https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85009
Bug ID: 85009
Summary: missing -Wdiscarded-qualifiers when dropping _Atomic
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
GCC issues -Wdiscarded-qualifiers when an assignment loses the const, restrict,
or volatile qualifier but it fails to issue the same warning for the _Atomic
qualifier. Clang and Oracle CC have the same bug, but Intel ICC does give the
expected warning.
$ cat z.c && gcc -S -Wall -Wextra -Wpedantic z.c
void *p;
void
f (const int *pci, volatile int *pvi, int* restrict* pirp, _Atomic int *pai)
{
p = pci; // -Wdiscarded-qualifiers (good)
p = pvi; // -Wdiscarded-qualifiers (good)
p = pirp; // -Wdiscarded-qualifiers (good)
p = pai; // missing -Wdiscarded-qualifiers
}
z.c: In function ‘f’:
z.c:6:5: warning: assignment discards ‘const’ qualifier from pointer target
type [-Wdiscarded-qualifiers]
p = pci; // -Wdiscarded-qualifiers (good)
^
z.c:7:5: warning: assignment discards ‘volatile’ qualifier from pointer target
type [-Wdiscarded-qualifiers]
p = pvi; // -Wdiscarded-qualifiers (good)
^
z.c:8:5: warning: assignment discards ‘restrict’ qualifier from pointer target
type [-Wdiscarded-qualifiers]
p = pirp; // -Wdiscarded-qualifiers (good)
^
tmp$
