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| author | Brad King <brad.king@kitware.com> | 2016-06-28 15:10:18 -0400 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2016-06-29 09:11:02 -0400 |
| commit | d582c23a47ceef09e80435d6b986e3938f7f1521 (patch) | |
| tree | 38017f215c6e7b0e31f29b9c29559f4502d92a82 /Help/policy | |
| parent | 8d79375818efbaa06858a8e2d176ab8a251bef63 (diff) | |
| download | cmake-d582c23a47ceef09e80435d6b986e3938f7f1521.tar.gz | |
try_compile: Add policy CMP0066 to honor CMAKE_<LANG>_FLAGS_<CONFIG>
In the `try_compile` source file signature we propagate the caller's
value of `CMAKE_<LANG>_FLAGS` into the test project. Extend this to
propagate `CMAKE_<LANG>_FLAGS_<CONFIG>` too instead of always using the
default value in the test project. This will be useful, for example, to
allow the MSVC runtime library to be changed (e.g. `-MDd` => `-MTd`).
However, some projects may currently depend on this not being done,
so we need to activate the behavior using a policy.
This change was originally made by commit v3.6.0-rc1~160^2 (try_compile:
Honor CMAKE_<LANG>_FLAGS_<CONFIG> changes, 2016-04-11) but without the
policy and so had to be reverted during the 3.6 release candidate cycle.
Fixes #16174.
Diffstat (limited to 'Help/policy')
| -rw-r--r-- | Help/policy/CMP0066.rst | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Help/policy/CMP0066.rst b/Help/policy/CMP0066.rst new file mode 100644 index 0000000000..d1dcb0ec6c --- /dev/null +++ b/Help/policy/CMP0066.rst @@ -0,0 +1,27 @@ +CMP0066 +------- + +Honor per-config flags in :command:`try_compile` source-file signature. + +The source file signature of the :command:`try_compile` command uses the value +of the :variable:`CMAKE_<LANG>_FLAGS` variable in the test project so that the +test compilation works as it would in the main project. However, CMake 3.6 and +below do not also honor config-specific compiler flags such as those in the +:variable:`CMAKE_<LANG>_FLAGS_DEBUG` variable. CMake 3.7 and above prefer to +honor config-specific compiler flags too. This policy provides compatibility +for projects that do not expect config-specific compiler flags to be used. + +The ``OLD`` behavior of this policy is to ignore config-specific flag +variables like :variable:`CMAKE_<LANG>_FLAGS_DEBUG` and only use CMake's +built-in defaults for the current compiler and platform. + +The ``NEW`` behavior of this policy is to honor config-specific flag +variabldes like :variable:`CMAKE_<LANG>_FLAGS_DEBUG`. + +This policy was introduced in CMake version 3.7. Unlike most policies, +CMake version |release| does *not* warn by default when this policy +is not set and simply uses OLD behavior. See documentation of the +:variable:`CMAKE_POLICY_WARNING_CMP0066 <CMAKE_POLICY_WARNING_CMP<NNNN>>` +variable to control the warning. + +.. include:: DEPRECATED.txt |