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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>

Hide uninstall target unless YAML_CPP_INSTALL is set, and allow it to be disabled by YAML_CPP_DISABLE_UNINSTALL 

add_custom_target uninstall causes a clash with the same target in rtmidi (https://github.com/thestk/rtmidi

).
"add_custom_target cannot create target "uninstall" because another target with the same name already exists.  The existing target is a custom target created in source directory"

Adds new option YAML_CPP_DISABLE_UNINSTALL 

fixes #1151

---------
Co-authored-by: Megamouse <studienricky89@googlemail.de>
Co-authored-by: Jesse Beder <jbeder+github@gmail.com>

node/convert: Enable the template specialization for `std::string_view` properly when the library is compiled by MSVC on Windows. (#1227)

* CI: test with supported C++ standards

let's test with the supported standards for better coverage.
C++23 standard was just out, but the support on the toolchain is
not quite ready yet. so let's leave it for a future change.
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

* CI: drop redundant Build step

"Build Tests" is strictly a superset of "Build". in addition to
the library, the former builds the tests also. both these
steps share the same set of command line arguments. by removing
"Build" step, we don't lose anything regarding the test coverage
and information for further investigation if the build fails.
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

---------
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

This reverts commit 62622011.

in 62622011, we wanted address the needs to use the `string_view`
converter in C++98, but that requirement was based on wrong
preconditions. `std::string_view` was introduced in C++17, and
popular standard libraries like libstdc++ and libc++ both provide
`std::string_view` when the source is built with C++17.

furthermore 62622011 is buggy. because it uses `<version>` to tell
the feature set provided by the standard library. but `<version>`
is a part of C++20. so this defeats the purpose of the change of
62622011.

Fixes #1223

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};
      |                                      ^

This matches the name for the ALIAS targets, and fixes #1025.

This reverts commit 74f63c11.

* 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

It secures the repo against erroneous or malicious actions from external jobs you call from your workflow. It's specially important for the case they get compromised, for example.

This pull request adds two new exported variables to the CMake config:

YAML_CPP_LIBRARY_DIR - points to the directory containing the built library files
YAML_CPP_SHARED_LIBS_BUILT - boolean value, lets users know whether shared libraries were built or not

Add definitions to static yaml-cpp target (fixes #1116)

Also updates CONTRIBUTING instructions for tests

Minimize warnings when not the top-level project

Should fix #970 and #764 when trying to add yaml-cpp to other project

On Oracle Solaris the following statement is declared in file /usr/include/sys/regset.h:
#define SS 18 /* only stored on a privilege transition */

Because of this template type name SS is substituted by numeric literal, which results in a compilation error:
error: expected nested-name-specifier before numeric constant

Fixed by renaming template type names.
Co-authored-by: Roman Degtyar <Roman.Degtyar@veeam.com>

Windows builds need some defines being set to use the static linking.

Also add bazel builds and test to Github-CI.