c/6198: reaching end of main() should cause return with 0

[safari@iki.fi]

>Number:         6198
>Category:       c
>Synopsis:       reaching end of main() should cause return with 0
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Apr 05 17:36:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     safari@iki.fi
>Release:        3.0.4
>Organization:
>Environment:
Linux 2.4.19-pre3-aa2 i686

host: i686-pc-linux-gnu                                                               
build: i686-pc-linux-gnu                                                              
target: i686-pc-linux-gnu                                                             
configured with: /mnt/tmpfs/1/gcc-3.0.4/configure                                     
>Description:
http://www.opengroup.org/onlinepubs/007904975/functions/exit.html
says:
"Reaching the end of the main() function has the same behavior as calling exit(0)."

however, gcc does not set %eax register to 0 before `ret', causing (on my system) this program to return with 1:

int main(void) { }

>How-To-Repeat:

>Fix:
trivial ;-D
>Release-Note:
>Audit-Trail:
>Unformatted: