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e9976c8827
Explain that this represents the compiler's default and mustn't be modified by the user. Clarify when it's used as the default. Additionally: * Add a reference to it in cmake-compile-features in text explaining the feature. * Add explanations for the default initialization by `CMAKE_<LANG>_EXTENSIONS_DEFAULT` to all `<LANG>_EXTENSIONS` pages and references to CMP0128. * Slightly reduce the wordiness of the default initialization explanations by removing an unnecessary "it is". Fixes #22828.
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799 B
ReStructuredText
25 lines
799 B
ReStructuredText
<LANG>_EXTENSIONS
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-----------------
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The variations are:
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* :prop_tgt:`C_EXTENSIONS`
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* :prop_tgt:`CXX_EXTENSIONS`
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* :prop_tgt:`CUDA_EXTENSIONS`
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* :prop_tgt:`HIP_EXTENSIONS`
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* :prop_tgt:`OBJC_EXTENSIONS`
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* :prop_tgt:`OBJCXX_EXTENSIONS`
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These properties specify whether compiler-specific extensions are requested.
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These properties are initialized by the value of the
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:variable:`CMAKE_<LANG>_EXTENSIONS` variable if it is set when a target is
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created and otherwise by the value of
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:variable:`CMAKE_<LANG>_EXTENSIONS_DEFAULT` (see :policy:`CMP0128`).
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For supported CMake versions see the respective pages.
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To control language standard versions see :prop_tgt:`<LANG>_STANDARD`.
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See the :manual:`cmake-compile-features(7)` manual for information on
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compile features and a list of supported compilers.
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