[Bug c/99588] variable set but not used warning on static _Atomic assignment
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Mon Mar 15 08:55:16 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99588
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jsm28 at gcc dot gnu.org
Last reconfirmed| |2021-03-15
Status|UNCONFIRMED |NEW
Keywords| |diagnostic
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're likely confused by the "interesting" IL this emits:
;; Function test (null)
;; enabled by -tree-original
{
static atomic int x = 0;
static atomic int x = 0;
printf ((const char * restrict) "%d\n", TARGET_EXPR <D.2476, 1>;
TARGET_EXPR <D.2477, (int) __atomic_add_fetch_4 ((volatile void *) &x,
(unsigned int) TARGET_EXPR <D.2476, 1>, 5)>;, D.2477);
}
but clearly 'x' is used in the __atomic_add_fetch_4
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