Added warning messages when using GLM_FORCE_CXX** but the compiler is known to not fully support the requested C++ version #555

Author: Groovounet

glm/detail/setup.hpp

@@ -142,16 +142,24 @@
 #define GLM_LANG_CXXGNU			GLM_LANG_CXXGNU_FLAG
 
 #if defined(GLM_FORCE_CXX14)
-#	undef GLM_FORCE_CXX11
-#	undef GLM_FORCE_CXX03
-#	undef GLM_FORCE_CXX98
+#	if((GLM_COMPILER & GLM_COMPILER_GCC) && (GLM_COMPILER <= GLM_COMPILER_GCC50)) || ((GLM_COMPILER & GLM_COMPILER_CLANG) && (GLM_COMPILER <= GLM_COMPILER_CLANG34))
+#			pragma message("GLM: Using GLM_FORCE_CXX14 with a compiler that doesn't fully support C++14")
+#	elif GLM_COMPILER & GLM_COMPILER_VC
+#			pragma message("GLM: Using GLM_FORCE_CXX14 but there is no known version of Visual C++ compiler that fully supports C++14")
+#	elif GLM_COMPILER & GLM_COMPILER_INTEL
+#			pragma message("GLM: Using GLM_FORCE_CXX14 but there is no known version of ICC compiler that fully supports C++14")
+#	endif
 #	define GLM_LANG GLM_LANG_CXX14
 #elif defined(GLM_FORCE_CXX11)
-#	undef GLM_FORCE_CXX03
-#	undef GLM_FORCE_CXX98
+#	if((GLM_COMPILER & GLM_COMPILER_GCC) && (GLM_COMPILER <= GLM_COMPILER_GCC48)) || ((GLM_COMPILER & GLM_COMPILER_CLANG) && (GLM_COMPILER <= GLM_COMPILER_CLANG33))
+#			pragma message("GLM: Using GLM_FORCE_CXX11 with a compiler that doesn't fully support C++11")
+#	elif GLM_COMPILER & GLM_COMPILER_VC
+#			pragma message("GLM: Using GLM_FORCE_CXX11 but there is no known version of Visual C++ compiler that fully supports C++11")
+#	elif GLM_COMPILER & GLM_COMPILER_INTEL
+#			pragma message("GLM: Using GLM_FORCE_CXX11 but there is no known version of ICC compiler that fully supports C++11")
+#	endif
 #	define GLM_LANG GLM_LANG_CXX11
 #elif defined(GLM_FORCE_CXX03)
-#	undef GLM_FORCE_CXX98
 #	define GLM_LANG GLM_LANG_CXX03
 #elif defined(GLM_FORCE_CXX98)
 #	define GLM_LANG GLM_LANG_CXX98

readme.md

@@ -55,6 +55,8 @@ glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 ##### Improvements:
 - Added Visual C++ 15 detection
 - Added Clang 4.0 detection
+- Added warning messages when using GLM_FORCE_CXX** but the compiler
+  is known to not fully support the requested C++ version #555
 - Refactored GLM_COMPILER_VC values
 
 ##### Fixes: