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* [Bug c/57133] New: false const qualifier warning typedef
@ 2013-05-01 10:35 grpintar at gmail dot com
2013-05-01 11:38 ` [Bug c/57133] " mikpe at it dot uu.se
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: grpintar at gmail dot com @ 2013-05-01 10:35 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57133
Bug #: 57133
Summary: false const qualifier warning typedef
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: grpintar@gmail.com
typedef char *type;
void f(const type t)
{
}
int main(void)
{
const char *str = "string";
f(str);
return 0;
}
warning: passing argument 1 of 'f' discards 'const' qualifier from pointer
target type [enabled by default]
f(str);
^
note: expected 'type' but argument is of type 'const char *'
void f(const type t)
^
It is similar with gcc 4.5.3.
^ permalink raw reply [flat|nested] 4+ messages in thread* [Bug c/57133] false const qualifier warning typedef 2013-05-01 10:35 [Bug c/57133] New: false const qualifier warning typedef grpintar at gmail dot com @ 2013-05-01 11:38 ` mikpe at it dot uu.se 2013-05-01 12:04 ` redi at gcc dot gnu.org 2013-05-01 12:43 ` grpintar at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: mikpe at it dot uu.se @ 2013-05-01 11:38 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57133 --- Comment #1 from Mikael Pettersson <mikpe at it dot uu.se> 2013-05-01 11:37:56 UTC --- (In reply to comment #0) > typedef char *type; > > void f(const type t) > { This doesn't do what you think it does. t is now a const variable of type char*, not a variable of type const char*. Observe: > cat pr57133.c typedef char *type; void f(const type t) { t = 0; } void g(const type t) { *t = 0; } > gcc -Wall -S pr57133.c pr57133.c: In function 'f': pr57133.c:2:1: error: assignment of read-only parameter 't' The warning in your main() is correct. ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/57133] false const qualifier warning typedef 2013-05-01 10:35 [Bug c/57133] New: false const qualifier warning typedef grpintar at gmail dot com 2013-05-01 11:38 ` [Bug c/57133] " mikpe at it dot uu.se @ 2013-05-01 12:04 ` redi at gcc dot gnu.org 2013-05-01 12:43 ` grpintar at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: redi at gcc dot gnu.org @ 2013-05-01 12:04 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57133 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |INVALID --- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-05-01 12:04:36 UTC --- . ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/57133] false const qualifier warning typedef 2013-05-01 10:35 [Bug c/57133] New: false const qualifier warning typedef grpintar at gmail dot com 2013-05-01 11:38 ` [Bug c/57133] " mikpe at it dot uu.se 2013-05-01 12:04 ` redi at gcc dot gnu.org @ 2013-05-01 12:43 ` grpintar at gmail dot com 2 siblings, 0 replies; 4+ messages in thread From: grpintar at gmail dot com @ 2013-05-01 12:43 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57133 --- Comment #3 from grpintar at gmail dot com 2013-05-01 12:43:28 UTC --- (In reply to comment #1) > (In reply to comment #0) > > typedef char *type; > > > > void f(const type t) > > { > > This doesn't do what you think it does. t is now a const variable of type > char*, not a variable of type const char*. Observe: > > > cat pr57133.c > typedef char *type; > void f(const type t) { t = 0; } > void g(const type t) { *t = 0; } > > gcc -Wall -S pr57133.c > pr57133.c: In function 'f': > pr57133.c:2:1: error: assignment of read-only parameter 't' > > The warning in your main() is correct. I see. Sorry. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2013-05-01 12:43 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-05-01 10:35 [Bug c/57133] New: false const qualifier warning typedef grpintar at gmail dot com 2013-05-01 11:38 ` [Bug c/57133] " mikpe at it dot uu.se 2013-05-01 12:04 ` redi at gcc dot gnu.org 2013-05-01 12:43 ` grpintar at gmail dot com
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