Test expected no-op instead of aborting the build.

Aborting causes make clean to fail if the executable is not created.

Tests/Module/GenerateExportHeader/CMakeLists.txt

@@ -76,7 +76,10 @@ endmacro()
 
 macro(build_fail Include Library LibrarySource Source Message)
   _do_build(${Include} ${Library} ${LibrarySource} "${Source}")
-  test_fail(Result ${Message})
+  if((USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY) OR WIN32)
+    test_fail(Result ${Message})
+  endif()
+    test_pass(Result ${Message})
 endmacro()
 
 macro(build_pass Include Library LibrarySource Source Message)
@@ -88,12 +91,6 @@ include(GenerateExportHeader)
 
 add_compiler_export_flags()
 
-if(NOT ((USE_COMPILER_HIDDEN_VISIBILITY AND COMPILER_HAS_HIDDEN_VISIBILITY) OR WIN32))
-  message(WARNING "Compiler does not support export feature")
-  return()
-endif()
-
-
 if (MSVC)
   add_definitions(-DCOMPILER_IS_MSVC)
 endif()