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[Impeller] Don't define CanvasRecorder if IMPELLER_TRACE_CANVAS is not set.
#46476
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gaaclarke
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Oh wild, I didn't expect to see such a difference in compilers. Nice find. I was trying to keep the ifdef compact but this will work, lgtm.
CanvasRecorder if IMPELLER_TRACE_CANVAS is not setCanvasRecorder if IMPELLER_TRACE_CANVAS is not set.
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…ANVAS` is not set. (flutter/engine#46476)
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flutter/engine@2fda861...857f800 2023-10-04 jiahaog@users.noreply.github.com [Impeller] Don't define `CanvasRecorder` if `IMPELLER_TRACE_CANVAS` is not set. (flutter/engine#46476) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
Mairramer
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) flutter/engine@2fda861...857f800 2023-10-04 jiahaog@users.noreply.github.com [Impeller] Don't define `CanvasRecorder` if `IMPELLER_TRACE_CANVAS` is not set. (flutter/engine#46476) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC chinmaygarde@google.com,rmistry@google.com,zra@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
harryterkelsen
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…s not set. (#46476) Internal bug: b/303067268 #46376 is causing a breakage to the internal engine build because of https://github.com/flutter/engine/blob/150d1b6ab51f34c07e21fc32ef76e4842edd4d04/impeller/aiks/canvas_recorder.h#L58-L62. Internally, we do not set `IMPELLER_TRACE_CANVAS`. It looks like the cause is that the internal toolchain causes the `static_assert` to be compiled even though the template is not instantiated. @chingjun helped me to figure out the following: https://stackoverflow.com/questions/5246049/c11-static-assert-and-template-instantiation points us to the spec. In the later version (ISO/IEC 14882:2017(E)): > The program is ill-formed, no diagnostic required, if ... no valid specialization can be generated for a template or a substatement of a constexpr if statement (9.4.1) within a template and the template is not instantiated, <details> <summary>The relevant section</summary>  </details> Interpretation: the compiler can either choose to emit the error caused by the `static_assert` or not. Currently the compiler used by the build here on LUCI does not; internally it does. For example, the following links shows that simply changing the Clang version affects whether the error appears or not for a minimal template. - ok: https://godbolt.org/z/n9nYrcvcP - not ok: https://godbolt.org/z/fWcvdcn35 Hence, `#ifdef` out the class instead of using a `static_assert` for more consistent behavior across these two toolchains. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style
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Internal bug: b/303067268
#46376 is causing a breakage to the internal engine build because of
engine/impeller/aiks/canvas_recorder.h
Lines 58 to 62 in 150d1b6
IMPELLER_TRACE_CANVAS.It looks like the cause is that the internal toolchain causes the
static_assertto be compiled even though the template is not instantiated.@chingjun helped me to figure out the following:
https://stackoverflow.com/questions/5246049/c11-static-assert-and-template-instantiation points us to the spec. In the later version (ISO/IEC 14882:2017(E)):
The relevant section
Interpretation: the compiler can either choose to emit the error caused by the
static_assertor not. Currently the compiler used by the build here on LUCI does not; internally it does.For example, the following links shows that simply changing the Clang version affects whether the error appears or not for a minimal template.
Hence,
#ifdefout the class instead of using astatic_assertfor more consistent behavior across these two toolchains.Pre-launch Checklist
///).If you need help, consider asking for advice on the #hackers-new channel on Discord.