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* [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0)
@ 2003-12-05 22:29 falk at debian dot org
2003-12-05 22:53 ` [Bug c/13325] " pinskia at gcc dot gnu dot org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: falk at debian dot org @ 2003-12-05 22:29 UTC (permalink / raw)
To: gcc-bugs
gcc (GCC) 3.5-tree-ssa 20031205 (merged 20031130) on alphaev68-unknown-linux-gnu
falk@juist:/tmp% cat test.c
void *memcpy(void *dest, const void *src, __SIZE_TYPE__ n);
void f (void *dest, const void *src) {
memcpy (dest, src, 0);
}
falk@juist:/tmp% gcc -c -W test.c
test.c: In function `f':
test.c:3: warning: statement with no effect
Well yeah, it has no effect, but things like these are often created by macros.
It seems unlikely that it marks a real mistake. Similar for memcmp etc.
--
Summary: [tree-ssa] Weird warning on memcpy(d, s, 0)
Product: gcc
Version: tree-ssa
Status: UNCONFIRMED
Keywords: diagnostic
Severity: minor
Priority: P2
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: falk at debian dot org
CC: gcc-bugs at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c/13325] [tree-ssa] Weird warning on memcpy(d, s, 0)
2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
@ 2003-12-05 22:53 ` pinskia at gcc dot gnu dot org
2003-12-05 23:48 ` [Bug middle-end/13325] " pinskia at gcc dot gnu dot org
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-05 22:53 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-05 22:53 -------
Confirmed, the problem is how do we really decide what to warn about and what not to warn
about, there are some regressions because we do not warn about some times.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Last reconfirmed|0000-00-00 00:00:00 |2003-12-05 22:53:35
date| |
Target Milestone|--- |tree-ssa
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug middle-end/13325] [tree-ssa] Weird warning on memcpy(d, s, 0)
2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
2003-12-05 22:53 ` [Bug c/13325] " pinskia at gcc dot gnu dot org
@ 2003-12-05 23:48 ` pinskia at gcc dot gnu dot org
2004-02-03 6:03 ` rth at gcc dot gnu dot org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu dot org @ 2003-12-05 23:48 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-05 23:48 -------
This is a middle-end issue :) (as fold-const is part of the middle-end).
--
What |Removed |Added
----------------------------------------------------------------------------
Component|c |middle-end
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug middle-end/13325] [tree-ssa] Weird warning on memcpy(d, s, 0)
2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
2003-12-05 22:53 ` [Bug c/13325] " pinskia at gcc dot gnu dot org
2003-12-05 23:48 ` [Bug middle-end/13325] " pinskia at gcc dot gnu dot org
@ 2004-02-03 6:03 ` rth at gcc dot gnu dot org
2004-02-04 2:24 ` cvs-commit at gcc dot gnu dot org
2004-02-04 2:31 ` rth at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: rth at gcc dot gnu dot org @ 2004-02-03 6:03 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rth at gcc dot gnu dot org 2004-02-03 06:03 -------
Working on it.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |rth at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug middle-end/13325] [tree-ssa] Weird warning on memcpy(d, s, 0)
2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
` (2 preceding siblings ...)
2004-02-03 6:03 ` rth at gcc dot gnu dot org
@ 2004-02-04 2:24 ` cvs-commit at gcc dot gnu dot org
2004-02-04 2:31 ` rth at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu dot org @ 2004-02-04 2:24 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From cvs-commit at gcc dot gnu dot org 2004-02-04 02:24 -------
Subject: Bug 13325
CVSROOT: /cvs/gcc
Module name: gcc
Branch: tree-ssa-20020619-branch
Changes by: rth@gcc.gnu.org 2004-02-04 02:24:28
Modified files:
gcc : ChangeLog.tree-ssa builtins.c c-simplify.c
c-typeck.c stmt.c tree.h
gcc/cp : ChangeLog.tree-ssa call.c cvt.c init.c typeck.c
Added files:
gcc/testsuite/g++.dg/warn: noeffect5.C
gcc/testsuite/gcc.dg: 20040202-1.c
Log message:
PR middle-end/13325
* builtins.c (fold_builtin_1): Rename from fold_builtin.
(fold_builtin): New.
* c-simplify.c (gimplify_expr_stmt): Check TREE_NO_WARNING.
* stmt.c (expand_expr_stmt_value): Likewise.
* tree.h (struct tree_common): Add nowarning_flag.
(TREE_NO_WARNING): New.
(TREE_NO_UNUSED_WARNING): Remove.
* c-typeck.c (build_unary_op): Use TREE_NO_WARNING instead.
* stmt.c (warn_if_unused_value): Likewise.
cp/
* call.c, cvt.c, init.c, typeck.c: Use TREE_NO_WARNING instead
of TREE_NO_UNUSED_WARNING.
* cvt.c (convert_to_void): Also use it for "has no effect" warning.
testsuite/
* g++.dg/warn/noeffect5.C: New.
* gcc.dg/20040202-1.c: New.
Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.tree-ssa.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.2.1146&r2=1.1.2.1147
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/builtins.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.152.2.47&r2=1.152.2.48
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-simplify.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.4.90&r2=1.1.4.91
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/c-typeck.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.196.2.37&r2=1.196.2.38
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/stmt.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.267.2.45&r2=1.267.2.46
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.h.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.342.2.165&r2=1.342.2.166
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.tree-ssa.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.1.2.67&r2=1.1.2.68
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/call.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.320.2.41&r2=1.320.2.42
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/cvt.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.118.2.20&r2=1.118.2.21
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/init.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.281.2.35&r2=1.281.2.36
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/typeck.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=1.408.2.39&r2=1.408.2.40
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/warn/noeffect5.C.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=NONE&r2=1.1.2.1
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/gcc.dg/20040202-1.c.diff?cvsroot=gcc&only_with_tag=tree-ssa-20020619-branch&r1=NONE&r2=1.1.2.1
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug middle-end/13325] [tree-ssa] Weird warning on memcpy(d, s, 0)
2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
` (3 preceding siblings ...)
2004-02-04 2:24 ` cvs-commit at gcc dot gnu dot org
@ 2004-02-04 2:31 ` rth at gcc dot gnu dot org
4 siblings, 0 replies; 6+ messages in thread
From: rth at gcc dot gnu dot org @ 2004-02-04 2:31 UTC (permalink / raw)
To: gcc-bugs
------- Additional Comments From rth at gcc dot gnu dot org 2004-02-04 02:31 -------
http://gcc.gnu.org/ml/gcc-patches/2004-02/msg00262.html
--
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13325
^ permalink raw reply [flat|nested] 6+ messages in thread
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2003-12-05 22:29 [Bug c/13325] New: [tree-ssa] Weird warning on memcpy(d, s, 0) falk at debian dot org
2003-12-05 22:53 ` [Bug c/13325] " pinskia at gcc dot gnu dot org
2003-12-05 23:48 ` [Bug middle-end/13325] " pinskia at gcc dot gnu dot org
2004-02-03 6:03 ` rth at gcc dot gnu dot org
2004-02-04 2:24 ` cvs-commit at gcc dot gnu dot org
2004-02-04 2:31 ` rth at gcc dot gnu dot org
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