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try_compile: Add policy CMP0066 to honor CMAKE_<LANG>_FLAGS_<CONFIG>

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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This change was originally made by commit v3.6.0-rc1~160^2 (try_compile: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.
This commit is contained in:
Brad King
2016-06-28 15:10:18 -04:00
parent 8d79375818
commit d582c23a47
11 changed files with 166 additions and 1 deletions
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2
Help/variable/CMAKE_POLICY_WARNING_CMPNNNN.rst
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@@ -15,6 +15,8 @@ warn by default:
policy :policy:`CMP0060`.
* ``CMAKE_POLICY_WARNING_CMP0065`` controls the warning for
policy :policy:`CMP0065`.
* ``CMAKE_POLICY_WARNING_CMP0066`` controls the warning for
policy :policy:`CMP0066`.
This variable should not be set by a project in CMake code. Project
developers running CMake may set this variable in their cache to