public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning
@ 2008-11-01 10:55 tkoenig at gcc dot gnu dot org
2008-11-01 12:50 ` [Bug c/37985] " rguenth at gcc dot gnu dot org
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2008-11-01 10:55 UTC (permalink / raw)
To: gcc-bugs
I would have expected a warning "statement with no effect"
for this code:
$ cat tmp.c
unsigned char foo(unsigned char a)
{
a >> 2;
return a;
}
$ gcc -S -Wall -O3 -Wextra tmp.c
$
--
Summary: unsigned char shift lacks "statement with no effect"
warning
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: enhancement
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tkoenig at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
@ 2008-11-01 12:50 ` rguenth at gcc dot gnu dot org
2009-03-30 1:38 ` tromey at gcc dot gnu dot org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2008-11-01 12:50 UTC (permalink / raw)
To: gcc-bugs
------- Comment #1 from rguenth at gcc dot gnu dot org 2008-11-01 12:48 -------
Confirmed.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2008-11-01 12:48:50
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
2008-11-01 12:50 ` [Bug c/37985] " rguenth at gcc dot gnu dot org
@ 2009-03-30 1:38 ` tromey at gcc dot gnu dot org
2009-05-21 16:32 ` [Bug c/37985] [4.3/4.4/4.5 Regression] " tkoenig at gcc dot gnu dot org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tromey at gcc dot gnu dot org @ 2009-03-30 1:38 UTC (permalink / raw)
To: gcc-bugs
------- Comment #2 from tromey at gcc dot gnu dot org 2009-03-30 01:38 -------
convert_to_integer sets TREE_NO_WARNING on the shift,
causing cc1 to later bypass the warning.
#0 convert_to_integer (type=0xb7cf62d8, expr=0xb7cee630)
at ../../trunk/gcc/convert.c:542
#1 0x080a7069 in convert (type=0xb7cf62d8, expr=0xb7cee630)
at ../../trunk/gcc/c-convert.c:101
#2 0x080a4769 in build_binary_op (location=334, code=RSHIFT_EXPR,
orig_op0=0xb7cef1e0, orig_op1=0xb7d09054, convert_p=1)
at ../../trunk/gcc/c-typeck.c:8573
#3 0x0808bb56 in parser_build_binary_op (location=334, code=RSHIFT_EXPR, arg1=
{value = 0xb7cef1e0, original_code = ERROR_MARK}, arg2=
{value = 0xb7d09054, original_code = ERROR_MARK})
at ../../trunk/gcc/c-typeck.c:2794
#4 0x080fb741 in c_parser_binary_expression (parser=0xb7d80850, after=0x0)
at ../../trunk/gcc/c-parser.c:4738
--
tromey at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tromey at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
2008-11-01 12:50 ` [Bug c/37985] " rguenth at gcc dot gnu dot org
2009-03-30 1:38 ` tromey at gcc dot gnu dot org
@ 2009-05-21 16:32 ` tkoenig at gcc dot gnu dot org
2009-05-21 16:33 ` tkoenig at gcc dot gnu dot org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2009-05-21 16:32 UTC (permalink / raw)
To: gcc-bugs
------- Comment #3 from tkoenig at gcc dot gnu dot org 2009-05-21 16:31 -------
Works with 3.4:
$ cat > tmp.c
unsigned char foo(unsigned char a)
{
a >> 2;
return a;
}
$ gcc-3.4 -S -O3 -Wall tmp.c
tmp.c: In function `foo':
tmp.c:3: warning: statement with no effect
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |4.4.0 4.5.0 4.3.3
Summary|unsigned char shift lacks |[4.3/4.4/4.5 Regression]
|"statement with no effect" |unsigned char shift lacks
|warning |"statement with no effect"
| |warning
Target Milestone|--- |4.3.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (2 preceding siblings ...)
2009-05-21 16:32 ` [Bug c/37985] [4.3/4.4/4.5 Regression] " tkoenig at gcc dot gnu dot org
@ 2009-05-21 16:33 ` tkoenig at gcc dot gnu dot org
2009-05-23 11:42 ` tkoenig at gcc dot gnu dot org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2009-05-21 16:33 UTC (permalink / raw)
To: gcc-bugs
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.3.5 |4.3.4
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (3 preceding siblings ...)
2009-05-21 16:33 ` tkoenig at gcc dot gnu dot org
@ 2009-05-23 11:42 ` tkoenig at gcc dot gnu dot org
2009-05-24 19:03 ` tkoenig at gcc dot gnu dot org
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2009-05-23 11:42 UTC (permalink / raw)
To: gcc-bugs
------- Comment #4 from tkoenig at gcc dot gnu dot org 2009-05-23 11:42 -------
AFAIK, P3 regressions cannot be "enhancement", setting
severity to "normal".
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|enhancement |normal
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (4 preceding siblings ...)
2009-05-23 11:42 ` tkoenig at gcc dot gnu dot org
@ 2009-05-24 19:03 ` tkoenig at gcc dot gnu dot org
2009-05-28 14:43 ` rguenth at gcc dot gnu dot org
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: tkoenig at gcc dot gnu dot org @ 2009-05-24 19:03 UTC (permalink / raw)
To: gcc-bugs
------- Comment #5 from tkoenig at gcc dot gnu dot org 2009-05-24 19:03 -------
Switching the "known to fail" versions around to make this bug appear
on the 4.5.0 regression list... maybe this will work.
--
tkoenig at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail|4.4.0 4.5.0 4.3.3 |4.3.3 4.4.0 4.5.0
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (5 preceding siblings ...)
2009-05-24 19:03 ` tkoenig at gcc dot gnu dot org
@ 2009-05-28 14:43 ` rguenth at gcc dot gnu dot org
2009-08-04 12:43 ` rguenth at gcc dot gnu dot org
` (2 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-05-28 14:43 UTC (permalink / raw)
To: gcc-bugs
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (6 preceding siblings ...)
2009-05-28 14:43 ` rguenth at gcc dot gnu dot org
@ 2009-08-04 12:43 ` rguenth at gcc dot gnu dot org
2010-05-22 18:27 ` [Bug c/37985] [4.3/4.4/4.5/4.6 " rguenth at gcc dot gnu dot org
2010-09-04 11:35 ` simartin at gcc dot gnu dot org
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2009-08-04 12:43 UTC (permalink / raw)
To: gcc-bugs
------- Comment #6 from rguenth at gcc dot gnu dot org 2009-08-04 12:29 -------
GCC 4.3.4 is being released, adjusting target milestone.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.3.4 |4.3.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5/4.6 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (7 preceding siblings ...)
2009-08-04 12:43 ` rguenth at gcc dot gnu dot org
@ 2010-05-22 18:27 ` rguenth at gcc dot gnu dot org
2010-09-04 11:35 ` simartin at gcc dot gnu dot org
9 siblings, 0 replies; 11+ messages in thread
From: rguenth at gcc dot gnu dot org @ 2010-05-22 18:27 UTC (permalink / raw)
To: gcc-bugs
------- Comment #7 from rguenth at gcc dot gnu dot org 2010-05-22 18:12 -------
GCC 4.3.5 is being released, adjusting target milestone.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.3.5 |4.3.6
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
* [Bug c/37985] [4.3/4.4/4.5/4.6 Regression] unsigned char shift lacks "statement with no effect" warning
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
` (8 preceding siblings ...)
2010-05-22 18:27 ` [Bug c/37985] [4.3/4.4/4.5/4.6 " rguenth at gcc dot gnu dot org
@ 2010-09-04 11:35 ` simartin at gcc dot gnu dot org
9 siblings, 0 replies; 11+ messages in thread
From: simartin at gcc dot gnu dot org @ 2010-09-04 11:35 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from simartin at gcc dot gnu dot org 2010-09-04 11:34 -------
This is due to
http://gcc.gnu.org/ml/gcc-patches/2006-08/msg01041.html
--
simartin at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |simartin at gcc dot gnu dot
| |org
Last reconfirmed|2008-12-24 05:11:57 |2010-09-04 11:34:54
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37985
^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2010-09-04 11:35 UTC | newest]
Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-11-01 10:55 [Bug c/37985] New: unsigned char shift lacks "statement with no effect" warning tkoenig at gcc dot gnu dot org
2008-11-01 12:50 ` [Bug c/37985] " rguenth at gcc dot gnu dot org
2009-03-30 1:38 ` tromey at gcc dot gnu dot org
2009-05-21 16:32 ` [Bug c/37985] [4.3/4.4/4.5 Regression] " tkoenig at gcc dot gnu dot org
2009-05-21 16:33 ` tkoenig at gcc dot gnu dot org
2009-05-23 11:42 ` tkoenig at gcc dot gnu dot org
2009-05-24 19:03 ` tkoenig at gcc dot gnu dot org
2009-05-28 14:43 ` rguenth at gcc dot gnu dot org
2009-08-04 12:43 ` rguenth at gcc dot gnu dot org
2010-05-22 18:27 ` [Bug c/37985] [4.3/4.4/4.5/4.6 " rguenth at gcc dot gnu dot org
2010-09-04 11:35 ` simartin at gcc dot gnu dot org
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).