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Rework of the closed pull request #768

I _think_ this represents some of the "best practices" for exporting
targets. They'll be available in a `googletest::` namespace (e.g.
`googletest::gmock`) with non-namespaced `ALIAS` targets.

- Added GOOGLETEST_VERSION variable
- Use `CMakePackageConfigHelpers`, bump minimum CMake version to 2.8.8
Signed-off-by: Dakota Hawkins <dakotahawkins@gmail.com>

Fix a bug deciding whether to enable the option to install Google Test
caused by one of the dependent option dependencies not being defined
yet.

Fixes #1198; impossible to install Google Test if Google Mock is built.

Modify library install destinations to install .dll's to the correct
location (`bin`, not `lib`), and to install other artifacts to the
correct platform-dependent location by using GNUInstallDirs. This is
required for some distributions (e.g. Fedora) and will fix an issue that
otherwise requires those distributions to patch the upstream sources.
Also, add options to suppress installation, which may be useful for
projects that embed Google Test.

Since Google Test is trying to support archaic versions of CMake, a
brain-dead fallback (which requires that the user set either LIB_SUFFIX
or CMAKE_INSTALL_LIBDIR themselves) is included for versions that
predate GNUInstallDirs.

Fixes #1161.
Co-Authored-By: d3x0r <d3x0r@users.noreply.github.com>

#1169

Adding functionality to build googletest from the root directory

Also improve an error message in gtest_test_utils.py.

Removes testing::internal::String::Format(), which causes problems as it truncates the result at 4096 chars. Also update an obsolete link in comment.

Adds a gtest_disable_pthreads CMake option; also fixes an include order problem in the cmake script.

Makes gtest print enums as integers instead of hex dumps (by Zhanyong Wan); improves the hex dump format (by Zhanyong Wan); gets rid of class TestInfoImpl (by Zhanyong Wan); adds exception handling (by Vlad Losev).

Moves the universal printer from gmock to gtest and refactors the cmake script for reusing in gmock (by Vlad Losev).

Fixes compatibility with Visual Age versions lower than 9.0 (by Hady Zalek); updates the release notes.

Fixes a -Wextra warning in gtest-param-util.h and updates the cmake script to verify it (by Zhanyong Wan); adds support for hermetic build to the cmake script (by Vlad Losev).