Merge branch 'fix-atomic-rename-Windows-sharing-violation' into release
CMake Nightly Date Stamp
cmCTestBuildAndTestHandler: Refactor local loop var
cmCTestBuildAndTestHandler: Refactor output capture

Use an RAII class to add and remove callbacks.
cmSystemTools: Rename ErrorCallback to MessageCallback

Clarify that it is the callback for the cmSystemTools::Message API.
Rename callback clients too.
cmSystemTools: Simplify InterruptCallback definition

Use the typedef to declare the member instead of duplicating the type.
Use default initialization instead of an explicit zero initializer.
cmSystemTools: Add callback for Stderr

Factor a common callback type out of StdoutCallback.  Add an equivalent
StderrCallback.  While at it, use "size_t" for the data length instead
of "int".

Teach "ctest --build-and-test" to capture the Stderr callback because
output sent through it is part of the logical CMake process output.
cmake-gui: Capture cmSystemTools::Stdout and Stderr

Output sent through these APIs is logically part of the CMake process
output.  Capture it with callbacks and display it in the cmake-gui
output window along with other messages.
execute_process: Send stderr through cmSystemTools::Stderr

Give cmake-gui and ctest --build-and-test a chance to capture the output
instead of sending it to the real stderr.
CTEST: Remove clear functions from GTM Coverage

Remove the calls to the "clear" function and replace with setting the
variables equals to an empty string.
Merge topic 'fix_mumps_coverage' into next

bf3d558d CTEST: Remove clear functions from GTM Coverage
Help: Add notes for topic 'cmake-gui-capture-output'
Merge topic 'cmake-gui-capture-output' into next

209cd475 Help: Add notes for topic 'cmake-gui-capture-output'
d7c69246 execute_process: Send stderr through cmSystemTools::Stderr
92ddf0c9 cmake-gui: Capture cmSystemTools::Stdout and Stderr
f52b5ae3 cmSystemTools: Add callback for Stderr
a9ae1d7a cmSystemTools: Simplify InterruptCallback definition
73b13f56 cmSystemTools: Rename ErrorCallback to MessageCallback
7577a542 cmCTestBuildAndTestHandler: Refactor output capture
b1b4d761 cmCTestBuildAndTestHandler: Refactor local loop var
Merge branch 'master' into next
Merge branch 'release'
Merge branch 'master' into next
Use the static string in the presence of optimization.
Merge topic 'minor-cleanups' into next

c2baaa06 Use the static string in the presence of optimization.
Features: Use the features symbol in the feature-test compile.

Clang discards the entire string if it is not used, removing
the ability to read the features from the compiled binary. That
is prevented by using the symbol.

GNU with -O3 also discards the string, so use the string in a
way which is determined by a runtime value (argc) to prevent
it being discarded.
Merge topic 'minor-cleanups' into next

f6f10954 Features: Use the features symbol in the feature-test compile.