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Because cmake_parse_arguments() has been implemented as a native
command, there is no need to include(CMakeParseArguments) anymore.
Its inclusion has been removed from several CMake modules.
Tests/CMakeOnly/CMakeLists.txt has been changed to include the
*building* CMake's copy of CMakeParseArguments rather than the
*built* CMake's copy. This file included the *built* copy because
when this file was introduced, CMake could still be built with versions
that didn't supply cmake_parse_arguments(). Now, CMake requires 3.1 or
greater, where cmake_parse_arguments() existed but was still in the
form of a module, so we include it from the *building* CMake.
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Add IPO support for Visual Studio (which is referred to by VS as
"Link Time Code Generation" and "Whole Program Optimization"), for
VS version >= 10. This allows CMake/VS users to enable IPO by setting
property `INTERPROCEDURAL_OPTIMIZATION`.
Fixes: #16748
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Avoid passing the output of our `try_compile` through a macro argument.
Macro invocations re-parse their arguments and so should not be given
arbitrary content that may contain backslashes and such.
Instead pass a simple message. This is also more readable in the case
that the macro generates a message itself. After the macro returns,
report the real output directly to the variable named by our caller.
Also record the output in a log file as other checks do on failure.
Fixes: #18244
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Simplify the test for whether a `RESULT` argument was given to the
`check_ipo_supported` call. Also do not set an empty variable name
if `OUTPUT` was not given.
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Support was added by commit v3.9.0-rc1~318^2 (CheckIPOSupported: Add
Fortran support, 2017-04-02) but the documentation was not updated.
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We only define `INTERPROCEDURAL_OPTIMIZATION` behavior for C, CXX, and
Fortran languages. Do not try to enable support for other languages.
Furthermore, each language builds with a different compiler, so check
for support by CMake and the compiler for each language independently.
Fixes: #16944
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Previously the `INTERPROCEDURAL_OPTIMIZATION` target property was
honored only for the Intel compiler on Linux and otherwise ignored. In
order to add support for more compilers incrementally without changing
behavior in the future, add a new policy whose NEW behavior enforces the
`INTERPROCEDURAL_OPTIMIZATION` property. Add flags for supported
compilers and otherwise produce an error.
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