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Run clang-tidy's readability-redundant-string-cstr checker.
Ignore findings in kwsys.

Use clang-tidy's performance-unnecessary-copy-initialization checker.
After applying the fix-its (which turns the copies into const&), revise
the changes and see whether the copies can be removed entirely by using
the original instead.

Use clang-tidy's performance-unnecessary-value-param checker to find
value parameter declarations of expensive to copy types that are not
modified inside the function.  Ignore findings in kwsys.
After applying the fix-its, manually change `const T&` to `T const&`.

Teach cmVariableWatch::AddWatch to own the Pair it allocates until
it needs to pass ownership to WatchMap.

Add a `CMAKE_TRY_COMPILE_PLATFORM_VARIABLES` variable to specify a list
of custom variables to be forwarded to a `try_compile` test project.
This will be useful for platform information modules or toolchain files
to forward some platform-specific set of variables from the host project
(perhaps set in its cache) to the test project so that it can build the
same way.

De-duplicate the logic that constructs the cmake `-D` flag used to pass
variables into the test project cache.  Also subsume variables that were
propagated by generating `set()` commands in the project and pass them
as cache entries instead.

Create a `CMAKE_<LANG>_STANDARD_INCLUDE_DIRECTORIES` variable to specify
system include directories for for `<LANG>` compiler command lines.
This plays a role for include directories as the existing
`CMAKE_<LANG>_STANDARD_LIBRARIES` variable does for link libraries.

Daniel Pfeifer authored May 19, 2016 and Brad King committed May 25, 2016

Mostly automated:

values=("RelativeRoot" "NONE" "FULL" "HOME" "START" "HOME_OUTPUT" "START_OUTPUT"
        "OutputFormat" "UNCHANGED" "MAKERULE" "SHELL" "WATCOMQUOTE" "RESPONSE"
        "FortranFormat" "FortranFormatNone" "FortranFormatFixed" "FortranFormatFree")
for i in "${values[@]}"; do git grep -l cmLocalGenerator::$i | xargs sed -i "s|cmLocalGenerator::$i|cmOutputConverter::$i|g"; done

Apply fix-its from clang-tidy's performance-faster-string-find checker.
Ignore findings in kwsys.

Find uses of `cmSystemTools::ReplaceString` where both `replace` and
`with` are string literals with a size of one.

Automate with:

git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\2', '\3');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\\\\\\\\\");|std::replace(\1.begin(), \1.end(), '\2', '\\\\\\\\');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\\\\\\\\\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\\\\\\\\', '\2');|g"

Also, prefer the character overload.

Do not bother looping over all targets if we have no system include
directories to add anyway.

All generators use cmLocalGenerator::GetIncludeDirectories to construct
the final list of include directories for a target.

This patch preserves backward compatibility of
deb package names with previous CMake versions
but similarly to CPack/RPM allows to change
package name format and supports DEB-DEFAULT
setting that produces proper Debian package names.

Avoid using a KWSys RegularExpression to search for RPATH substrings.
It cannot handle large expressions.

Konstantin Podsvirov authored May 17, 2016 and Brad King committed May 18, 2016

Add support for this feature added by QtIFW 2.0.3:

  http://doc.qt.io/qtinstallerframework/ifw-updates.html

Add a `cpack_ifw_update_repository` command as porcelain.