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Date: Tue, 20 May 2003 12:36:00 -0000
From: dirkjan@magma-da.com
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Subject: c++/10882: passing and return by reference of char pointer corrupted on x86_64
X-SW-Source: 2003-05/txt/msg02164.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10882
>Category:       c++
>Synopsis:       passing and return by reference of char pointer corrupted on x86_64
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue May 20 12:36:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     dirkjan@magma-da.com
>Release:        gcc-3.2.2 and gcc-3.3
>Organization:
>Environment:
Reading specs from /home/dirkjan/compiler/opteron/gcc-3.2.2/lib/gcc-lib/x86_64-u
nknown-linux-gnu/3.2.2/specs
Configured with: ./configure --prefix=/home/dirkjan/compiler/opteron/gcc-3.2.2 -
-disable-multilib --enable-languages=c,c++
Thread model: posix
gcc version 3.2.2
>Description:
compilation of the following source results in overwriting the char pointer of name. using the second_function there is no problem as well after interchanging the order of the two statements in get_string

include <iostream>
using namespace std;

char* name;
char* ret_string="returned string";


void* first_function(void **data)
{
    *data=ret_string;
}

void* second_function(int *data)
{
    data=0;
}

void* third_function(void **data)
{
    *data=0;
}

void get_string(){
    char* popped_name;
    int number;
    first_function((void**)&popped_name);
    //second_function(&number);
    third_function((void**)&number);
    name=popped_name;
}

main()
{
    cout<<"start test"<<endl;
    name="initial_name";
    cout<<"name is "<<name<<endl;
    get_string();
    cout<<"name is after functions "<<name<<endl;
}
>How-To-Repeat:
this does only fail on the opteron/x86_64
compilation and run will show the last cout not printing name
>Fix:

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