How can I detect C 11 support in a compiler using CMake?

Detecting C 11 Support in a Compiler with CMake

Identifying Compiler Support

CMake version 3.1.0 onward provides CMAKE_CXX_COMPILE_FEATURES to identify C features supported by the compiler.

Specifying C Standard Explicitly

Set CXX_STANDARD and CXX_STANDARD_REQUIRED target properties to specify the desired standard:

<code class="cmake">add_executable(prog main.cc)
set_property(TARGET prog PROPERTY CXX_STANDARD 11)
set_property(TARGET prog PROPERTY CXX_STANDARD_REQUIRED ON)</code>

Specifying Required C Features

Use target_compile_features to specify specific C features and CMake will deduce the appropriate standard:

<code class="cmake">project(foobar CXX)
add_executable(foobar main.cc)
set(needed_features    # Specify the required C++ features used in the program
    cxx_strong_enums
    cxx_constexpr
    cxx_auto_type)
target_compile_features(foobar PRIVATE ${needed_features})</code>

Supported C Features

The following code lists the C features supported by your CMake version:

<code class="cmake">cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
get_property(known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
foreach(i ${known_features})
  message("${i}")
endforeach()</code>

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