238443 2022-03-28 03:45:14 -0700 [GLIB] Build error in GraphicsContextState.cpp (error: no match for 'operator!=') in Ubuntu LTS after r291696 2022-03-28 12:23:04 -0700 1 1 1 Unclassified WebKit New Bugs WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 dpino dpino aperez lmoura webkit-bug-importer oldest_to_newest 1855528 0 dpino 2022-03-28 03:45:14 -0700 [GLIB] Build error in GraphicsContextState.cpp (error: no match for 'operator!=') in Ubuntu LTS after r291696 1855529 1 455896 dpino 2022-03-28 03:47:27 -0700 Created attachment 455896 Patch 1855531 2 455896 aperez 2022-03-28 04:05:13 -0700 Comment on attachment 455896 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=455896&action=review > Source/WebCore/platform/graphics/GraphicsTypes.h:90 > +} This cannot work, moving the function outside of the “class” block means that now there is no implicit “this”, and that no operator== is defined at all for CompositeMode. You need to leave this one as it was. 1855550 3 455903 dpino 2022-03-28 05:19:25 -0700 Created attachment 455903 Patch 1855565 4 dpino 2022-03-28 06:11:53 -0700 The build error from the Ubuntu LTS build bot was: ``` Source/WebCore/platform/graphics/GraphicsContextState.cpp:60:84: error: no match for ‘operator!=’ (operand types are ‘const WebCore::CompositeMode’ and ‘WebCore::CompositeMode’) 60 | changeFlags.set(change, !lastDrawingState || (*lastDrawingState).*property != this->*property); ``` https://build.webkit.org/#/builders/68/builds/12304/steps/8/logs/stdio 1855655 5 ews-feeder 2022-03-28 10:05:21 -0700 Committed r291970 (248935@main): <https://commits.webkit.org/248935@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 455903. 1855656 6 webkit-bug-importer 2022-03-28 10:06:16 -0700 <rdar://problem/90929679> 1855725 7 lmoura 2022-03-28 12:23:04 -0700 FTR, this seems to be related to changes to the C++20 equality/spaceship operators in GCC 10 Sample godbolt: https://godbolt.org/z/GWen331rM GCC C++20 support: https://gcc.gnu.org/projects/cxx-status.html#cxx20 Especially the following spec, first supported in gcc10: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1185r2.html#wording > A defaulted != operator function for a class C with parameters x and y is defined as deleted if > (snip list of cases where != would be deleted.) > Otherwise, the operator function yields (x == y) ? false : true if an operator == with the original order of parameters was selected, or (y == x) ? false : true otherwise. So, GCC >10 correctly defined the defaulted `!=` operator, while older GCC's needed them to be explicitly defined (like the patch did), as it did not implement this behavior. 455896 2022-03-28 03:47:27 -0700 2022-03-28 05:45:59 -0700 Patch bug-238443-20220328184726.patch text/plain 3744 dpino U3VidmVyc2lvbiBSZXZpc2lvbjogMjkxOTYxCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNjJhMTkzMDQ3YmZiYmZj ZDRjNjA5ZGQ2NGI4NTkwMTg1YjU3YTc3Zi4uNzM0ODUzNDYyMzUwYjRjOTY4MDdjNGVkZTU1ZGQ1 ODRjMjlkMGFiYyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDIwIEBACisyMDIyLTAzLTI4ICBEaWVn byBQaW5vIEdhcmNpYSAgPGRwaW5vQGlnYWxpYS5jb20+CisKKyAgICAgICAgW0dMSUJdIEZpeCBi dWlsZCBlcnJvciAnbm90IG1hdGNoIG9wZXJhdG9yICE9JyBpbiBVYnVudHUgTFRTIGFmdGVyIHIy OTE2OTYKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIz ODQ0MworCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIFRo 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