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Building with ac_add_options --disable-unified-build on macOS hits the following warnings-as-errors: gfx/2d/FilterNodeSoftware.cpp:1022:10 [-Wunreachable-code-return] 'return' will never be executed gfx/2d/DrawTargetCairo.cpp:1957:20 [-Wunused-function] unused function 'GfxMatrixToPixmanTransform' gfx/thebes/gfxHarfBuzzShaper.cpp:1008:23: warning: unused variable 'sDageshForms' [-Wunused-const-variable] gfx/thebes/gfxMacPlatformFontList.mm:818:31 [-Wunused-const-variable] unused variable 'kLangFontsDirs' gfx/tests/gtest/TestSwizzle.cpp:221:21 [-Wunreachable-code] code will never be executed gfx/tests/gtest/TestTreeTraversal.cpp:16:11 [-Wunused-const-variable] unused variable 'PERFORMANCE_TREE_DEPTH' gfx/tests/gtest/TestTreeTraversal.cpp:17:11 [-Wunused-const-variable] unused variable 'PERFORMANCE_TREE_CHILD_COUNT' gfx/tests/gtest/TestTreeTraversal.cpp:18:11 [-Wunused-const-variable] unused variable 'PERFORMANCE_TREE_LEAF_COUNT' gfx/tests/gtest/TestTreeTraversal.cpp:19:11 [-Wunused-const-variable] unused variable 'PERFORMANCE_REGION_XWRAP' gfx/vr/VRDisplayPresentation.cpp:151:3 [-Wunreachable-code-loop-increment] loop will run at most once (loop increment never executed) gfx/ycbcr/scale_yuv_argb.cpp:61:21 [-Wunused-function] unused function 'Abs' Differential Revision: https://phabricator.services.mozilla.com/D126592
This color conversion code is from the Chromium open source project available here: http://code.google.com/chromium/ The code comes from svn revision 63840 on 2010-10-26. It has been superseded upstream by libyuv (which is spawned off it). Bug 791941 is about trying to replace this code with libyuv.