```cmake
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED on)
set(CMAKE_CXX_EXTENSIONS off)
add_compile_options("$<$<CONFIG:DEBUG>:-DREALM_DEBUG>")
add_compile_options("$<$<CONFIG:COVERAGE>:-DREALM_DEBUG>")
add_compile_options(
    -DREALM_HAVE_CONFIG
    -Wall
    -Wextra
    -Wno-missing-field-initializers
    -Wempty-body
    -Wparentheses
    -Wunknown-pragmas
    -Wunreachable-code
)

if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
    add_compile_options(
        -Wassign-enum
        -Wbool-conversion
        -Wconditional-uninitialized
        -Wconstant-conversion
        -Wenum-conversion
        -Wint-conversion
        -Wmissing-prototypes
        -Wnewline-eof
        -Wshorten-64-to-32
    )
endif()

if(${CMAKE_GENERATOR} STREQUAL "Ninja")
    if(${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
    elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-color=always")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
    endif()
endif()
```

Fix compiler checks to match clang on OS X, which CMake labels AppleClang.
user
```cmake
set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED on)
set(CMAKE_CXX_EXTENSIONS off)
add_compile_options("$<$<CONFIG:DEBUG>:-DREALM_DEBUG>")
add_compile_options("$<$<CONFIG:COVERAGE>:-DREALM_DEBUG>")
add_compile_options(
    -DREALM_HAVE_CONFIG
    -Wall
    -Wextra
    -Wno-missing-field-initializers
    -Wempty-body
    -Wparentheses
    -Wunknown-pragmas
    -Wunreachable-code
)

if(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
    add_compile_options(
        -Wassign-enum
        -Wbool-conversion
        -Wconditional-uninitialized
        -Wconstant-conversion
        -Wenum-conversion
        -Wint-conversion
        -Wmissing-prototypes
        -Wnewline-eof
        -Wshorten-64-to-32
    )
endif()

if(${CMAKE_GENERATOR} STREQUAL "Ninja")
    if(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
    elseif(${CMAKE_CXX_COMPILER_ID} STREQUAL "GNU")
        set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fdiagnostics-color=always")
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fdiagnostics-color=always")
    endif()
endif()
```
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