38 lines
851 B
C
38 lines
851 B
C
/* m-un-1.c: "un" for "uninitialized" */
|
|
|
|
/*
|
|
From: Jim Wilson <wilson@cygnus.com>
|
|
Date: Wed, 6 Jul 1994 13:11:47 -0700
|
|
To: dje@cygnus.com
|
|
Subject: Re: devo/gcc ChangeLog.fsf stmt.c
|
|
Cc: cvs-gcc@cygnus.com, tege@cygnus.com
|
|
|
|
How about a test case? :-)
|
|
|
|
Compile with -O -Wall and the broken compiler gives you:
|
|
tmp.c:6: warning: `k' might be used uninitialized in this function
|
|
The fixed compiler (and gcc 2.5.8) gives no warning.
|
|
|
|
This happens to fix a performance regression in the code generated for
|
|
while loops, but that is presumably much much harder to test for.
|
|
*/
|
|
|
|
/* { dg-do compile } */
|
|
/* { dg-options "-O -Wall" } */
|
|
|
|
int
|
|
sub ()
|
|
{
|
|
int i = 0;
|
|
int j = 0;
|
|
int k; /* { dg-bogus "`k' might be used uninitialized" "uninitialized warning regression" } */
|
|
|
|
while (i == 0 && j == 0)
|
|
{
|
|
k = 10;
|
|
i = sub ();
|
|
}
|
|
|
|
return k;
|
|
}
|