[Bug c/18292] New: Cannot use function name within function.

[Bug c/18292] New: Cannot use function name within function.

[deepak at despammed dot com]

Under the said version of gcc, I cannot say something like:

void foo(int bar)
{
    extern void foo(int);

    /* do_something. */

    /* Reinstate handler. */
    signal(SIGINT, foo);
}

Output is something like:
foo.c:750: error: called object is not a function
foo.c:751: error: called object is not a function
make[1]: *** [foo.o] Error 1

-- 
           Summary: Cannot use function name within function.
           Product: gcc
           Version: 3.3.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: deepak at despammed dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: Mandrake Linux 10.0 3.3.2-6mdk
  GCC host triplet: i586-mandrake-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292

[Bug c/18292] Cannot use function name within function.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-11-03 21:06 -------
I cannot reproduce this, can you attach the preprocessed source?

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292

[Bug c/18292] Cannot use function name within function.

[deepak at despammed dot com]

------- Additional Comments From deepak at despammed dot com  2004-11-03 21:38 -------
(In reply to comment #1)
> I cannot reproduce this, can you attach the preprocessed source?

Here is the plain source:

#include <signal.h>

extern volatile sig_atomic_t pe_connection_BAD;

void
sig(int signal) {
    int omask = sigsetmask(0);	/* sigsetmask(foo): we just need omask. */
    extern void sig(int);

	switch (signal) {
	case SIGINT :
		break;
	case SIGUSR1 :
		pe_connection_BAD = 1;
	}

    sigblock(omask & ~sigmask(SIGINT));
    signal(SIGINT, sig);		/* nscli will check for it. */
    signal(SIGUSR1, sig);

}

$ cc ~/test.c -c
/home/deep/test.c: In function `sig':
/home/deep/test.c:18: error: called object is not a function
/home/deep/test.c:19: error: called object is not a function
$ 

I have added the preprocessed code to this bug report as attachment.

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292

[Bug c/18292] Cannot use function name within function.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-11-03 21:41 -------
Not a bug, you have a variable called signal which shadows the global function:
sig(int signal) {

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292

[Bug c/18292] Cannot use function name within function.

[deepak at despammed dot com]

------- Additional Comments From deepak at despammed dot com  2004-11-03 21:50 -------
(In reply to comment #4)
> Not a bug, you have a variable called signal which shadows the global function:
> sig(int signal) {

Agree.  Is it possible to change the error message to say exactly this?  For
instance, declaring a local variable under the same name as a parameter gives
this --

/home/deep/test2.c:3: warning: declaration of `bar' shadows a parameter


-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292

[Bug c/18292] Cannot use function name within function.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-11-03 21:57 -------
Use -Wshadow:
  -Wshadow                    Warn when one local variable shadows another


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18292