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CMake/Help/prop_tgt/C_EXTENSIONS.rst

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Features: Extend concept to C language. 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.
2013-11-04 04:15:43 +04:00
C_EXTENSIONS
------------
Boolean specifying whether compiler specific extensions are requested.
This property specifies whether compiler specific extensions should be
used. For some compilers, this results in adding a flag such
Features: Enable compiler extensions by default. 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)
2014-05-30 17:03:45 +04:00
as ``-std=gnu11`` instead of ``-std=c11`` to the compile line. This
Help: Cross reference CXX_STANDARD and CXX_EXTENSIONS (#16162)
2016-06-25 15:23:56 +03:00
property is ``ON`` by default. The basic C standard level is
controlled by the :prop_tgt:`C_STANDARD` target property.
Features: Add missing variable reference in docs.
2014-05-22 11:41:13 +04:00
Help: Add a manual for compiler feature control. 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.
2014-03-19 02:50:18 +04:00
See the :manual:`cmake-compile-features(7)` manual for information on
Help: Document supported compilers in cmake-compile-features.7 Extend sentences in other documentation linking to this manual to say that it has a list of supported compilers. Co-Author: Brad King <brad.king@kitware.com>
2015-04-07 21:10:50 +03:00
compile features and a list of supported compilers.
Help: Add a manual for compiler feature control. 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.
2014-03-19 02:50:18 +04:00
Features: Add missing variable reference in docs.
2014-05-22 11:41:13 +04:00
This property is initialized by the value of
the :variable:`CMAKE_C_EXTENSIONS` variable if it is set when a target
is created.