https://bugs.llvm.org/show_bug.cgi?id=49454
Bug ID: 49454
Summary: C++20 `[[likely]]`/`[[unlikely]]` `case` statements
erroneously fail to compile in the presence of
`[[fallthrough]]`
Product: new-bugs
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
See the following complete example:
//Compile with "-std=c++20"
void f(int i) {
switch (i) {
[[likely]] case 1:
[[fallthrough]];
case 2:
break;
}
}
This should compile (and does on every other compiler), but doesn't on Clang.
Clang (tested 13.0.0) produces:
<source>:5:13: error: fallthrough annotation does not directly precede
switch label
[[fallthrough]];
^
Removing either `[[likely]]` or `[[fallthrough]];` is sufficient to cause the
compile to succeed.
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