Merge topic 'generate-export-header-warnings'

1e0891e Removed GenerateExportHeader warnings about old compilers

Modules/GenerateExportHeader.cmake

@@ -156,16 +156,12 @@ macro(_test_compiler_hidden_visibility)
 
   if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.2")
     set(GCC_TOO_OLD TRUE)
-    message(WARNING "GCC version older than 4.2")
   elseif(CMAKE_COMPILER_IS_GNUC AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.2")
     set(GCC_TOO_OLD TRUE)
-    message(WARNING "GCC version older than 4.2")
   elseif(CMAKE_CXX_COMPILER_ID MATCHES Intel AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "12.0")
     set(_INTEL_TOO_OLD TRUE)
-    message(WARNING "Intel compiler older than 12.0")
   endif()
 
-
   # Exclude XL here because it misinterprets -fvisibility=hidden even though
   # the check_cxx_compiler_flag passes
   # http://www.cdash.org/CDash/testDetails.php?test=109109951&build=1419259