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In commit v3.4.0-rc1~18^2 (Disable shared library support when compiler
links statically, 2015-09-30) we tried to detect when the compiler is
not capable of linking shared libraries (possibly due to flags in use).
However, the approach is not robust against flags like `-nostdlib`.
Revert it for now pending another solution to the original problem.

When a user or a compiler wrapper adds '-static' to the compiler flags
then it will always link static binaries.  Detect this from the compiler
id binary and disable TARGET_SUPPORTS_SHARED_LIBS.  This will prevent
projects from accidentally adding shared libraries when the toolchain
does not support them.  It also helps CMake avoid linking with flags
that require shared libraries to be supported.

Instead of always adding CMAKE_SHARED_LIBRARY_LINK_<LANG>_FLAGS to
executables, or just when the ENABLE_EXPORTS property is set (CMP0065),
make sure that the target platform also actually supports shared
libraries.  If not, then the executable cannot possibly provide symbols
to them anyway.

0429c384 Help: Add notes for topic 'FindOpenSSL-imported-targets'

def90d5f Merge branch 'upstream-kwsys' into update-kwsys
cc144ebf KWSys 2015-09-28 (2089567a)

Extract upstream KWSys using the following shell commands.

$ git archive --prefix=upstream-kwsys/ 2089567a | tar x
$ git shortlog --no-merges --abbrev=8 --format='%h %s' dc4e4a55..2089567a
Vitaly Baranov (1):
      2089567a SystemTools: Fix GetPath to not affect existing output vector entries

fa5284f0 VS: Prevent generated "rule" files from causing rebuilds

9bc6eb8e cmGlobalGenerator: Initialize generator targets on construction (#15729)

1fe39020 QtAutogen: Port away from cmLocalGenerator.
59a729b2 QtAutogen: Split initializer class into separate file.
1e83a963 QtAutogen: Split initializer methods into separate class.
12f0e13c QtAutogen: Simplify generator initialization API.
65ff75d3 QtAutogen: Remove unnecessary dereference.
64b78c14 QtAutogen: Move Source initialization to prior loop.
c3c20d3c QtAutogen: Add _automoc.cpp sources before initializing.
8b6ec29d QtAutogen: Move initialization condition to caller.
9470b056 QtAutogen: Move condition to prior loop.
b7491b1c QtAutogen: Move condition to prior loop.
e791c854 QtAutogen: Make some methods static.
6210ec64 QtAutogen: Make internal method private.
a3ceb998 QtAutogen: Don't use members to initialize automoc targets.
dced2fe1 QtAutogen: Rename variable.
f9a77e76 QtAutogen: Don't use a member to store skipped uic files.
c3633e7a QtAutogen: Add missing includes and forward declarations.

9298f56d CPack: allow packaging of empty directories
ecd71c9c SystemTools: time operations on directories
19c6f4ee SystemTools: set time file permissions
749a140a CPackDeb: allow empty directories in component packages

1ff96bf6 ProcessorCount: Implement with psrinfo tool on recent SunOS versions

da7276cf Replace http://www.cmake.org URLs with https://cmake.org

The Ninja generator and Visual Studio generators are special-cased for the
QtAutogen feature.  In order to reduce the number of custom targets, the Visual
Studio generators prefer to create custom commands instead, and in order to
create appropriate Ninja files, generated rcc files are listed as byproducts.

This requires the use of the GetConfigCommonSourceFiles API of the
cmGeneratorTarget for those generators when initializing the autogen target.
The initializer method is called from Compute() after the cmGeneratorTarget
objects are created, however the initialization of the object directory occurs
later in the InitGeneratorTargets method.  That means that the resulting object
locations are computed incorrectly and cached before the object directory is
determined, so the generated buildsystem can not find the object files.

The initialization of the object directory was split from the creation of
cmGeneratorTarget instances in commit 0e0258c8 (cmGlobalGenerator: Split
creation of generator object from initialization., 2015-07-25).  The motivation
for the split was to do only what is essential to do early in cases where
cmGeneratorTargets need to be created at configure-time.  That is required for
the purpose of implementing policies CMP0024 and CMP0026, and for
try_compile(LINK_LIBRARIES).  However, the split was not really necessary.

Compute the object directory in the cmGeneratorTarget constructor instead.

The QtAutogen unit test already tests the use of TARGET_OBJECTS with AUTOMOC,
and that test already passes on Ninja.  The reason it already passes is that
the QtAutogen target also uses the AUTORCC feature, and specifies several qrc
files in its SOURCES.  Later in the Compute algorithm (after the
InitGeneratorTargets call), the rcc files are determined and target->AddSource
is called.  The AddSource call clears the previously mentioned cache of source
files, causing it to be regenerated when next queried, this time taking account
of the object directory.

Extend the test suite with a new target which does not make use of AUTORCC with
qrc files so that the test added alone would break without the fix in this
commit.

On windows FILE_FLAG_BACKUP_SEMANTICS enables us to
read/write time both on files and directories.

On Windows if file permissions are read only
FILE_WRITE_ATTRIBUTES will enables us to
get file handle and change file time.

When we generate a ".rule" file to attach a custom command in a VS IDE
project, set the file timestamp to be old enough to prevent the rule
from re-running due to its timestamp.

51e48637 VS: Remove impossible condition.
203eada6 cmMakefile: Remove Configured state.
5642449a cmCommand: Remove IsDiscouraged interface.
77c6a339 cmSetCommand: Re-use local named variable.
732f5511 cmSetCommand: Fix typo in comment.
8544f16d cmGlobalGenerator: Devirtualize method.
9096daaf Ninja: Remove unused variable.

256c78ad Build: Set CMP0053 to NEW.

bc3e1e4b Tests: Add case for -Wdev and -Wno-dev with non-message() warnings (#15747)

946e8615 Merge branch 'upstream-kwsys' into update-kwsys
29ad0694 KWSys 2015-09-25 (dc4e4a55)

6e2a4087 Ninja: Centralize path conversion in global generator (#15757)
993d0641 Ninja: Fix OBJECT_DIR placeholder substitution in link rules

4eb77a1c Tests: Use C-Style comments in C sources and headers

ca6ba3fe Genex: Add a SHELL_PATH expression
7de868c4 Tests: Simplify GeneratorExpression check implementation

67040500 Tests: Fix RunCMake.BuildDepends filesystem delay for Borland Makefiles

a7fe4413 jsoncpp: Add missing cast to convert from char to UInt

Some commands on Windows do not understand forward slash paths and
require backslashes.  In order to help projects generate shell
invocations of such commands, provide a generator expression to convert
paths to the shell-preferred path format for the current generator.
This will allow custom commands to generate paths the same way CMake
does for compiler command invocations.

It is vestigial.

This used to affect documentation, but does not affect the Sphinx
documentation.