How Can I Check for C 11 Compiler Support at Compile Time?

Detecting C 11 Support during Compilation

Question:

How can you determine at compile-time whether your compiler supports specific features of the C 11 standard?

Answer:

One reliable method is to use the __cplusplus constant, which C compilers should set to reflect the version of the standard they support. For example:

#if __cplusplus <= 199711L
  #error This library needs at least a C++11 compliant compiler
#endif

This code will generate an error if the compiler's C version is less than or equal to 199711L, indicating that C 11 support is not available.

However, some vendors may not update __cplusplus immediately after implementing partial C 11 support. In such cases, using Boost's defines is still recommended for granular detection of specific C 11 features.

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