Re: c/7475: gcc compiles illegal source code without generating any warnings

Re: c/7475: gcc compiles illegal source code without generating any warnings

[paolo]

Synopsis: gcc compiles illegal source code without generating any warnings

Responsible-Changed-From-To: unassigned->paolo
Responsible-Changed-By: paolo
Responsible-Changed-When: Fri Aug  2 13:58:03 2002
Responsible-Changed-Why:
    Triaged.
State-Changed-From-To: open->closed
State-Changed-By: paolo
State-Changed-When: Fri Aug  2 13:58:03 2002
State-Changed-Why:
    Please peruse the man/info sections on the various Warning
    options.
    paolo:~> gcc -Wall -pedantic 7475.c
    7475.c: In function `bar':
    7475.c:4: warning: ISO C89 forbids variable-size array `a'
    7475.c:4: warning: ISO C89 forbids variable-size array `a'
    7475.c:7: warning: control reaches end of non-void function
    7475.c: In function `foo':
    7475.c:13: warning: control reaches end of non-void function

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7475

c/7475: gcc compiles illegal source code without generating any warnings

[geneing]

>Number:         7475
>Category:       c
>Synopsis:       gcc compiles illegal source code without generating any warnings
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 02 12:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     geneing@myrealbox.com
>Release:        2.95.3 and 3.1
>Organization:
>Environment:
any
>Description:
compiler does not warn about illegal code and missing return statements. Attached program is missing a return statement in function foo (for some clauses) and ambiguous declaration of an array in function bar. Neither generates any warnings. 
>How-To-Repeat:
gcc bug.c
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/plain; name="bug.c"
Content-Disposition: inline; filename="bug.c"


int bar( void )
{
	int i,j;
	int a[i][j];

	a[1][2]=5;
}

int foo( int j )
{
	if( j == 5 )
		return 7;
}

int main( void )
{
	bar();
	foo( 5 );
	foo( 6 );
	return 0;
}