build: Fix enabling of build warnings, and handle most warnings discovered.

Author: rpavlik

src/CMakeLists.txt

@@ -320,12 +320,17 @@ set_target_properties(xr_global_generated_files PROPERTIES FOLDER ${CODEGEN_FOLD
 set(COMMON_GENERATED_OUTPUT ${GENERATED_OUTPUT})
 if(NOT MSVC)
     include(CheckCXXCompilerFlag)
-    foreach(FLAG -Wall -Werror=unused-parameter -Werror=unused-argument)
+    include(CheckCCompilerFlag)
+    foreach(FLAG -Wall -Werror=unused-parameter -Werror=unused-argument -Wpointer-arith)
         string(REGEX REPLACE "[^A-Za-z0-9]" "" _flagvar "${FLAG}")
         check_cxx_compiler_flag(${FLAG} SUPPORTS_${_flagvar})
-        if(SUPPORTS_WARNING_${_flagvar})
+        if(SUPPORTS_${_flagvar})
             set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${FLAG}")
         endif()
+        check_c_compiler_flag(${FLAG} SUPPORTS_C_${_flagvar})
+        if(SUPPORTS_C_${_flagvar})
+            set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${FLAG}")
+        endif()
     endforeach()
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined")
 endif()

src/api_layers/CMakeLists.txt

@@ -186,20 +186,16 @@ if(WIN32)
 	set_target_properties(copy-core_validation-def-file PROPERTIES FOLDER ${HELPER_FOLDER})
 elseif(APPLE)
     # Apple api_dump-specific information
-    target_compile_options(XrApiLayer_api_dump PRIVATE -Wpointer-arith -Wno-unused-function -Wno-sign-compare)
     set_target_properties(XrApiLayer_api_dump PROPERTIES LINK_FLAGS "-Wl")
 
     # Apple core_validation-specific information
-    target_compile_options(XrApiLayer_core_validation PRIVATE -Wpointer-arith -Wno-unused-function -Wno-sign-compare)
     set_target_properties(XrApiLayer_core_validation PROPERTIES LINK_FLAGS "-Wl")
 
 else()
     # Linux api_dump-specific information
-    target_compile_options(XrApiLayer_api_dump PRIVATE -Wpointer-arith -Wno-unused-function -Wno-sign-compare)
     set_target_properties(XrApiLayer_api_dump PROPERTIES LINK_FLAGS "-Wl,-Bsymbolic,--exclude-libs,ALL")
 
     # Linux core_validation-specific information
-    target_compile_options(XrApiLayer_core_validation PRIVATE -Wpointer-arith -Wno-unused-function -Wno-sign-compare)
     set_target_properties(XrApiLayer_core_validation PROPERTIES LINK_FLAGS "-Wl,-Bsymbolic,--exclude-libs,ALL")
 endif()
 

src/common/gfxwrapper_opengl.c

@@ -3190,6 +3190,10 @@ ksGpuWindowEvent ksGpuWindow_ProcessEvents(ksGpuWindow *window) {
 
 #elif defined(OS_LINUX_WAYLAND)
 
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
 static void _keyboard_keymap_cb(void *data, struct wl_keyboard *keyboard, uint32_t format, int fd, uint32_t size) { close(fd); }
 static void _keyboard_modifiers_cb(void *data, struct wl_keyboard *keyboard, uint32_t serial, uint32_t mods_depressed,
                                    uint32_t mods_latched, uint32_t mods_locked, uint32_t group) {}
@@ -3337,11 +3341,16 @@ static void _registry_cb(void *data, struct wl_registry *registry, uint32_t id,
 
 static void _registry_remove_cb(void *data, struct wl_registry *registry, uint32_t id) {}
 
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif
+
 const struct wl_registry_listener registry_listener = {_registry_cb, _registry_remove_cb};
 
 bool ksGpuWindow_Create(ksGpuWindow *window, ksDriverInstance *instance, const ksGpuQueueInfo *queueInfo, const int queueIndex,
                         const ksGpuSurfaceColorFormat colorFormat, const ksGpuSurfaceDepthFormat depthFormat,
                         const ksGpuSampleCount sampleCount, const int width, const int height, const bool fullscreen) {
+    (void)queueIndex;
     memset(window, 0, sizeof(ksGpuWindow));
 
     window->display = NULL;

src/loader/CMakeLists.txt

@@ -213,11 +213,7 @@ endif()
 if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
     target_compile_options(
         openxr_loader
-        PRIVATE -Wall
-                -Wextra
-                -Wno-unused-parameter
-                -Wno-missing-field-initializers
-                -Wpointer-arith
+        PRIVATE -Wextra
                 -fno-strict-aliasing
                 -fno-builtin-memcmp
                 "$<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>"

src/scripts/validation_layer_generator.py

@@ -589,6 +589,11 @@ def outputValidationHeaderInfo(self):
         validation_header_info += '\n// Current API version of the Core Validation API Layer\n#define XR_CORE_VALIDATION_API_VERSION '
         validation_header_info += self.api_version_define
         validation_header_info += '\n'
+        validation_header_info += '#if defined(__GNUC__)\n'
+        validation_header_info += '#pragma GCC diagnostic push\n'
+        validation_header_info += '#pragma GCC diagnostic ignored "-Wunused-parameter"\n'
+        validation_header_info += '#pragma GCC diagnostic ignored "-Wunused-variable"\n'
+        validation_header_info += '#endif\n'
 
         validation_header_info += '\n// Externs for Core Validation\n'
         validation_header_info += self.outputInfoMapDeclarations(extern=True)
@@ -1001,8 +1006,6 @@ def writeValidateStructNextCheck(self, struct_type, struct_name, member, indent)
         validate_struct_next += self.writeIndent(indent)
         validate_struct_next += '} else if (NEXT_CHAIN_RESULT_DUPLICATE_STRUCT == next_result) {\n'
         validate_struct_next += self.writeIndent(indent + 1)
-        validate_struct_next += 'char struct_type_buffer[XR_MAX_STRUCTURE_NAME_SIZE];\n'
-        validate_struct_next += self.writeIndent(indent + 1)
         validate_struct_next += 'std::string error_message = "Multiple structures of the same type(s) in \\"next\\" chain for ";\n'
         validate_struct_next += self.writeIndent(indent + 1)
         validate_struct_next += 'error_message += "%s : ";\n' % struct_type

src/tests/hello_xr/CMakeLists.txt

@@ -81,8 +81,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     if(NOT D3D_DIRECTXCOLORS_INCLUDE_DIR)
         target_compile_definitions(hello_xr PRIVATE -DMISSING_DIRECTX_COLORS)
     endif()
-elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    target_compile_options(hello_xr PRIVATE -Wall)
 endif()
 
 if(Vulkan_LIBRARY)

src/tests/list/CMakeLists.txt

@@ -40,10 +40,6 @@ if(MSVC)
     target_compile_options(runtime_list PRIVATE /Zc:wchar_t /Zc:forScope /W4 /WX)
 endif()
 
-if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    target_compile_options(runtime_list PRIVATE -Wall)
-endif()
-
 set_target_properties(runtime_list PROPERTIES FOLDER ${TESTS_FOLDER})
 set_target_properties(runtime_list PROPERTIES OUTPUT_NAME openxr_runtime_list)
 

src/tests/loader_test/CMakeLists.txt

@@ -53,9 +53,7 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     endif()
 
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    target_compile_options(
-        loader_test PRIVATE -Wall -Wno-unused-function -Wno-format-truncation
-    )
+    # No special options needed.
 else()
     message(FATAL_ERROR "Unsupported Platform")
 endif()

src/tests/loader_test/test_layers/CMakeLists.txt

@@ -69,7 +69,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
     )
 	set_target_properties(copy-test-def-file PROPERTIES FOLDER ${HELPER_FOLDER})
 elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    target_compile_options(XrApiLayer_test PRIVATE -Wpointer-arith -Wno-unused-function -Wno-sign-compare)
     set_target_properties(XrApiLayer_test PROPERTIES LINK_FLAGS "-Wl,-Bsymbolic,--exclude-libs,ALL")
     gen_xr_layer_json(
         ${PROJECT_BINARY_DIR}/src/tests/loader_test/resources/layers/XrApiLayer_test.json

src/tests/loader_test/test_layers/layer_test.cpp

@@ -39,7 +39,7 @@
 extern "C" {
 std::map<XrInstance, PFN_xrGetInstanceProcAddr> g_next_gipa_map;
 
-XRAPI_ATTR XrResult XRAPI_CALL LayerTestXrCreateInstance(const XrInstanceCreateInfo *info, XrInstance *instance) {
+XRAPI_ATTR XrResult XRAPI_CALL LayerTestXrCreateInstance(const XrInstanceCreateInfo * /* info */, XrInstance * /* instance */) {
     // In a layer, LayerTestXrCreateApiLayerInstance is called instead of this function. This should not be called.
     return XR_ERROR_FUNCTION_UNSUPPORTED;
 }
@@ -118,6 +118,7 @@ LAYER_EXPORT XrResult xrNegotiateLoaderApiLayerInterface(const XrNegotiateLoader
         return XR_ERROR_INITIALIZATION_FAILED;
     }
 
+    (void)layerName;
     layerRequest->layerInterfaceVersion = XR_CURRENT_LOADER_API_LAYER_VERSION;
     layerRequest->layerApiVersion = XR_MAKE_VERSION(0, 1, 0);
     layerRequest->getInstanceProcAddr = LayerTestXrGetInstanceProcAddr;
@@ -127,9 +128,9 @@ LAYER_EXPORT XrResult xrNegotiateLoaderApiLayerInterface(const XrNegotiateLoader
 }
 
 // Always fail
-LAYER_EXPORT XrResult TestlayerAlwaysFailNegotiateLoaderApiLayerInterface(const XrNegotiateLoaderInfo *loaderInfo,
-                                                                          const char *layerName,
-                                                                          XrNegotiateApiLayerRequest *layerRequest) {
+LAYER_EXPORT XrResult TestlayerAlwaysFailNegotiateLoaderApiLayerInterface(const XrNegotiateLoaderInfo * /* loaderInfo */,
+                                                                          const char * /* layerName */,
+                                                                          XrNegotiateApiLayerRequest * /* layerRequest */) {
     return XR_ERROR_INITIALIZATION_FAILED;
 }
 
@@ -148,7 +149,7 @@ LAYER_EXPORT XrResult TestLayerNullGipaNegotiateLoaderApiLayerInterface(const Xr
         loaderInfo->minApiVersion < XR_MAKE_VERSION(0, 1, 0) || loaderInfo->minApiVersion >= XR_MAKE_VERSION(1, 1, 0)) {
         return XR_ERROR_INITIALIZATION_FAILED;
     }
-
+    (void)layerName;
     layerRequest->layerInterfaceVersion = XR_CURRENT_LOADER_API_LAYER_VERSION;
     layerRequest->layerApiVersion = XR_MAKE_VERSION(0, 1, 0);
     layerRequest->getInstanceProcAddr = nullptr;
@@ -171,7 +172,7 @@ LAYER_EXPORT XrResult TestLayerInvalidInterfaceNegotiateLoaderApiLayerInterface(
         loaderInfo->minApiVersion < XR_MAKE_VERSION(0, 1, 0) || loaderInfo->minApiVersion >= XR_MAKE_VERSION(1, 1, 0)) {
         return XR_ERROR_INITIALIZATION_FAILED;
     }
-
+    (void)layerName;
     layerRequest->layerInterfaceVersion = 0;
     layerRequest->layerApiVersion = XR_MAKE_VERSION(0, 1, 0);
     layerRequest->getInstanceProcAddr = reinterpret_cast<PFN_xrGetInstanceProcAddr>(LayerTestXrGetInstanceProcAddr);
@@ -194,7 +195,7 @@ LAYER_EXPORT XrResult TestLayerInvalidApiNegotiateLoaderApiLayerInterface(const
         loaderInfo->minApiVersion < XR_MAKE_VERSION(0, 1, 0) || loaderInfo->minApiVersion >= XR_MAKE_VERSION(1, 1, 0)) {
         return XR_ERROR_INITIALIZATION_FAILED;
     }
-
+    (void)layerName;
     layerRequest->layerInterfaceVersion = XR_CURRENT_LOADER_API_LAYER_VERSION;
     layerRequest->layerApiVersion = 0;
     layerRequest->getInstanceProcAddr = reinterpret_cast<PFN_xrGetInstanceProcAddr>(LayerTestXrGetInstanceProcAddr);