Revert commit v3.8.0-rc1~305^2 (Remove CTestTestfile.cmake when BUILD_TESTING
is OFF, 2016-11-14) again.  We reverted it once in commit v3.8.0-rc3~22^2
(Revert "Remove CTestTestfile.cmake when BUILD_TESTING is OFF", 2017-03-06) but
it was accidentally restored by commit v3.11.0-rc1~387^2 (server: add
"ctestInfo" request to get test info, 2017-10-25), perhaps due to conflict
resolution during rebase.

We cannot remove `CTestTestfile.cmake` when testing is off because it breaks
projects that never enable testing but create their own `CTestTestfile.cmake`
manually instead.  Revert the change again and add a test case.

Merge-request: !1867

The change in commit v3.11.0-rc1~306^2 (FindQt4: Set PLUGINS and IMPORTS
dir even if empty, 2017-11-19) regressed existing builds on some
machines.  Revert it for CMake 3.11 pending further investigation.

Fixes: #17814, #17817
Issue: #14155, #17492

Merge-request: !1855

Merge-request: !1851

Features recorded by commit v3.6.0-rc1~120^2~5 (Features: Record
standards and features for Intel C++ on UNIX, 2016-04-28) for the Intel
compiler left out initializer list support because our test case in
`Tests/CompileFeatures/cxx_generalized_initializers.cpp` caused an
internal compiler error.  It turns out this is because the Intel
compiler asserts the `initializer_list` constructor signatures to verify
that they match its own `<initializer_list>` header.  It was our dummy
implementation used to test the language feature without any headers
that caused the ICE.  Revise it to use a constructor signature accepted
by the Intel compiler.

Fixes: #17829

Craig Scott authored Mar 15, 2018 and Brad King committed Mar 15, 2018

In gtest_discover_tests(), the TIMEOUT keyword was making it
impossible to set the TIMEOUT test property via the PROPERTIES
keyword. This would be a frequent case, but it doesn't complain
and instead silently does something different to what would
normally be expected. The TIMEOUT keyword has been renamed
to DISCOVERY_TIMEOUT, thereby removing the clash.

This is a breaking change. 3.10.1 and 3.10.2 were the only versions
that supported the TIMEOUT keyword and uses of it were likely
not working as intended.

Fixes: #17801

Merge-request: !1854

The IBM XL C compiler does not define `__STDC__` when invoked as plain
`cc` instead of `xlc`, so `CMAKE_C_STANDARD_COMPUTED_DEFAULT` does not
get set and CMake fails.  Teach CMake about the XL compiler's default C
standard in this case.

Fixes: #17649

Merge-request: !1853

Merge-request: !1844

Merge-request: !1836

Tianhao Chai authored Mar 09, 2018 and Brad King committed Mar 13, 2018

A mistyped length calculation will memset across stack frame when
the user's terminal width is larger than 270.

Merge-request: !1838

When evaluating include directories during export to a `try_compile`
test project, thread the compile language through to the generator
expression evaluator so it can support `$<COMPILE_LANGUAGE:...>`.

Issue: #17811

When evaluating `INTERFACE_SYSTEM_INCLUDE_DIRECTORIES`, or evaluating
`INTERFACE_INCLUDE_DIRECTORIES` on an imported target, thread the
compile language through to the generator expression evaluator so
that it can support `$<COMPILE_LANGUAGE:...>`.

Fixes: #17811

Merge-request: !1839

Kai Wolf authored Mar 11, 2018 and Brad King committed Mar 12, 2018

Since commit v3.11.0-rc1~433^2~2 (Teach target_* commands to set
INTERFACE properties of IMPORTED targets, 2017-09-18) it is now possible
to use the customary `target_*` commands for adjusting the settings of
an IMPORTED target.  Update documentation accordingly.

Merge-request: !1831

The nvcc compiler does not support `@<rspfile>` arguments.  It does
offer a `--options-file` argument that can be investigated later.

Fixes: #17797

Merge-request: !1830

* upstream-KWSys:
  KWSys 2018-03-07 (2ad561e7)

Kitware Robot authored Mar 07, 2018 and Brad King committed Mar 07, 2018

Code extracted from:

    https://gitlab.kitware.com/utils/kwsys.git

at commit 2ad561e78b0d99f083f1213e403d5a8a90e0e134 (master).

Upstream Shortlog
-----------------

Brad King (4):
      6e190d9a Fix include directory usage requirement for build tree
      6d4e9fde SystemInformation: Android has no getifaddrs prior to API 24
      0a0974d0 SystemTools: Restore unconditional caching in GetActualCaseForPath
      a241fd13 SystemTools: Remove caching from public GetActualCaseForPath

Merge-request: !1825

Sebastian Holtermann authored Mar 06, 2018 and Brad King committed Mar 06, 2018

Calling `std::string::front()` on an empty string results
in an undefined behavior by the C++ standard.
In gcc8 it causes an assertion to fail.

This adds a check to `AUTOGEN` if a file to read is empty
and in case avoids the use of an empty `std::string` buffer.

Closes #17793

Merge-request: !1820

IBM XL C/C++ for Linux versions 13.1.6 and above no longer define
`__IBMC__` or `__IBMCPP__` by default (see `-qxlcompatmacros`).
Instead `__ibmxl__` now identifies the compiler along with some
related new version macros.

Fixes: #17784

Merge-request: !1802

Refactoring in commit v3.11.0-rc1~293^2~4 (Modules: Remove paths set as
global Unix prefixes, 2017-11-20) removed `PATH_SUFFIXES` options that
appeared to be used to cover subdirectories of the `PATHS` options that
were also removed.  However, the path suffixes also apply to other
search paths and so should not be removed.  Restore them.

Fixes: #17760

Merge-request: !1800

Bernhard M. Wiedemann authored Feb 26, 2018 and Brad King committed Feb 26, 2018

The test was expecting timestamps on day 1 in 1970 to start at 86400 but
they actually started at 0.  This worked without `SOURCE_DATE_EPOCH=1`
because after 1972, leap days compensated the offset.

Fixes: #17762

Merge-request: !1790

In case CMAKE_XCODE_GENERATE_TOP_LEVEL_PROJECT_ONLY has been enabled
generate only the root-level ZERO_CHECK target so targets in
subdirectories pick up the root generator target of ZERO_CHECK.

For the case that CMAKE_XCODE_GENERATE_TOP_LEVEL_PROJECT_ONLY is not
enabled more investigation and a proper and final fix is still needed.

Issue: 14297

Merge-request: !1789

Some environments require linking to thread libraries for `std::thread`.
Express this direct dependency of CMakeLib explicitly.  Previously this
was done indirectly through our bundled libuv, but that does not work
when using a system libuv.

Fixes: #17757