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

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

[jsm28]

Synopsis: reaching end of main() should cause return with 0

State-Changed-From-To: open->closed
State-Changed-By: jsm28
State-Changed-When: Fri Apr  5 23:16:27 2002
State-Changed-Why:
    GCC does this in C99 mode.  If you are using the
    compilation command defined by the Single Unix
    Specification, c99, it should pass an appropriate -std
    option to gcc (it's at present for distributors to
    provide such a script, GCC doesn't itself); other
    compilation commands are not in that specification.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6198

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

[safari]

>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: