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| Message-ID | <4E8EA17E.56DD@mindspring.com> (permalink) |
|---|---|
| Date | 2011-10-07 02:51 -0400 |
| From | pete <pfiland@mindspring.com> |
| Organization | PF |
| Newsgroups | comp.lang.c |
| Subject | Re: initialization of local static variable |
| References | <16f1e150-05c8-4e30-a0e3-17aa3182f14d@d28g2000vby.googlegroups.com> |
V.Subramanian, India wrote:
>
> consider the following program x.c:
> #include <stdlib.h>
> #include <stdio.h>
>
> char first[] = "test message";
>
> void display(void)
> {
> static char* p_first = first + 5;
>
> printf("%s\n", p_first);
>
> char second[] = "new message";
> static char* p_second = second + 4;
>
> printf("%s\n", p_second);
>
> return;
> }
>
> int main()
> {
> display();
>
> return EXIT_SUCCESS;
> }
>
> When this program is compiled with
> gcc (GCC) 3.4.3 20050227 (Red Hat 3.4.3-22.1)
> as
> gcc -std=c99 -pedantic -Wall -Wextra x.c
> it generates the following error:
> x.c: In function `display':
> x.c:13: error: initializer element is not constant
>
> The compiler accepts the initialization of the local static variable
> 'p_first' in 'display()' function. However the compiler reports error
> for the initializtion of the local static variable 'p_second' in
> 'display()' function.
>
> In the case of 'p_first', the array name 'first' decays into a pointer
> to the first element and so in this case ALSO the memory address
> stored in p_first will be known only at run-time(similar to that of
> 'p_second'). So why doesn't the compiler flag this as an error ?
>
> Please clarify.
ISO/IEC 9899
6.6 Constant expressions
9 An address constant is a null pointer, a pointer to an lvalue
designating an object of static storage duration,
or a pointer to a function designator;
it shall be created explicitly using the unary & operator
or an integer constant cast to pointer type,
or implicitly by the use of an expression of array or function type.
--
pete
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initialization of local static variable "V.Subramanian, India" <subramanian100in@yahoo.com> - 2011-10-06 23:33 -0700
Re: initialization of local static variable pete <pfiland@mindspring.com> - 2011-10-07 02:51 -0400
Re: initialization of local static variable "BartC" <bc@freeuk.com> - 2011-10-07 10:44 +0100
Re: initialization of local static variable China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-10-07 03:03 -0700
Re: initialization of local static variable "BartC" <bc@freeuk.com> - 2011-10-07 11:33 +0100
Re: initialization of local static variable jt@toerring.de (Jens Thoms Toerring) - 2011-10-07 11:11 +0000
Re: initialization of local static variable "BartC" <bc@freeuk.com> - 2011-10-07 12:51 +0100
Re: initialization of local static variable jt@toerring.de (Jens Thoms Toerring) - 2011-10-07 15:56 +0000
Re: initialization of local static variable Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-07 20:29 +0100
Re: initialization of local static variable jacob navia <jacob@spamsink.net> - 2011-10-07 21:38 +0200
Re: initialization of local static variable Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-07 21:16 +0100
Re: initialization of local static variable jacob navia <jacob@spamsink.net> - 2011-10-07 22:22 +0200
Re: initialization of local static variable jt@toerring.de (Jens Thoms Toerring) - 2011-10-07 22:25 +0000
Re: initialization of local static variable jacob navia <jacob@spamsink.net> - 2011-10-08 00:40 +0200
Re: initialization of local static variable Ian Collins <ian-news@hotmail.com> - 2011-10-08 11:56 +1300
Re: initialization of local static variable jacob navia <jacob@spamsink.net> - 2011-10-08 01:53 +0200
Re: initialization of local static variable Jens Gustedt <jens.gustedt@loria.fr> - 2011-10-09 23:04 +0200
Re: initialization of local static variable Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-10-10 11:54 -0500
Re: initialization of local static variable Ike Naar <ike@sverige.freeshell.org> - 2011-10-10 17:41 +0000
Re: initialization of local static variable Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-10-10 17:35 -0500
Re: initialization of local static variable jt@toerring.de (Jens Thoms Toerring) - 2011-10-08 00:02 +0000
Re: initialization of local static variable "BartC" <bc@freeuk.com> - 2011-10-08 01:26 +0100
Re: initialization of local static variable "Philip Lantz" <prl@canterey.us> - 2011-10-08 03:01 -0700
Re: initialization of local static variable "BartC" <bc@freeuk.com> - 2011-10-07 21:42 +0100
Re: initialization of local static variable China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-10-07 16:25 -0700
Re: initialization of local static variable jacob navia <jacob@spamsink.net> - 2011-10-08 01:51 +0200
Re: initialization of local static variable China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-10-07 18:21 -0700
Re: initialization of local static variable Nobody <nobody@nowhere.com> - 2011-10-08 15:36 +0100
Re: initialization of local static variable Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-08 22:06 +0100
Re: initialization of local static variable Nobody <nobody@nowhere.com> - 2011-10-09 05:35 +0100
Re: initialization of local static variable Ben Bacarisse <ben.usenet@bsb.me.uk> - 2011-10-09 09:25 +0100
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-09 11:00 +0200
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-09 10:56 -0700
Re: initialization of local static variable James Kuyper <jameskuyper@verizon.net> - 2011-10-09 14:30 -0400
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-09 21:43 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-10 19:08 +0200
Re: initialization of local static variable Geoff <geoff@invalid.invalid> - 2011-10-10 16:16 -0700
Re: initialization of local static variable Ike Naar <ike@iceland.freeshell.org> - 2011-10-10 23:22 +0000
Re: initialization of local static variable James Kuyper <jameskuyper@verizon.net> - 2011-10-10 20:40 -0400
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-10 20:54 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-11 18:45 +0200
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-11 18:51 +0200
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-11 18:52 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-12 08:49 +0200
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-11 19:48 +0200
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-11 21:25 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-12 08:48 +0200
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-12 08:54 +0200
Re: initialization of local static variable pete <pfiland@mindspring.com> - 2011-10-12 20:55 -0400
Re: initialization of local static variable Barry Schwarz <schwarzb@dqel.com> - 2011-10-11 18:52 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-11 19:55 +0200
Re: initialization of local static variable Keith Thompson <kst-u@mib.org> - 2011-10-11 11:24 -0700
Re: initialization of local static variable Keith Thompson <kst-u@mib.org> - 2011-10-11 12:47 -0700
Re: initialization of local static variable "io_x" <a@b.c.invalid> - 2011-10-12 08:49 +0200
Re: initialization of local static variable Tim Rentsch <txr@alumni.caltech.edu> - 2012-01-24 16:09 -0800
Re: initialization of local static variable China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-10-07 16:06 -0700
Re: initialization of local static variable Seebs <usenet-nospam@seebs.net> - 2011-10-12 22:25 +0000
Re: initialization of local static variable "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-10-13 07:09 -0700
Re: initialization of local static variable Seebs <usenet-nospam@seebs.net> - 2011-10-17 17:21 +0000
Re: initialization of local static variable Joe Wright <joewwright@comcast.net> - 2011-10-14 14:27 -0400
Re: initialization of local static variable Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-08 00:03 -0400
Re: initialization of local static variable China Blue Corn Chips <chine.bleu@yahoo.com> - 2011-10-08 01:27 -0700
Re: initialization of local static variable Richard Damon <news.x.richarddamon@xoxy.net> - 2011-10-08 00:08 -0400
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