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* [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *"
@ 2005-11-07 23:37 joshudson at gmail dot com
2005-11-08 0:07 ` [Bug c/24727] " schwab at suse dot de
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: joshudson at gmail dot com @ 2005-11-07 23:37 UTC (permalink / raw)
To: gcc-bugs
Tried this on two machines:
SunOS hornet 5.10 Generic sun4u sparc SUNW,Ultra-4
with GCC 4.0.1
Linux numenor 2.6.13 #9 Mon Sep 19 19:03:35 PDT 2005 i686 unknown unknown
GNU/Linux
with GCC 3.3.6
The following code produces spurios warning:
/* Cut here */
int x_read(int h, void *buf, unsigned len);
int x_write(int h, const void *buf, unsigned len);
typedef int (*x_io)(int h, void *buf, unsigned len);
int blockio(int h, long long offset, void *buf, x_io action);
int bug(int h, unsigned where, void *buf)
{
return blockio(h, (long long)where << 10, buf, x_write);
}
/* Cut here */
sample.c: In function `bug':
sample.c:9: warning: passing arg 4 of `blockio' from incompatible pointer type
--
Summary: type "const void *" produces a warning when promoting to
"void *"
Product: gcc
Version: 4.0.1
Status: UNCONFIRMED
Severity: trivial
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: joshudson at gmail dot com
GCC host triplet: Multiple
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727
^ permalink raw reply [flat|nested] 6+ messages in thread* [Bug c/24727] type "const void *" produces a warning when promoting to "void *" 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com @ 2005-11-08 0:07 ` schwab at suse dot de 2005-11-08 4:25 ` joshudson at gmail dot com ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: schwab at suse dot de @ 2005-11-08 0:07 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from schwab at suse dot de 2005-11-08 00:07 ------- The warning is correct. The type of x_write is incompatible with x_io, because "const void *" is incompatible with "void *". Argument promotion does not come into play here. -- schwab at suse dot de changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c/24727] type "const void *" produces a warning when promoting to "void *" 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com 2005-11-08 0:07 ` [Bug c/24727] " schwab at suse dot de @ 2005-11-08 4:25 ` joshudson at gmail dot com 2005-11-08 4:34 ` pinskia at gcc dot gnu dot org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: joshudson at gmail dot com @ 2005-11-08 4:25 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from joshudson at gmail dot com 2005-11-08 04:25 ------- Aren't function arguments contravariant rather than covariant? -- joshudson at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |UNCONFIRMED Resolution|INVALID | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c/24727] type "const void *" produces a warning when promoting to "void *" 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com 2005-11-08 0:07 ` [Bug c/24727] " schwab at suse dot de 2005-11-08 4:25 ` joshudson at gmail dot com @ 2005-11-08 4:34 ` pinskia at gcc dot gnu dot org 2005-12-07 17:08 ` pinskia at gcc dot gnu dot org 2005-12-07 17:09 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-11-08 4:34 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2005-11-08 04:34 ------- No, in C, these are two different function types. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c/24727] type "const void *" produces a warning when promoting to "void *" 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com ` (2 preceding siblings ...) 2005-11-08 4:34 ` pinskia at gcc dot gnu dot org @ 2005-12-07 17:08 ` pinskia at gcc dot gnu dot org 2005-12-07 17:09 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-07 17:08 UTC (permalink / raw) To: gcc-bugs ------- Comment #4 from pinskia at gcc dot gnu dot org 2005-12-07 17:08 ------- Reoepening to ... -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |UNCONFIRMED Resolution|INVALID | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c/24727] type "const void *" produces a warning when promoting to "void *" 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com ` (3 preceding siblings ...) 2005-12-07 17:08 ` pinskia at gcc dot gnu dot org @ 2005-12-07 17:09 ` pinskia at gcc dot gnu dot org 4 siblings, 0 replies; 6+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-12-07 17:09 UTC (permalink / raw) To: gcc-bugs ------- Comment #5 from pinskia at gcc dot gnu dot org 2005-12-07 17:09 ------- To Close as a dup of bug 16895. *** This bug has been marked as a duplicate of 16895 *** -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |DUPLICATE http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24727 ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2005-12-07 17:09 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-11-07 23:37 [Bug c/24727] New: type "const void *" produces a warning when promoting to "void *" joshudson at gmail dot com 2005-11-08 0:07 ` [Bug c/24727] " schwab at suse dot de 2005-11-08 4:25 ` joshudson at gmail dot com 2005-11-08 4:34 ` pinskia at gcc dot gnu dot org 2005-12-07 17:08 ` pinskia at gcc dot gnu dot org 2005-12-07 17:09 ` pinskia at gcc dot gnu dot org
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