append_dependant_targets(${target} ${ARGN})")
   _ocv_fix_target(target)
+  list(FIND OPENCV_DEPENDANT_TARGETS_LIST "OPENCV_DEPENDANT_TARGETS_${target}" __id)
+  if(__id EQUAL -1)
+    list(APPEND OPENCV_DEPENDANT_TARGETS_LIST "OPENCV_DEPENDANT_TARGETS_${target}")
+    list(SORT OPENCV_DEPENDANT_TARGETS_LIST)
+    set(OPENCV_DEPENDANT_TARGETS_LIST "${OPENCV_DEPENDANT_TARGETS_LIST}" CACHE INTERNAL "")
+  endif()
   set(OPENCV_DEPENDANT_TARGETS_${target} "${OPENCV_DEPENDANT_TARGETS_${target}};${ARGN}" CACHE INTERNAL "" FORCE)
 endfunction()