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In the WarnUnusedCliUnused test, the whole CMakeCache.txt was removed in the
clean stage to trigger the same CMake warning in re-builds. This technique
worked only in the Makefile generators and the test was limited to these.
Now only the variable of interest is removed from the cache by using a
`unset(UNUSED_CLI_VARIABLE CACHE)` statement in the CMakeLists.txt file.
This makes the WarnUnusedCliUnused test run on all generators
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Run the `Utilities/Scripts/clang-format.bash` script to update
all our C++ code to a new style defined by `.clang-format`.
Use `clang-format` version 3.8.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
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It is common to specify a CMAKE_TOOLCHAIN_FILE and get a warning
for using it despite it not being used.
The WarnUnusedCliUnused test relies on the warning being emitted
each time cmake is run on an existing build. That behavior is changed
by this patch to warn only on the first invokation of CMake, and not
on subsequent invokations (because the variable is in the cache with
the same value). For that test, a clean target is added which clears
the cache and cause the warning to be emitted each time.
As the Ninja generator does not support the feature needed to test
this, it is not tested with that generator.
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