Closes: #19967

Combine `--repeat-until-fail`, `--repeat-until-pass`, and
`--repeat-after-timeout` to create a single `--repeat <mode>:<n>`
option.  Retain `--repeat-until-fail` too because that has been
available in previous releases.

Fixes: #19970

Move them all under `Tests/ObjC` and `Tests/ObjCXX`.

The test for cm::optional assumed that *opt would return a reference
to a non-constructed object if opt.has_value() is false. However, on
certain systems that build CMake with flags to harden the build,
this condition aborts rather than returning the invalid reference.
Fix this by getting the reference only when the cm::optional is
known to actually have a value.

Fixes: #19964

In commit da5ac4bb (cpack: Add `CPACK_INSTALL_CMAKE_CONFIGURATIONS`
variable, 2019-07-10, v3.16.0-rc1~165^2) we added support for running
the `cpack -C ...` command-line with multiple configurations.  Add an
explicit test for this.

Fixes: #19918

In commit da5ac4bb (cpack: Add `CPACK_INSTALL_CMAKE_CONFIGURATIONS`
variable, 2019-07-10, v3.16.0-rc1~165^2) we added both the variable
and support for `cpack -C` with multiple configurations.  Drop the
variable because the `package` target cannot ensure that all of the
configurations are built.  Keep the command-line interface so that
it can be used manually in scripts.

Fixes: #19918

Fixes: #19936

Do not expect PCH-included definitions for this compiler.

Fixes: #19946
Fixes: #19947
Co-authored-by: Craig Scott <craig.scott@crascit.com>

Fixes: #19952

Fixes: #19920

With the 10.x release, PostgreSQL upstream started encoding the version
as `MMmmmm` where `M` is major and `m` is minor. Prior to that, `MMmmPP`
was used where `P` was the patch number. Detect this difference and
decode it based on the used encoding.

Fixes: #19912

There is no reason to skip the generated files, in case of problems
one can use the SKIP_UNITY_BUILD_INCLUSION property.

Fixes: #19925

- fix the typo in `foreach` documentation
- fix broken `foreach(... IN ITEMS ... LISTS ...)`
- add tests of `foreach` for existed functionality and fixes

Refactoring in commit 2d888e33 (cmSourceFile: Rename mutating
GetFullPath() overload, 2019-08-29, v3.16.0-rc1~160^2) accidentally left
the paths to `CMakeLists.txt` files empty in generated Xcode project
files.

Fixes: #19927

Also includes variants like hw -> res

Only changes the user-visible effects of renaming hardware
allocation to resource allocation. Code changes are the minimum
needed to achieve that.

The `PROCESSES` test property name added for CMake 3.16 is too close to
the existing `PROCESSORS` test property.  Furthermore, the property in
principle specifies groups of resources organized in a way that is
meaningful to a particular test.  The groups may often correspond to
processes but they could have other meanings.  Since the property name
`PROCESSES` has not been in a final 3.16 release yet, simply rename it
to `RESOURCE_GROUPS`.

Fixes: #19914

With the 10.x release, PostgreSQL upstream started encoding the version
as `MMmmmm` where `M` is major and `m` is minor. Prior to that, `MMmmPP`
was used where `P` was the patch number. Detect this difference and
decode it based on the used encoding.

Fixes: #19912

Fixes: #19769

A case added by commit 39ac8b4e (ctest: Add --repeat-after-timeout
option, 2019-10-29) includes a success-case timeout of 2 seconds.  That
is too short when running under valgrind, so extend it to 5 seconds.

Closes #19638.
Co-Authored-By: Craig Scott <craig.scott@crascit.com>

Fixes: #19909

These are not useful in nightly testing.

Add an option to re-run tests if they timeout.  This will help tolerate
sporadic timeouts on busy machines.

Add an option to re-run tests if they fail.  This will help tolerate
sporadic failures.

Issue: #17010
Co-Author: Ben Boeckel <ben.boeckel@kitware.com>
Co-Author: Chuck Atkins <chuck.atkins@kitware.com>

Clang scan-build 7 reports:

```
Tests/CMakeLib/testUTF8.cxx:12:3: warning: 4th function call argument is an uninitialized value
  printf("[0x%02X,0x%02X,0x%02X,0x%02X]", static_cast<int>(d[0]),
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
```

Manual tracing of all call sites shows that all values are initialized.

macOS/Xcode no longer populate /usr/include.
Building with the compiler directly instead of using /usr/bin/c++
can result in missing headers without the -isysroot flag.

Relates: #19885

This fixes two errors: not accounting for the trailing null and a
misunderstanding of what std::numeric_limits::digits10 means.