tests: Test Non-API headers

Ensures the non-API headers compile correctly

tests/CMakeLists.txt

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+# ~~~
+# Copyright (c) 2022 LunarG, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ~~~
+
+# Test the non-API headers provided by this repo
+# NOTE: For us testing just means that these header files compile
+# with reasonable warnings.
+
+set(CMAKE_C_STANDARD 99)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_C_EXTENSIONS OFF)
+
+if(${CMAKE_C_COMPILER_ID} MATCHES "(GNU|Clang)")
+    add_compile_options(
+        -Wpedantic
+        -Wall
+        -Wextra
+        -Werror
+    )
+endif()
+
+# vk_icd.h
+add_executable(vk_icd vk_icd.c)
+target_link_libraries(vk_icd PRIVATE Vulkan::Headers)
+
+# vk_layer.h
+add_library(vk_layer MODULE vk_layer.c)
+target_link_libraries(vk_layer PRIVATE Vulkan::Headers)
+
+# vk_sdk_platform.h
+add_executable(vk_sdk_platform vk_sdk_platform.c)
+target_link_libraries(vk_sdk_platform PRIVATE Vulkan::Headers)

tests/vk_icd.c

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+#include "vulkan/vk_icd.h"
+
+int main()
+{
+    return 0;
+}

tests/vk_layer.c

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+#include "vulkan/vk_layer.h"
+
+// Use helper macro intended for vulkan layers to export functions
+VK_LAYER_EXPORT int foobar()
+{
+    return 0;
+}

tests/vk_sdk_platform.c

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+#include "vulkan/vk_sdk_platform.h"
+
+int main()
+{
+    return 0;
+}