c/10025: gcc 3.2.2 recognizes complex functions even without complex.h

c/10025: gcc 3.2.2 recognizes complex functions even without complex.h

[Aharon Robbins]

>Number:         10025
>Category:       c
>Synopsis:       gcc 3.2.2 recognizes complex functions even without complex.h
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 11 09:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Arnold Robbins
>Release:        3.2.2
>Organization:
Pioneer Consulting Ltd.
>Environment:
System: Linux aahz 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --prefix=/usr/gcc3
>Description:
	GCC recognizes the `conj' function and complains about it, even if NO headers
	are included.
>How-To-Repeat:
	int conj(a)
	int a;
	{
		return a;
	}

	main()
	{
		printf("%d\n", conj(1));
	}

	/* Note: NO header files included. Error message is:
	 * foo.c:2: warning: conflicting types for built-in function `conj'
	 */
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:

Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h

[Richard Earnshaw]

The following reply was made to PR c/10025; it has been noted by GNATS.

From: Richard Earnshaw <rearnsha@arm.com>
To: Aharon Robbins <arnold@skeeve.com>
Cc: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org,
        gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, Richard.Earnshaw@arm.com
Subject: Re: c/10025: gcc 3.2.2 recognizes complex functions even without 
 complex.h
Date: Wed, 12 Mar 2003 12:36:15 +0000

 GCC's builtins don't need header files to access them.  So it isn't 
 possible to just disable them by not including a header.
 
 Anyway, there's no need to restrict yourself to ansi C.  Simply disable 
 the conflicting builtin:
 
 $ cat conj.c
 int conj (int a, int b);
 
 void f(){}
 
 $ gcc -c conj.c
 conj.c:1: warning: conflicting types for built-in function `conj'
 $ gcc -c conj.c -fno-builtin-conj
 $
 
 
 > Document it and call it a feature, eh?  I think it's a bug; GCC shouldn't
 > talk about conflicts with any builtin function if the header file for it
 > hasn't been included.
 > 
 > This is pretty sad.
 > 
 > Arnold
 > 
 > > Date: 11 Mar 2003 15:07:13 -0000
 > > To: arnold@skeeve.com, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
 > >    nobody@gcc.gnu.org
 > > From: bangerth@dealii.org
 > > Reply-To: bangerth@dealii.org, arnold@skeeve.com, gcc-bugs@gcc.gnu.org,
 > >    gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
 > > Subject: Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h
 > >
 > > Synopsis: gcc 3.2.2 recognizes complex functions even without complex.h
 > >
 > > State-Changed-From-To: open->closed
 > > State-Changed-By: bangerth
 > > State-Changed-When: Tue Mar 11 15:07:12 2003
 > > State-Changed-Why:
 > >     This is a gnu extension. The builtin conj function is switched
 > >     off if you use -ansi or -std=c89.
 > >     
 > >     W.
 > >
 > > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10025
 
 

Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h

[Aharon Robbins]

The following reply was made to PR c/10025; it has been noted by GNATS.

From: Aharon Robbins <arnold@skeeve.com>
To: arnold@skeeve.com, bangerth@dealii.org, gcc-bugs@gcc.gnu.org,
   gcc-gnats@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org
Cc:  
Subject: Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h
Date: Wed, 12 Mar 2003 14:15:41 +0200

 Document it and call it a feature, eh?  I think it's a bug; GCC shouldn't
 talk about conflicts with any builtin function if the header file for it
 hasn't been included.
 
 This is pretty sad.
 
 Arnold
 
 > Date: 11 Mar 2003 15:07:13 -0000
 > To: arnold@skeeve.com, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,
 >    nobody@gcc.gnu.org
 > From: bangerth@dealii.org
 > Reply-To: bangerth@dealii.org, arnold@skeeve.com, gcc-bugs@gcc.gnu.org,
 >    gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, gcc-gnats@gcc.gnu.org
 > Subject: Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h
 >
 > Synopsis: gcc 3.2.2 recognizes complex functions even without complex.h
 >
 > State-Changed-From-To: open->closed
 > State-Changed-By: bangerth
 > State-Changed-When: Tue Mar 11 15:07:12 2003
 > State-Changed-Why:
 >     This is a gnu extension. The builtin conj function is switched
 >     off if you use -ansi or -std=c89.
 >     
 >     W.
 >
 > http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10025

Re: c/10025: gcc 3.2.2 recognizes complex functions even without complex.h

[bangerth]

Synopsis: gcc 3.2.2 recognizes complex functions even without complex.h

State-Changed-From-To: open->closed
State-Changed-By: bangerth
State-Changed-When: Tue Mar 11 15:07:12 2003
State-Changed-Why:
    This is a gnu extension. The builtin conj function is switched
    off if you use -ansi or -std=c89.
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10025