Fix compilation with stdlibc++ (instead of libc++)

Also fixes some warnings when compiling with GCC

Bug: dawn:333
Change-Id: Ib597bb3b950476279a1e20e3556765ec9f1db697
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/15960
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>

generator/templates/dawn_wire/client/ApiProcs.cpp

@@ -17,6 +17,7 @@
 #include "dawn_wire/client/Client.h"
 
 #include <algorithm>
+#include <cstring>
 #include <string>
 #include <vector>
 

src/dawn_native/Buffer.cpp

@@ -192,6 +192,8 @@ namespace dawn_native {
                 return DAWN_VALIDATION_ERROR("Buffer used in a submit while mapped");
             case BufferState::Unmapped:
                 return {};
+            default:
+                UNREACHABLE();
         }
     }
 
@@ -444,6 +446,8 @@ namespace dawn_native {
                 return {};
             case BufferState::Destroyed:
                 return DAWN_VALIDATION_ERROR("Buffer is destroyed");
+            default:
+                UNREACHABLE();
         }
     }
 

src/dawn_native/CommandEncoder.cpp

@@ -30,6 +30,7 @@
 #include "dawn_platform/DawnPlatform.h"
 #include "dawn_platform/tracing/TraceEvent.h"
 
+#include <cmath>
 #include <map>
 
 namespace dawn_native {

src/dawn_native/DawnNative.cpp

@@ -64,10 +64,8 @@ namespace dawn_native {
                 return BackendType::OpenGL;
             case wgpu::BackendType::Vulkan:
                 return BackendType::Vulkan;
-
             default:
                 UNREACHABLE();
-                return BackendType::Null;
         }
     }
 
@@ -81,6 +79,8 @@ namespace dawn_native {
                 return DeviceType::CPU;
             case wgpu::AdapterType::Unknown:
                 return DeviceType::Unknown;
+            default:
+                UNREACHABLE();
         }
     }
 

src/dawn_native/ErrorData.h

@@ -16,6 +16,7 @@
 #define DAWNNATIVE_ERRORDATA_H_
 
 #include <cstdint>
+#include <memory>
 #include <string>
 #include <vector>
 

src/dawn_native/RefCounted.cpp

@@ -16,6 +16,8 @@
 
 #include "common/Assert.h"
 
+#include <cstddef>
+
 namespace dawn_native {
 
     static constexpr size_t kPayloadBits = 1;

src/dawn_native/RenderPipeline.cpp

@@ -20,6 +20,8 @@
 #include "dawn_native/Device.h"
 #include "dawn_native/ValidationUtils_autogen.h"
 
+#include <cmath>
+
 namespace dawn_native {
     // Helper functions
     namespace {

src/dawn_native/vulkan/RenderPipelineVk.cpp

@@ -144,6 +144,8 @@ namespace dawn_native { namespace vulkan {
                     return VK_FRONT_FACE_COUNTER_CLOCKWISE;
                 case wgpu::FrontFace::CW:
                     return VK_FRONT_FACE_CLOCKWISE;
+                default:
+                    UNREACHABLE();
             }
         }
 
@@ -155,6 +157,8 @@ namespace dawn_native { namespace vulkan {
                     return VK_CULL_MODE_FRONT_BIT;
                 case wgpu::CullMode::Back:
                     return VK_CULL_MODE_BACK_BIT;
+                default:
+                    UNREACHABLE();
             }
         }