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The cmGetPropertyCommand::StoreResult expects NULL for unset
properties. Make ALIASED_TARGET align with that expectation.

Additional corrections to the unit tests are necessary because
get_property removes variables for unset properties (in contrast
to get_target_property which stores a -NOTFOUND value).

8a98cf64 Honor CMAKE_*_LINKER_FLAGS[_<CONFIG>]_INIT set in toolchain files
37d15c39 MSVC: Set all CMAKE_*_LINKER_FLAGS_INIT directly
55c884ed Embarcadero: Set all CMAKE_*_LINKER_FLAGS_INIT directly
aec3c79a Strip CMAKE_*_LINKER_FLAGS[_<CONFIG>] initializer whitespace

58677c32 FindPostgreSQL: Fix initialization of PostgreSQL_LIBRARIES

4db08807 CMake: Report whether generators support platforms
43a68a6d cmGlobalGeneratorFactory: Use CM_OVERRIDE for all derived classes
af0e1cd4 Make CMake version dirty state available to code
6a077b5d Make CMake version suffix available to code

Document these variables.

Change our convention for setting these variables from:

    set(CMAKE_EXE_LINKER_FLAGS_INIT "...")

to

    string(APPEND CMAKE_EXE_LINKER_FLAGS_INIT " ...")

so that any value previously set by a toolchain file will be used.

Set `CMake_VERSION_IS_DIRTY` to 1 or 0 depending on whether the CMake
source tree is considered dirty or not.

Make the string (e.g. "rc1" or "gSHA-dirty") available to the code.

9587011d Utilities/Release: Update Windows binary host path to CMake

73e9f36e FindOpenMP: Detect version (specification date) from compiler
8f1103c0 FindOpenMP: Cleanup all variables unconditionally
ec963f04 FindOpenMP: Improve documentation formatting

9b588b2b ExternalData: Hide security-sensitive details from output

2aadb02f QtIFW: Don't show component selection page if it don't need
53992808 QtIFW: process USE_LGPL when CMake_INSTALL_COMPONENTS
8ae035a5 CMake: install COMPONENT cmcldeps

2eec433f ExternalProject: Add support for multiple alternative URLs

36fc3a53 VS: Fix VS 2015 .vcxproj debug setting for v90 toolset (#15986)

35322226 CMakeParseImplicitLinkInfo: Exclude libclang_rt libraries

Avoid copying CMAKE_EXE_LINKER_FLAGS_INIT to the others.

Avoid copying CMAKE_EXE_LINKER_FLAGS_INIT to the others.

Port changes from VTK commit fda6a31cb9 (Added Improved FindOpenMP
module, 2015-04-23).  Improve use of try_compile to avoid needing
to pass OpenMP flags as libraries.

Do not disclose credentials when printing URIs used to fetch external resources.

Also drop link to OpenMP compilers because our supported list may
not include all compilers.

Added in Tools group with IFW installer

0e9e6aa8 Tests: Run clang-format on FindICU test code

Now it is possible to pass multiple URLs as a list that will be tried in
and foreach(). So it will try next URL if the previous failed.

Fixes #15749.

e3bff7b3 Help: Add notes for topic 'findicu'
4a63be15 FindICU: New module

d5e4516e FindHDF5: Cleanup inconsistent use of HDF5_ROOT
4ece8bdd FindHDF5: Properly fail when required components are not found.
87c1cd9c FindHDF5: Fix h5cc arg parsing to work with homebrew on Mac

c376c5bc Do not place CMake version in export files

047862d3 cmake: Fix -E env_vs8_wince implementation
b7a94fbb cmake: Drop unused -E cmake_call_visual_studio_macro code