Silence [[fallthrough]] warnings - #3162
Merged
Stephan T. Lavavej (StephanTLavavej) merged 4 commits intoOct 24, 2022
Merged
Stephan T. Lavavej (StephanTLavavej) merged 4 commits into
Stephan T. Lavavej (StephanTLavavej) merged 4 commits into
Conversation
warning C5262: implicit fall-through occurs here; are you missing a break statement? Use [[fallthrough]] when a break statement is intentionally omitted between cases
Stephan T. Lavavej (StephanTLavavej)
requested a review
from a team
as a code owner
October 19, 2022 08:52
Casey Carter (CaseyCarter)
approved these changes
Oct 19, 2022
Member
Author
|
I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed. |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
MSVC has implemented a new off-by-default "warning C5262: implicit fall-through occurs here; are you missing a
breakstatement? Use[[fallthrough]]when abreakstatement is intentionally omitted betweencases". While we don't attempt to be/Wallclean in general, this warning is high value (capable of detecting bugs in product code!) and easy to avoid.Much of our C++17-and-later code is already using the
[[fallthrough]]attribute. For our older code, I'm introducing a_FALLTHROUGHmacro.In
VSO_0226079_mutex, we can simply avoid fallthrough by repeating a bit of code.Adding
/w15262totests/universal_prefix.lstprovides comprehensive test coverage.Finally, we need to silence fallthrough warnings in
variantafter_STL_UNREACHABLE- these are the only occurrences that weren't already commented.Reported as DevCom-10163250 and internal VSO-1644941 / AB#1644941 .