Disabling strict aliasing on GCC >= 4.8.

Causes failure of DebugToolsCylinderRendererTest without any warning,
only in release build, any attempt to add debug print results in issue
disappearing. Not an issue on Clang or GCC < 4.8.

src/CMakeLists.txt

@@ -29,6 +29,13 @@ if(CORRADE_GCC46_COMPATIBILITY)
     string(REPLACE "-pedantic" "" CORRADE_CXX_FLAGS "${CORRADE_CXX_FLAGS}")
 endif()
 
+# On 4.8.2 strict aliasing causes failure of DebugToolsCylinderRendererTest
+# without any warning, only in release build, any attempt to add debug print
+# results in issue disappearing. Not an issue on Clang or GCC < 4.8.
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND NOT "${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "4.8.0")
+    set(CORRADE_CXX_FLAGS "${CORRADE_CXX_FLAGS} -fno-strict-aliasing")
+endif()
+
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CORRADE_CXX_FLAGS}")
 include_directories(
     ${CMAKE_CURRENT_SOURCE_DIR}