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| author | Raul Tambre <raul@tambre.ee> | 2021-05-29 15:34:18 (GMT) |
|---|---|---|
| committer | Raul Tambre <raul@tambre.ee> | 2021-09-29 19:28:40 (GMT) |
| commit | 4a0485be7f4ab06201c478f5a46111ab1e8e773e (patch) | |
| tree | a4a89916f051e70a7fac32fbba0daaefbcc4ac0d /Help/manual | |
| parent | 29e2b8517126389b2c4b2f3479c4634a8260bea3 (diff) | |
| download | CMake-4a0485be7f4ab06201c478f5a46111ab1e8e773e.zip CMake-4a0485be7f4ab06201c478f5a46111ab1e8e773e.tar.gz CMake-4a0485be7f4ab06201c478f5a46111ab1e8e773e.tar.bz2 | |
cmStandardLevelResolver: Avoid unnecessary flags, fix unset level logic
The changes are part of CMP0128.
When the standard level is unset:
* Flags are added if extension mode doesn't match the compiler's default.
Previously logic only worked if LANG_EXTENSIONS was ON. Fixes #22224.
* The full flag is used. Previously CMAKE_LANG_EXTENSION_COMPILE_OPTION was
used. This was only supported for IAR.
Otherwise:
* Avoid adding flags if not necessary per the detected compiler defaults.
* Fixed check for when the requested standard is older. It now matches the
nearby comments.
I reworded the fallback comment as its logic was a bit difficult to wrap my
head around.
Diffstat (limited to 'Help/manual')
| -rw-r--r-- | Help/manual/cmake-compile-features.7.rst | 11 | ||||
| -rw-r--r-- | Help/manual/cmake-policies.7.rst | 1 |
2 files changed, 6 insertions, 6 deletions
diff --git a/Help/manual/cmake-compile-features.7.rst b/Help/manual/cmake-compile-features.7.rst index 2b0de11..a0459fa 100644 --- a/Help/manual/cmake-compile-features.7.rst +++ b/Help/manual/cmake-compile-features.7.rst @@ -118,14 +118,13 @@ as well as any dependents (that may include headers from ``mylib``). Availability of Compiler Extensions ----------------------------------- -Because the :prop_tgt:`CXX_EXTENSIONS` target property is ``ON`` by default, -CMake uses extended variants of language dialects by default, such as -``-std=gnu++11`` instead of ``-std=c++11``. That target property may be -set to ``OFF`` to use the non-extended variant of the dialect flag. Note -that because most compilers enable extensions by default, this could -expose cross-platform bugs in user code or in the headers of third-party +The :prop_tgt:`<LANG>_EXTENSIONS` target property defaults to the compiler's +efault. Note that because most compilers enable extensions by default, this +may expose cross-platform bugs in user code or in the headers of third-party dependencies. +:prop_tgt:`<LANG>_EXTENSIONS` used to default to ``ON``. See :policy:`CMP0128`. + Optional Compile Features ========================= diff --git a/Help/manual/cmake-policies.7.rst b/Help/manual/cmake-policies.7.rst index 0f0c0ab..3df4f9f 100644 --- a/Help/manual/cmake-policies.7.rst +++ b/Help/manual/cmake-policies.7.rst @@ -57,6 +57,7 @@ Policies Introduced by CMake 3.22 .. toctree:: :maxdepth: 1 + CMP0128: Selection of language standard and extension flags improved. </policy/CMP0128> CMP0127: cmake_dependent_option() supports full Condition Syntax. </policy/CMP0127> Policies Introduced by CMake 3.21 |