C11 Support in Intel C++ Compiler

The following C11 features are supported by Intel(R) C++ compiler that comes with Intel® Parallel Studio XE and Intel® System Studio.

C11 Language FeatureVersion 15.0Version 16.0Version 17.0Version 18.0
Static AssertYesYesYesYes
Typedef redefinition-YesYesYes
Anonymous struct and union-YesYesYes
New macros in float.h-YesYesYes
_Alignas, _Alignof,max_align_t,stdalign.h-YesYesYes
_Atomic---Yes
Atomic operations-YesYesYes
Macros for Complex values-YesYesYes
Unicode strings-YesYesYes
uchar.h----
_Noreturn,stdnoreturn.h-YesYesYes
_Generic-YesYesYes
__STDC_VERSION__ == 201112L-YesYesYes
_thread_local-YesYesYes

Note:

1. The C11 features are only supported when GNU* gcc in path is 4.6 or higher.
2. On Linux: The C11 features supported by gcc on the path are enabled by default. Use "-std=c11" or "-std=c1x" to turn on the support for all other cases.
3. On macOS*: The C11 features supported by gcc on the path are enabled by default. Use "-std=c11" to turn on the support for all other cases.
4. On Windows: The C11 features can be enabled on Windows using "/Qstd=c11" compiler option

Other relevant articles:

GNU GCC C11 support status: https://gcc.gnu.org/wiki/C11Status 
GNU GCC C99 support status: https://gcc.gnu.org/c99status.html
Intel Compiler C99 support status: https://software.intel.com/en-us/articles/c99-support-in-intel-c-compiler

 

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