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* [Bug c/65830] New: -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints
@ 2015-04-21 13:02 mpolacek at gcc dot gnu.org
2015-04-21 13:03 ` [Bug c/65830] " mpolacek at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-04-21 13:02 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65830
Bug ID: 65830
Summary: -Wno-shift-count-negative -Wno-shift-count-overflow
don't work with const ints
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: mpolacek at gcc dot gnu.org
When dealing with const ints, the warning can't be suppressed with
-Wno-shift-count-negative -Wno-shift-count-overflow.
A c-c++-common/ test case:
/* PR c/... */
/* { dg-do compile } */
/* { dg-options "-O -Wno-shift-count-negative -Wno-shift-count-overflow" } */
int
foo (int x)
{
const int a = sizeof (int) * __CHAR_BIT__;
const int b = -7;
int c = 0;
c += x << a; /* { dg-bogus "left shift count >= width of type" } */
c += x << b; /* { dg-bogus "left shift count is negative" } */
c += x >> a; /* { dg-bogus "right shift count >= width of type" } */
c += x >> b; /* { dg-bogus "right shift count is negative" } */
return c;
}
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/65830] -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints
2015-04-21 13:02 [Bug c/65830] New: -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints mpolacek at gcc dot gnu.org
@ 2015-04-21 13:03 ` mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-04-21 13:03 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65830
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2015-04-21
Assignee|unassigned at gcc dot gnu.org |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.0
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Taking.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/65830] -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints
2015-04-21 13:02 [Bug c/65830] New: -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints mpolacek at gcc dot gnu.org
2015-04-21 13:03 ` [Bug c/65830] " mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
@ 2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-04-24 11:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65830
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/65830] -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints
2015-04-21 13:02 [Bug c/65830] New: -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints mpolacek at gcc dot gnu.org
2015-04-21 13:03 ` [Bug c/65830] " mpolacek at gcc dot gnu.org
@ 2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-04-24 11:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65830
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Apr 24 11:53:27 2015
New Revision: 222407
URL: https://gcc.gnu.org/viewcvs?rev=222407&root=gcc&view=rev
Log:
PR c/65830
* c-common.c (c_fully_fold_internal): Use OPT_Wshift_count_negative
and OPT_Wshift_count_overflow.
* c-c++-common/pr65830.c: New test.
Added:
trunk/gcc/testsuite/c-c++-common/pr65830.c
Modified:
trunk/gcc/c-family/ChangeLog
trunk/gcc/c-family/c-common.c
trunk/gcc/testsuite/ChangeLog
^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-04-21 13:02 [Bug c/65830] New: -Wno-shift-count-negative -Wno-shift-count-overflow don't work with const ints mpolacek at gcc dot gnu.org
2015-04-21 13:03 ` [Bug c/65830] " mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
2015-04-24 11:54 ` mpolacek at gcc dot gnu.org
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