CMake cleanup.

CMakeLists.txt

@@ -125,7 +125,7 @@ if(BUILD_TESTS)
 endif()
 
 # Check compiler compatibility
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND "${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "4.7.0")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS "4.7.0")
     message(FATAL_ERROR "Compatibility branch of Magnum is needed for use with GCC < 4.7. See the documentation for more information.")
 elseif(MSVC)
     message(FATAL_ERROR "Compatibility branch of Magnum is needed for use with MSVC. See the documentation for more information.")

src/MagnumExternal/OpenGL/GLES2/CMakeLists.txt

@@ -28,7 +28,7 @@ if(NOT CORRADE_TARGET_NACL AND NOT CORRADE_TARGET_EMSCRIPTEN)
     # flextGLPlatform.cpp is compiled as part of Magnum*Context libraries in Platform
     add_library(MagnumFlextGLObjects OBJECT flextGL.cpp)
 
-    if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
+    if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?Clang")
         set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "-fvisibility=hidden -DFlextGL_EXPORTS")
     else()
         set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "-DFlextGL_EXPORTS")

src/MagnumExternal/OpenGL/GLES3/CMakeLists.txt

@@ -26,7 +26,7 @@
 # flextGLPlatform.cpp is compiled as part of Magnum*Context libraries in Platform
 add_library(MagnumFlextGLObjects OBJECT flextGL.cpp)
 
-if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" OR "${CMAKE_CXX_COMPILER_ID}" MATCHES "(Apple)?Clang")
+if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "(Apple)?Clang")
     set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "-fvisibility=hidden -DFlextGL_EXPORTS")
 else()
     set_target_properties(MagnumFlextGLObjects PROPERTIES COMPILE_FLAGS "-DFlextGL_EXPORTS")