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* Features: Extend concept to C language.Stephen Kelly2014-05-145-11/+73
| | | | | | | | | | | Add properties and variables corresponding to CXX equivalents. Add features for c_function_prototypes (C90), c_restrict (C99), c_variadic_macros (C99) and c_static_assert (C11). This feature set can be extended later. Add a <PREFIX>_RESTRICT symbol define to WriteCompilerDetectionHeader to conditionally represent the c_restrict feature.
* Tests: Execute compile features tests unconditionally.Stephen Kelly2014-04-171-0/+8
| | | | Conditionally create a dummy test if there are no known features.
* Add target_compile_features command.Stephen Kelly2014-04-076-0/+49
This can be used to set the compiler features required by particular targets. An error is issued at CMake time if the compiler does not support the required feature. If a language dialect flag is required by the features used, that will be added automatically. Base the target_compile_features command on cmTargetPropCommandBase. This gives us 'free' handling of IMPORTED, ALIAS, INTERFACE, non-compilable and missing targets.