Provide information about compatibility and ES 2.0 target to users.

modules/FindMagnum.cmake

@@ -65,11 +65,21 @@ find_path(MAGNUM_INCLUDE_DIR
 # Configuration
 file(READ ${MAGNUM_INCLUDE_DIR}/magnumConfigure.h _magnumConfigure)
 
-# Built for OpenGL ES?
+# Compatibility?
+string(FIND "${_magnumConfigure}" "#define MAGNUM_GCC46_COMPATIBILITY" _GCC46_COMPATIBILITY)
+if(NOT _GCC46_COMPATIBILITY EQUAL -1)
+    set(MAGNUM_GCC46_COMPATIBILITY 1)
+endif()
+
+# Built for specific target?
 string(FIND "${_magnumConfigure}" "#define MAGNUM_TARGET_GLES" _TARGET_GLES)
 if(NOT _TARGET_GLES EQUAL -1)
     set(MAGNUM_TARGET_GLES 1)
 endif()
+string(FIND "${_magnumConfigure}" "#define MAGNUM_TARGET_GLES2" _TARGET_GLES2)
+if(NOT _TARGET_GLES2 EQUAL -1)
+    set(MAGNUM_TARGET_GLES2 1)
+endif()
 
 if(NOT MAGNUM_TARGET_GLES)
     find_package(OpenGL REQUIRED)