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There is no need to use the embedded gtest code copy in Linux systems, if they already provide the googletest framework system-wide.
Search for it, and fallback to the embedded one if the system one is not detected.

This patch has been also contributed by Simon Quigley <tsimonq2@debian.org>

* CMake: Add option to set the package install dir.

* CMake: Fix generated config.

- `YAML_CPP_SHARED_LIBS_BUILT` should not be set with a `PATH_VAR` as it
would always evaluate to true.
- `YAML_CPP_LIBRARIES` should used the exported target name including
the namespace, but `check_required_components` shouldn't.
- Use `CMAKE_CURRENT_LIST_DIR` to find the target file, instead of a
`PATH_VAR`. Package managers such as vcpkg move CMake configs after
installing.

* CI: Test the generated CMake package.

* CMake: Create add a deprecated yaml-cpp target.

This target is meant to provide compatibility with versions prior to
0.8.0.

* CMake: mark the yaml-cpp target as IMPORTED.

---------
Co-authored-by: Jesse Beder <jbeder+github@gmail.com>

cd /<<PKGBUILDDIR>>/build-static/test && /usr/bin/c++ -DYAML_CPP_STATIC_DEFINE -I/<<PKGBUILDDIR>>/test/integration -I/<<PKGBUILDDIR>>/test -I/<<PKGBUILDDIR>>/src -I/<<PKGBUILDDIR>>/include -isystem /usr/src/googletest/googlemock/include -isystem /usr/src/googletest/googlemock -isystem /usr/src/googletest/googletest/include -isystem /usr/src/googletest/googletest -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fdebug-prefix-map=/<<PKGBUILDDIR>>=/usr/src/yaml-cpp-0.8.0+dfsg-1~build1 -Wdate-time -D_FORTIFY_SOURCE=2 -std=gnu++14 -Wno-variadic-macros -Wno-sign-compare -DGTEST_HAS_PTHREAD=1 -MD -MT test/CMakeFiles/yaml-cpp-tests.dir/binary_test.cpp.o -MF CMakeFiles/yaml-cpp-tests.dir/binary_test.cpp.o.d -o CMakeFiles/yaml-cpp-tests.dir/binary_test.cpp.o -c /<<PKGBUILDDIR>>/test/binary_test.cpp
/<<PKGBUILDDIR>>/test/binary_test.cpp: In member function ‘virtual void BinaryTest_DecodingNoCrashOnNegative_Test::TestBody()’:
/<<PKGBUILDDIR>>/test/binary_test.cpp:11:38: error: narrowing conversion of ‘-58’ from ‘int’ to ‘char’ [-Wnarrowing]
   11 |   std::string input{-58, -1, -99, 109};
      |                                      ^

* Test(CMake) set NAME and COMMAND in add_test

* (CMake) add enable_testing()

* (CMake) move cmake_dependent_option up, before using them

* (CMake) use YAML_CPP_MAIN_PROJECT in cmake_dependent_option

* (CMake) log values regarding tests

* (CMake) always find CTest, but don't enable tests

* (CMAKE)(temp) fix logging

* (actions) set YAML_CPP_BUILD_TESTS for tests

* (actions) provide YAML_CPP_BUILD_TESTS to ctest

* (actions) set -DYAML_CPP_BUILD_TESTS at build

* (actions) don't fail false

* (actions) build tests in Test step

* (actions) run tests verbose

* (CMake) remove temp logging

* (actions) split building from running tests

* (actions) ctest Debug

* (actions) ctest Debug

* Remove enable_testing

Complies with YAML Standard [5.4](https://yaml.org/spec/1.2.2/#54-line-break-characters) [25] instead of matching `\r` only in combination with `\n`.

Properly resolves #1083, #996.

Add copying of shared library to the output directory with a test binary.

[binary] removed using of non unsigned char as argument at
'std::isspace' function that was provokes undefined behavior.

[.github/workflows/build.yml] enabled run of test at the
'windows-latest' environment.

* fix issue743: handle the empty content of flow sep/map correctly during emitting.

* handle the empty Tag/Anchor properly.

* delete comment

Fixes #917

Fixes #501

Fixes #590.

For completeness I've implemented escaping for characters outside the
basic multilingual plane, but it doesn't get used (as there's no
EscapeAsAsciiJson emitter option implemented).

Fixes #740.

Inside of a sequence or map, `YAML::Newline` wouldn't reset the collection state, which would cause behavior like this:

```
nodeA:   
    k: [{i: 0},
 {i:1},
  ]NodeB:
    k: [{i: 0},
 {i:1},
  ]
```

* Support kinds of emitter format-setting for YAML::Null.

* update the code and test cases

* add the comment //fallthrough

* fix issue752: generate right long keys

* Improve the readability of test cases

* update to raw string literal

* partially fix clang compilation

Missing header and mistaken algorithm usage.

Also removed it name from range loops. It's not correct.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* run through clang's -Wrange-loop-analysis

Some range loops should not use references as they need to copy.
Signed-off-by: Rosen Penev <rosenp@gmail.com>

* manual range loop conversions
Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fix issue 844/848.

Fixing issue 859.

Add test cases for the event handler for schema tags; does not include test cases for Node because specialized tag handling is not implemented yet.