ASSume that MSVC is the only compiler who uses the __declspec() syntax

Sources/Plasma/CoreLib/HeadSpin.h

@@ -145,7 +145,7 @@ typedef uint32_t  hsGSeedValue;
 #   define hsDeprecated(message) [[deprecated(message)]]
 #elif defined(HAVE_GCC_DEPRECATED_ATTR)
 #   define hsDeprecated(message) __attribute__((deprecated(message)))
-#elif defined(HAVE_MSVC_DEPRECATED_ATTR)
+#elif defined(_MSC_VER)
 #   define hsDeprecated(message) __declspec(deprecated(message))
 #else
 #   define hsDeprecated(message)

cmake/CompilerChecks.cmake

@@ -47,10 +47,6 @@ try_compile(HAVE_GCC_DEPRECATED_ATTR ${PROJECT_BINARY_DIR}
             ${PROJECT_SOURCE_DIR}/cmake/check_deprecated_attribute.cpp
             COMPILE_DEFINITIONS -DTRY_GCC_ATTR
             OUTPUT_VARIABLE OUTPUT)
-try_compile(HAVE_MSVC_DEPRECATED_ATTR ${PROJECT_BINARY_DIR}
-            ${PROJECT_SOURCE_DIR}/cmake/check_deprecated_attribute.cpp
-            COMPILE_DEFINITIONS -DTRY_MSVC_ATTR
-            OUTPUT_VARIABLE OUTPUT)
 
 configure_file(${PROJECT_SOURCE_DIR}/cmake/hsCompilerSpecific.h.cmake
                ${PROJECT_BINARY_DIR}/hsCompilerSpecific.h)

cmake/check_deprecated_attribute.cpp

@@ -4,8 +4,6 @@
 [[deprecated("derp_func is deprecated -- use func instead")]]
 #elif defined(TRY_GCC_ATTR)
 __attribute__((deprecated("derp_func is deprecated -- use func instead")))
-#elif defined(TRY_MSVC_ATTR)
-__declspec(deprecated("derp_func is deprecated -- use func instead"))
 #else
 #   error "DERP"
 #endif

cmake/hsCompilerSpecific.h.cmake

@@ -50,6 +50,5 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 #cmakedefine HAVE_CXX14_DEPRECATED_ATTR
 #cmakedefine HAVE_GCC_DEPRECATED_ATTR
-#cmakedefine HAVE_MSVC_DEPRECATED_ATTR
 
 #endif