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Compilers enable their extensions by default, and disabling them
implicitly can lead to results which are surprising or non-obvious
to debug.
http://public.kitware.com/pipermail/cmake-developers/2014-May/010575.html
http://thread.gmane.org/gmane.comp.programming.tools.cmake.devel/10214
https://www.mail-archive.com/cmake-developers@cmake.org/msg10116.html
(Compiler feature extensions by default, 29 May 2014)
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Link to it from the documentation of related properties, variables
and commands.
Extend the cmake-developer(7) documentation with notes on
extending feature support for compilers.
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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.
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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.
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