clang's -Wmissing-prototypes option identifies global functions that can be made static (because they're only called from one compilation unit) or removed (if they're never called). Green Try build: https://treeherder.mozilla.org/#/jobs?repo=try&revision=e0659997a04319207842faac852546f363e17b69 gfx/2d/BufferUnrotate.cpp:17:6 [-Wmissing-prototypes] no previous prototype for function 'BufferUnrotate' gfx/2d/DrawTargetCairo.cpp:195:6 [-Wmissing-prototypes] no previous prototype for function 'ReleaseData' gfx/2d/DrawTargetCairo.cpp:201:18 [-Wmissing-prototypes] no previous prototype for function 'CopyToImageSurface' gfx/2d/DrawTargetCairo.cpp:239:18 [-Wmissing-prototypes] no previous prototype for function 'GetAsImageSurface' gfx/2d/DrawTargetCairo.cpp:251:18 [-Wmissing-prototypes] no previous prototype for function 'CreateSubImageForData' gfx/2d/DrawTargetCairo.cpp:272:18 [-Wmissing-prototypes] no previous prototype for function 'ExtractSubImage' gfx/2d/DrawTargetCairo.cpp:308:18 [-Wmissing-prototypes] no previous prototype for function 'GetCairoSurfaceForSourceSurface' gfx/2d/DrawTargetRecording.cpp:26:6 [-Wmissing-prototypes] no previous prototype for function 'RecordingSourceSurfaceUserDataFunc' gfx/2d/DrawTargetRecording.cpp:272:6 [-Wmissing-prototypes] no previous prototype for function 'RecordingFontUserDataDestroyFunc' gfx/2d/DrawTargetWrapAndRecord.cpp:26:6 [-Wmissing-prototypes] no previous prototype for function 'WrapAndRecordSourceSurfaceUserDataFunc' gfx/2d/DrawTargetWrapAndRecord.cpp:358:6 [-Wmissing-prototypes] no previous prototype for function 'WrapAndRecordFontUserDataDestroyFunc' gfx/2d/FilterNodeSoftware.cpp:1816:6 [-Wmissing-prototypes] no previous prototype for function 'IsAllZero' gfx/2d/FilterNodeSoftware.cpp:183:37 [-Wmissing-prototypes] no previous prototype for function 'CloneAligned' gfx/2d/MacIOSurface.cpp:442:6 [-Wmissing-prototypes] no previous prototype for function 'MacIOSurfaceBufferDeallocator' gfx/2d/QuartzSupport.mm:38:6 [-Wmissing-prototypes] no previous prototype for function 'cgdata_release_callback' gfx/2d/ScaledFontMac.cpp:191:10 [-Wmissing-prototypes] no previous prototype for function 'CalcTableChecksum' gfx/2d/ScaledFontMac.cpp:224:5 [-Wmissing-prototypes] no previous prototype for function 'maxPow2LessThan' gfx/2d/unittest/TestCairo.cpp:12:6 [-Wmissing-prototypes] no previous prototype for function 'TryCircle' gfx/gl/GfxTexturesReporter.cpp:22:13 [-Wmissing-prototypes] no previous prototype for function 'FormatBytes' gfx/gl/GLContextFeatures.cpp:534:6 [-Wmissing-prototypes] no previous prototype for function 'IsFeaturePartOfProfileVersion' gfx/layers/client/TiledContentClient.cpp:337:6 [-Wmissing-prototypes] no previous prototype for function 'ShutdownTileCache' gfx/layers/composite/ContainerLayerComposite.cpp:132:6 [-Wmissing-prototypes] no previous prototype for function 'TransformLayerGeometry' gfx/layers/composite/LayerManagerComposite.cpp:1409:6 [-Wmissing-prototypes] no previous prototype for function 'ComputeVisibleRegionForChildren' gfx/layers/composite/LayerManagerComposite.cpp:234:6 [-Wmissing-prototypes] no previous prototype for function 'ShouldProcessLayer' gfx/layers/composite/TiledContentHost.cpp:156:6 [-Wmissing-prototypes] no previous prototype for function 'UseTileTexture' gfx/layers/ipc/CompositorBridgeParent.cpp:1827:6 [-Wmissing-prototypes] no previous prototype for function 'EraseLayerState' gfx/layers/ipc/CompositorBridgeParent.cpp:2140:6 [-Wmissing-prototypes] no previous prototype for function 'UpdateIndirectTree' gfx/layers/opengl/OGLShaderProgram.cpp:28:6 [-Wmissing-prototypes] no previous prototype for function 'AddUniforms' gfx/layers/Layers.cpp:58:7 [-Wmissing-prototypes] no previous prototype for function 'FILEOrDefault' gfx/layers/ipc/CompositorThread.cpp:26:25 [-Wmissing-prototypes] no previous prototype for function 'GetCompositorThreadHolder' gfx/thebes/gfxBlur.cpp:444:6 [-Wmissing-prototypes] no previous prototype for function 'CacheBlur' gfx/thebes/gfxPlatform.cpp:1087:6 [-Wmissing-prototypes] no previous prototype for function 'IsFeatureSupported' gfx/thebes/gfxPlatform.cpp:1355:6 [-Wmissing-prototypes] no previous prototype for function 'SourceBufferDestroy' gfx/thebes/gfxPlatform.cpp:1365:6 [-Wmissing-prototypes] no previous prototype for function 'SourceSurfaceDestroyed' gfx/thebes/gfxPlatform.cpp:2422:6 [-Wmissing-prototypes] no previous prototype for function 'VideoDecodingFailedChangedCallback' gfx/thebes/gfxPlatform.cpp:559:6 [-Wmissing-prototypes] no previous prototype for function 'WebRenderDebugPrefChangeCallback' widget/GfxInfoBase.cpp:82:6 [-Wmissing-prototypes] no previous prototype for function 'InitGfxDriverInfoShutdownObserver' widget/headless/HeadlessWidget.cpp:49:30 [-Wmissing-prototypes] no previous prototype for function 'CreateDefaultTarget'
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clang's -Wmissing-prototypes option identifies global functions that can be made static (because they're only called from one compilation unit) or removed (if they're never called). Green Try build: https://treeherder.mozilla.org/#/jobs?repo=try&revision=e0659997a04319207842faac852546f363e17b69