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Date: Fri, 25 Jun 2004 22:22:00 -0000
From: "netletter at comder dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20040625222005.16211.netletter@comder.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/16211] New: If mixing templates and va_list (va_arg) and char* string you wont be happy
X-Bugzilla-Reason: CC
X-SW-Source: 2004-06/txt/msg03281.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

I hope I do not offend anyone, but this code seems to segfault. Im not even sure
what this form wants as host triplet. I read the guidlines, and got the picture
that you do not want source, but I cant explain this any other way. Well here
goes, hope Ill not make a total fool of myself.

The crash comes from an invalid address returned by va_arg( ). Undefine CRASH to
see it work as expected.

gcc version 3.3 20030226 (prerelease) (SuSE Linux)

------------ Code snipet ---------------
#include <stdarg.h> //	va_list
#include <stdio.h>

#define CRASH

void func( const char *str,... );

#ifdef CRASH
template< class TYPE > bool FormTest( const char* str,char* i )
{
	func( str,i );
	return true;
}
#else
bool FormTest( const char* str,char* i )
{
	func( str,i );
	return true;
}
#endif

int main( void )
{
#ifdef CRASH
	FormTest< char* >( "%s\n","string" );
#else
	FormTest( "%s\n","string" );
#endif
}

void func( const char *str,va_list &ap );

void func( const char *str,... )
{
	va_list ap; va_start( ap,str );
	func( str,ap );
	va_end( ap );
}

void func( const char *str,va_list &ap )
{
	const char *pek; int i;
	pek=va_arg( ap,const char* ); printf( str,pek );
}

-- 
           Summary: If mixing templates and va_list (va_arg) and char*
                    string you wont be happy
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: netletter at comder dot com
                CC: gcc-bugs at gcc dot gnu dot org
  GCC host triplet: /lib/ld-linux.so.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16211