c/10436: Taking address of casted value gives error

c/10436: Taking address of casted value gives error

[bero]

>Number:         10436
>Category:       c
>Synopsis:       Taking address of casted value gives error
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Sat Apr 19 00:26:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Bernhard Rosenkraenzer
>Release:        gcc 3.3 branch as of 2003/04/15
>Organization:
>Environment:
Ark Linux Dockyard (Linux 2.4.20, glibc 2.3.2)
>Description:
The following simple code:

int test(void **tmp) { }

int main(int argc, char **argv)
{
        char *a="Test";
        test(&(void*)a);
}

gives:

test.c: In function `main':
test.c:6: error: invalid lvalue in unary `&'

This slightly longer, but equivalent variant works:
int test(void **tmp) { }

int main(int argc, char **argv)
{
        char *a="Test";
        void *b=(void*)a;
        test(&b);
}

Problem occurs with both the C and C++ front ends.
>How-To-Repeat:
Try to compile the sample code.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c/10436: Taking address of casted value gives error

[neil]

Synopsis: Taking address of casted value gives error

State-Changed-From-To: open->closed
State-Changed-By: neil
State-Changed-When: Sat Apr 19 01:06:25 2003
State-Changed-Why:
    Not a bug - the two are not equivalent; in one you're taking the address of an lvalue, in the other you're not.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10436