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C++11 code cleanup.

PiperOrigin-RevId: 217364243

PiperOrigin-RevId: 216423319

PiperOrigin-RevId: 216417182

Using absolute paths in the pkg-config file makes it not relocatable and
leads to problems, when trying to use it with precompiled cross
toolchains. Setting prefix to relative path based on pcfiledir makes it
more reliable for such cases.

PiperOrigin-RevId: 216411381

Remove all mention of TR1 tuple and our own implementation of tuple.

PiperOrigin-RevId: 216395043

PiperOrigin-RevId: 216389313

We are not maintaining change log, it has not been touched for a long time

PiperOrigin-RevId: 216193701

PiperOrigin-RevId: 216183352

Now that googletest has moved to C++11, it should no longer
use NULL or 0 for the null pointer. This patch converts all
such usages to nullptr using clang-tidy.

This prevents LLVM from issuing -Wzero-as-null-pointer-constant
warnings.

PiperOrigin-RevId: 215814400

Closes #1836

PiperOrigin-RevId: 215461025

Closes #1867

PiperOrigin-RevId: 215392714

Remove non-variadic pre C++11 ElementsAreMatcher and UnorderedElementsAreMatcher

PiperOrigin-RevId: 214266944

Treat default-constructed string_view same as constructed from "".
In the context of string comparison (e.g. HasSubstr, StartsWith, EndsWith,
etc.), a default-constructed string_view (nullptr) should be semantically same
as a empty string "".

PiperOrigin-RevId: 212816839

Project import generated by Copybara.

PiperOrigin-RevId: 212656749

Internal Change

PiperOrigin-RevId: 212656679

Project import sync

PiperOrigin-RevId: 212450488

Internal Change

PiperOrigin-RevId: 211798074

* GTest is a required dependency for GMock, hence
  we always need to pull it in.

Fix broken OSS windows build.

PiperOrigin-RevId: 210969049

Internal Change

PiperOrigin-RevId: 210594341

Fix line that was wrapping in the middle of a link

This looks uglier, but has the advantage that the link is kept in one
piece.

PiperOrigin-RevId: 210537337

This makes ResultOf more convenient to use. In particular, the matcher now accepts
lambdas.

PiperOrigin-RevId: 210118509

To make sure packages are relocatable, use `$<INSTALL_PREFIX>` in
`$<INSTALL_INTERFACE:...>` `target_include_directories`.

`$<INSTALL_PREFIX>` was introduced in CMake 2.8.11, which is already
being checked for locally.

References:

- https://cmake.org/cmake/help/latest/manual/cmake-packages.7.html#id19
- https://github.com/robotology/how-to-export-cpp-library/blob/claudio/headeronly/src/LibTemplateCMake/CMakeLists.txt#L42

Signed-off-by: Dakota Hawkins <dakotahawkins@gmail.com>

This step is no longer necessary. The configuration given in the
googletest README.md is sufficient to bring in all the googlemock
headers.

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>