Merge pull request #7868 from alalek:icc_2.4

(2.4) Build with ICC

cmake/OpenCVCompilerOptions.cmake

@@ -97,6 +97,10 @@ if(BUILD_TINY_GPU_MODULE)
   add_definitions(-DOPENCV_TINY_GPU_MODULE)
 endif()
 
+if(CV_ICC AND NOT ENABLE_FAST_MATH)
+  add_extra_compiler_option("-fp-model precise")
+endif()
+
 if(CMAKE_COMPILER_IS_GNUCXX)
   # High level of warnings.
   add_extra_compiler_option(-W)
@@ -364,4 +368,10 @@ if(MSVC)
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4589") # Constructor of abstract class ... ignores initializer for virtual base class 'cv::Algorithm'
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4359") # Alignment specifier is less than actual alignment (4), and will be ignored
   endif()
+
+  if(CV_ICC AND NOT ENABLE_NOISY_WARNINGS)
+    foreach(flags CMAKE_CXX_FLAGS CMAKE_CXX_FLAGS_RELEASE CMAKE_CXX_FLAGS_DEBUG CMAKE_C_FLAGS CMAKE_C_FLAGS_RELEASE CMAKE_C_FLAGS_DEBUG)
+      string(REGEX REPLACE "( |^)/W[0-9]+( |$)" "\\1\\2" ${flags} "${${flags}}")
+    endforeach()
+  endif()
 endif()