[Bug c/90253] New: no warning for cv-qualified selectors in _Generic
amonakov at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Apr 25 17:25:00 GMT 2019
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90253
Bug ID: 90253
Summary: no warning for cv-qualified selectors in _Generic
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: amonakov at gcc dot gnu.org
Target Milestone: ---
Controlling expression in _Generic undergoes lvalue conversion, so it will have
const/volatile qualifiers stripped. Therefore, a qualified selector cannot
possibly match, and it might make sense to warn when a user writes one.
In the following example the function returns 0, even though the user might
have expected to distinguish 'char' vs. 'const char':
int f(const char *c)
{
return _Generic(*c, const char: 1, char: 0);
}
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