https://bugs.llvm.org/show_bug.cgi?id=40137
Bug ID: 40137
Summary: False -Wunsequenced positive when combining comma and
logical or
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: tony.wasse...@gmx.de
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Combining the comma operator with || seems to trigger false positives for
-Wunsequenced quite easily, see https://godbolt.org/z/azvBIZ for an example.
Both , and || should sequence their operands, so the warning is unjustified in
this case.
Example code:
int idx = 0;
bool result = ((idx++, false) || (idx++, false));
( NB: This problem in particular shows up when trying to use fold expressions
to emulate if-elseif cascades via short-circuiting of ||, e.g. "((idx++,
are_we_done_yet(idx)) || ...)". )
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