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missing warnings on switch(boolean_expr) #5562

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llvmbot opened this issue Oct 14, 2009 · 8 comments
Closed

missing warnings on switch(boolean_expr) #5562

llvmbot opened this issue Oct 14, 2009 · 8 comments
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bugzilla Issues migrated from bugzilla clang:frontend Language frontend issues, e.g. anything involving "Sema"

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@llvmbot
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llvmbot commented Oct 14, 2009

Bugzilla Link 5190
Resolution FIXED
Resolved on Mar 12, 2010 00:57
Version trunk
OS All
Depends On llvm/llvm-bugzilla-archive#5206
Reporter LLVM Bugzilla Contributor
CC @lattner

Extended Description

Clang should warn on switch(bool) since it's almost certainly wrong
(developers seem okay with using if-statements instead).

int test2(const char foo) {
int success = 0;
switch (foo && foo[0]) { / XXX */
case 0:
success = 1;
break;
case 1:
break;
}
return success;
}
@llvmbot
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llvmbot commented Oct 14, 2009

This was forked from #4779 filed by nlewycky@google.com.

@llvmbot
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llvmbot commented Oct 16, 2009

This bug depends on llvm/llvm-bugzilla-archive#5206 .

@llvmbot
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llvmbot commented Oct 16, 2009

A patch was sent to cfe-commits for review.

@lattner
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lattner commented Oct 17, 2009

according to Edward, the patch didn't apply cleanly to mainline, please update and resend when you get a chance, thanks!

@llvmbot
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llvmbot commented Oct 17, 2009

I did an 'svn up' and didn't see any conflict, so I'm not where why the patch wouldn't work for the trunk.

I just tried this in a clean svn checkout:

patch -p 0 -i pr5190.patch

and it worked fine. Could you try again? Thanks.

BTW, this patch adds a new file test/SemaCXX/switch.cpp. Don't know if this has anything to do with what Edward saw.

@llvmbot
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llvmbot commented Oct 17, 2009

proposed fix
Attached the patch file (the same as sent to cfe-commits) to the bug.

@llvmbot
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llvmbot commented Oct 17, 2009

No idea why it was not applying, so I did it by hand.

Committed in revision 84346.

Many thanks,
Edward.

@llvmbot
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llvmbot commented Nov 27, 2021

mentioned in issue llvm/llvm-bugzilla-archive#5206

@llvmbot llvmbot transferred this issue from llvm/llvm-bugzilla-archive Dec 3, 2021
daniel-grumberg pushed a commit to daniel-grumberg/llvm-project that referenced this issue Nov 7, 2022
@medismailben
Merge pull request llvm#5562 from medismailben/stable/20220421
b189c45 
Cherry-pick many LLDB improvements
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