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* MSVC: Avoid unnecessary C++ feature detection stepsBrad King2017-09-121-0/+24
| | | | | | | | | | | Since commit v3.9.0-rc1~17^2~4 (Compilers: Port to use default cmake_record_lang_compile_features macros, 2017-05-10) we run full per-language-standard feature detection for MSVC. This is not necessary because the base mode for MSVC has all features we define except for the meta-features for C++14 and above. Override the default C++ feature detection macro for MSVC to run detection only once as before. Fixes: #17274
* MSVC: Extend C++ language standard support to Visual Studio 2015 Update 3Nils Gladitz2017-09-011-1/+4
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* MSVC: Add flags for C++ language standardsBrad King2017-07-171-1/+19
| | | | | | | | | | | Visual Studio 2015 Update 3 introduced the notion of language standard levels to MSVC. The language standard level is defined in `_MSVC_LANG` instead of `__cplusplus`. It also added support for the `-std:c++14` and `-std:c++latest` flags, although the compiler defaults to its C++14 mode anyway. Visual Studio 2017 Update 3 will introduce support for the `-std:c++17` flag. Fixes: #16482
* Compilers: Port to use default cmake_record_lang_compile_features macrosChuck Atkins2017-05-301-12/+2
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* MSVC: Add empty definitions for std compile optionsChuck Atkins2017-05-291-2/+16
| | | | | | There are no specific options for MSVC to set language standards, but set them as empty strings anyways so the feature test infrastructure can at least check to see if they are defined.
* Features: Add infrastructure for C++ 17 language standardBrad King2016-12-021-0/+1
| | | | Issue: #16468
* Features: Add meta-features requesting awareness of a particular standardBrad King2016-11-021-0/+5
| | | | | | | | | | A common use case of `target_compile_features` is simply to specify that the compiler should be run in a mode that is aware of e.g. C++11. Some projects simply specify a particular C++11-only feature to request this. Provide a first-class way to do this by naming features after the corresponding language standard. Record them as always available in the corresponding standard level so that requesting them always ensures that standard (or higher) is used.
* Features: Centralize per-compiler recording macrosBrad King2016-11-021-1/+1
| | | | | Simplify and de-duplicate per-compiler feature recording macros and convert to a centralized per-language macro.
* Features: Do not record features on MSVC < 2010Brad King2016-11-021-1/+3
| | | | | | | We have no feature tests for versions of VS older than 2010, so do not even call `record_compiler_features` for such versions. This is consistent with other compilers where we call this macro only for versions for which we have recorded features.
* Features: Populate CMAKE_<LANG>_STANDARD_DEFAULT only for supported compilers.Stephen Kelly2015-02-041-2/+5
| | | | | | If no compiler feature information is known for a given compiler version, do not set a language standard default either. The two settings must be recorded consistently.
* Features: Record for MSVC 2010-2015Robert Maynard2015-01-301-0/+6
Also, in WCDH add MSVC Compatibility for cxx_align{of,as}. Co-Author: Stephen Kelly <steveire@gmail.com> Co-Author: Brad King <brad.king@kitware.com>
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