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Rev 816 |
/* m-un-1.c: "un" for "uninitialized" */
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/* m-un-1.c: "un" for "uninitialized" */
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/*
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/*
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From: Jim Wilson <wilson@cygnus.com>
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From: Jim Wilson <wilson@cygnus.com>
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Date: Wed, 6 Jul 1994 13:11:47 -0700
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Date: Wed, 6 Jul 1994 13:11:47 -0700
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To: dje@cygnus.com
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To: dje@cygnus.com
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Subject: Re: devo/gcc ChangeLog.fsf stmt.c
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Subject: Re: devo/gcc ChangeLog.fsf stmt.c
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Cc: cvs-gcc@cygnus.com, tege@cygnus.com
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Cc: cvs-gcc@cygnus.com, tege@cygnus.com
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How about a test case? :-)
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How about a test case? :-)
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Compile with -O -Wall and the broken compiler gives you:
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Compile with -O -Wall and the broken compiler gives you:
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tmp.c:6: warning: `k' might be used uninitialized in this function
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tmp.c:6: warning: `k' might be used uninitialized in this function
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The fixed compiler (and gcc 2.5.8) gives no warning.
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The fixed compiler (and gcc 2.5.8) gives no warning.
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This happens to fix a performance regression in the code generated for
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This happens to fix a performance regression in the code generated for
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while loops, but that is presumably much much harder to test for.
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while loops, but that is presumably much much harder to test for.
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*/
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*/
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/* { dg-do compile } */
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/* { dg-do compile } */
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/* { dg-options "-O -Wall" } */
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/* { dg-options "-O -Wall" } */
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int
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int
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sub ()
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sub ()
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{
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{
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int i = 0;
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int i = 0;
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int j = 0;
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int j = 0;
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int k; /* { dg-bogus "`k' might be used uninitialized" "uninitialized warning regression" } */
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int k; /* { dg-bogus "`k' might be used uninitialized" "uninitialized warning regression" } */
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while (i == 0 && j == 0)
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while (i == 0 && j == 0)
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{
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{
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k = 10;
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k = 10;
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i = sub ();
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i = sub ();
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}
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}
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return k;
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return k;
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}
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}
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