Only for gcc is it misleading, clang is fine with release mode

Author: TrentHouliston

src/CMakeLists.txt

@@ -39,10 +39,10 @@ target_compile_features(nuclear PUBLIC cxx_std_14)
 
 option(ENABLE_COVERAGE "Compile with coverage support enabled.")
 if(ENABLE_COVERAGE)
-  if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
-    message(WARNING "Coverage is enabled but not build in debug mode. Coverage results may be misleading.")
-  endif()
   if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    if(NOT CMAKE_BUILD_TYPE STREQUAL "Debug")
+      message(WARNING "Coverage is enabled but not build in debug mode. Coverage results may be misleading.")
+    endif()
     target_compile_options(nuclear PUBLIC -fprofile-arcs -ftest-coverage -fprofile-abs-path -fprofile-update=atomic)
     target_link_options(nuclear PUBLIC -fprofile-arcs)
   elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")