build(yaml-cpp): added yaml-cpp as a dependency

config files will be written in yaml, added a well tested yaml parser to 4DSSE

build-config/meson.build

@@ -1 +1,4 @@
-subdir('mfem')
+cmake = import('cmake')
+
+subdir('mfem')
+subdir('yaml-cpp')

build-config/mfem/meson.build

@@ -1,4 +1,3 @@
-cmake = import('cmake')
 patchFile = files('disable_mfem_selfcheck.patch')
 
 patch_check = run_command('grep', '-q', 'MFEM_CHECK_TARGET_NAME', 'subprojects/mfem/CMakeLists.txt', check: false)

build-config/yaml-cpp/meson.build

@@ -0,0 +1,5 @@
+yaml_cpp_sp = cmake.subproject(
+    'yaml-cpp'
+)
+yaml_cpp_dep = yaml_cpp_sp.dependency('yaml-cpp')
+add_project_arguments('-I' + meson.current_build_dir() + '/subprojects/yaml-cpp/__CMake_build', language: 'cpp')