Additional things.

1. Googletests subdir was added.  This requires GTest to be installed.  If it is not installed, it's skipped
2. Moved some local variables to the main file to prevent duplicate library_finds and problems that can occur with local calculations.

googletest/meson.build

@@ -0,0 +1,13 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+gtest = cpp.find_library('gtest', required: false)
+gtest_main = cpp.find_library('gtest_main', required: false)
+
+if gtest.found() and gtest_main.found()
+  feature_support_test = executable('Feature-Support-Test', 'feature_support_test.cpp',
+    dependencies : [gtest, gtest_main, dep_dxheaders, d3d12_lib, dxcore_lib],
+    cpp_args : test_compile_opts,
+    c_args : test_compile_opts)
+  test('Feature-Support-Test', feature_support_test)
+endif

meson.build

@@ -4,6 +4,23 @@
 project('DirectX-Headers', 'cpp', version : '1.610.0',
         default_options : ['cpp_std=c++14'])
 
+cpp = meson.get_compiler('cpp')
+compiler_id = cpp.get_id()
+d3d12_lib = cpp.find_library('d3d12')
+#dxcore is not available in Mingw-w64
+if compiler_id == 'msvc'
+    dxcore_lib = cpp.find_library('dxcore')
+else
+    dxcore_lib = cpp.find_library('dxcore', required: false)
+endif
+test_compile_opts = []
+if host_machine.system() == 'windows'
+    test_compile_opts = ['-DUNICODE', '-D_WIN32_WINNT=0x0A00']
+endif
+if (compiler_id == 'gcc') or (compiler_id == 'clang')
+    test_compile_opts += ['-Wno-unused-variable']
+endif
+
 inc_dirs = [include_directories('include', is_system : true)]
 install_inc_subdirs = ['']
 compile_options = []
@@ -36,6 +53,7 @@ if meson.version().version_compare('>=0.54.0')
 endif
 
 if not meson.is_subproject() and get_option('build-test')
+    subdir('googletest')
     subdir('test')
 endif
 

test/meson.build

@@ -1,36 +1,15 @@
 # Copyright (c) Microsoft Corporation.
 # Licensed under the MIT License.
 
-cpp = meson.get_compiler('cpp')
-d3d12_lib = cpp.find_library('d3d12')
-
-compiler_id = cpp.get_id()
-
-#dxcore is not available in Mingw-w64
-if compiler_id == 'msvc'
-  dxcore_lib = cpp.find_library('dxcore')
-else
-  dxcore_lib = cpp.find_library('dxcore', required: false)
-endif
-
-t_compile_opts = []
-if host_machine.system() == 'windows'
-  t_compile_opts = ['-DUNICODE', '-D_WIN32_WINNT=0x0A00']
-endif
-
-if (compiler_id == 'gcc') or (compiler_id == 'clang')
-  t_compile_opts += ['-Wno-unused-variable']
-endif
-
 headers_test = executable('DirectX-Headers-Test', 'test.cpp',
     dependencies : [dep_dxheaders, d3d12_lib, dxcore_lib],
-    cpp_args : t_compile_opts,
+    cpp_args : test_compile_opts,
-    c_args : t_compile_opts)
+    c_args : test_compile_opts)
 test('DirectX-Headers-Test', headers_test)
 
 headers_features_test = executable('DirectX-Headers-Check-Feature-Support-Test', 'feature_check_test.cpp',
     dependencies : [dep_dxheaders, d3d12_lib, dxcore_lib],
-    cpp_args : t_compile_opts,
+    cpp_args : test_compile_opts,
-    c_args : t_compile_opts)
+    c_args : test_compile_opts)
 test('DirectX-Headers-Check-Feature-Support-Test', headers_features_test)