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* [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function
@ 2015-02-23 20:37 tisaac at ices dot utexas.edu
  2015-02-23 23:04 ` [Bug middle-end/65182] " manu at gcc dot gnu.org
                   ` (5 more replies)
  0 siblings, 6 replies; 7+ messages in thread
From: tisaac at ices dot utexas.edu @ 2015-02-23 20:37 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

            Bug ID: 65182
           Summary: -Wuninitialized fails when pointer to variable later
                    passed to function
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tisaac at ices dot utexas.edu

Created attachment 34848
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34848&action=edit
Test program that demonstrates -Wuninitialized failure

If a pointer to a variable is passed *after* it is used uninitialized, then
-Wuninitialized fails to report.

Test code:

>cat test.c

#include <stdio.h>
#include <stdlib.h>

void
bar(int *a)
{
  *a = 2;
}

int
baz (void)
{
  return 3;
}

void
foo(int *b)
{
  int a;

  if (a) {
    *b = 0;
    return;
  }

#if defined(USE_AS_POINTER)
  bar(&a);
#endif

  a = baz();

  *b = a + 2;
}

int
main (int argc, char **argv)
{
  int c;

  c = atoi(argv[1]);

  foo(&c);

  return c;
}

>gcc-4.9 -O0 -Wuninitialized -c -o test.o test.c

test.c: In function ‘foo’:
test.c:21:6: warning: ‘a’ is used uninitialized in this function
[-Wuninitialized]
   if (a) {
      ^
>gcc-4.9 -DUSE_AS_POINTER -O0 -Wuninitialized -c -o test.o test.c

[no output]

>uname --all

Linux alembic 3.2.0-76-generic #111-Ubuntu SMP Tue Jan 13 22:16:09 UTC 2015
x86_64 x86_64 x86_64 GNU/Linux

>gcc-4.9 --version

gcc-4.9 (Ubuntu 4.9.2-0ubuntu1~12.04) 4.9.2
Copyright (C) 2014 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>From gcc-bugs-return-478215-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 23 19:23:28 2015
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/64158] [5 Regression] FAIL: gcc.dg/pr44194-1.c scan-rtl-dump dse1 "global deletions = (2|3)"
Date: Mon, 23 Feb 2015 20:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd158

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |msebor at gcc dot gnu.org

--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
FWIW, I looked into this failure a bit over the weekend and found the
expression hard enough to read that I broke it up like so:

Index: gcc.dg/pr44194-1.c
==================================================================--- gcc.dg/pr44194-1.c    (revision 220914)
+++ gcc.dg/pr44194-1.c    (working copy)
@@ -1,8 +1,13 @@
-/* { dg-do compile { target { { { { { { { { { { i?86-*-* x86_64-*-* } && x32 }
|| lp64 } && { ! s390*-*-* } } && { ! hppa*64*-*-* } } && { ! alpha*-*-* } } &&
{ { ! powerpc*-*-linux* } || powerpc_elfv2 } } && { ! nvptx-*-* } } } } } } */
+/* { dg-do compile { target { lp64 || x32 } } } */
+/* { dg-skip-if "" { alpha*-*-*-* } { "*" } { "" } } */
+/* { dg-skip-if "" { hppa*64*-*-*-* } { "*" } { "" } } */
+/* { dg-skip-if "" { powerpc*-*-linux* && { ! powerpc_elfv2 } } { "*" } { "" }
} */
+/* { dg-skip-if "" { s390*-*-* } { "*" } { "" } } */
+/* { dg-skip-if "" { nvptx-*-* } { "*" } { "" } } */
 /* { dg-options "-O2 -fdump-rtl-dse1 -fdump-rtl-final" } */

-/* Restrict to 64-bit targets since 32-bit targets usually return small
-   structures in memory.  */
+/* Restrict to a subset of 64-bit targets since 32-bit targets usually
+   return small structures in memory (Intel x32 being an exception).  */

 struct ints { int a, b, c; } foo();
 void bar(int a, int b);


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
@ 2015-02-23 23:04 ` manu at gcc dot gnu.org
  2015-02-24  3:42 ` manu at gcc dot gnu.org
                   ` (4 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: manu at gcc dot gnu.org @ 2015-02-23 23:04 UTC (permalink / raw)
  To: gcc-bugs

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="UTF-8", Size: 5575 bytes --]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |manu at gcc dot gnu.org
         Resolution|---                         |DUPLICATE

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Unfortunately, this is a very old bug that no one has figured out how to fix.
Some thinking out of the box is probably needed since we GCC devs have failed
to find a solution for the last 10 years. You are welcome to try if you are up
for a challenge.

*** This bug has been marked as a duplicate of bug 19430 ***
>From gcc-bugs-return-478234-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 23 22:46:48 2015
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/19430] taking address of a var causes missing uninitialized warning
Date: Mon, 23 Feb 2015 23:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=19430

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tisaac at ices dot utexas.edu

--- Comment #28 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
*** Bug 65182 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-478235-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 23 22:58:41 2015
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From: "mmminor at sbcglobal dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/65185] New: avr-gcc mcus.def missing rfr2 devices
Date: Tue, 24 Feb 2015 00:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide185

            Bug ID: 65185
           Summary: avr-gcc mcus.def missing rfr2 devices
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mmminor at sbcglobal dot net

Created attachment 34851
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id4851&actioníit
Add missing avr devices.

Patches for atmega256rfr2
(https://gcc.gnu.org/ml/gcc-patches/2013-03/msg00788.html) were never
committed. Need patches to gcc/config/avr/avr-mcus.def as attached.


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
  2015-02-23 23:04 ` [Bug middle-end/65182] " manu at gcc dot gnu.org
@ 2015-02-24  3:42 ` manu at gcc dot gnu.org
  2015-02-24  5:10 ` amodra at gcc dot gnu.org
                   ` (3 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: manu at gcc dot gnu.org @ 2015-02-24  3:42 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|DUPLICATE                   |---

--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Ops, I got confused by the testcase and this is not actually a duplicate.

void bar(int *a);

int baz (void);

void
foo(int *b)
{
  int a;

  if (a) {
    *b = 0;
    return;
  }

  bar(&a);

  a = baz();

  *b = a + 2;
}

In gcc 4.9.2 you need at least -O1 to get a warning, however, it seems that in
GCC 5.0 r220306, -O0 is enough. Thus, I would consider this fixed.
>From gcc-bugs-return-478240-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 23 23:25:35 2015
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From: "kkojima at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/65153] [SH][4.9 Regression] "insn does not satisfy its constraints" when compiling libmcrypt
Date: Tue, 24 Feb 2015 04:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide153

--- Comment #13 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
Author: kkojima
Date: Mon Feb 23 23:24:59 2015
New Revision: 220922

URL: https://gcc.gnu.org/viewcvs?rev"0922&root=gcc&view=rev
Log:
PR target/65153
[SH] Fix PR target/65153 with removing movsicc_true+3 peephole2.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/sh/sh-protos.h
    trunk/gcc/config/sh/sh.c
    trunk/gcc/config/sh/sh.md


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
  2015-02-23 23:04 ` [Bug middle-end/65182] " manu at gcc dot gnu.org
  2015-02-24  3:42 ` manu at gcc dot gnu.org
@ 2015-02-24  5:10 ` amodra at gcc dot gnu.org
  2015-02-24  6:37 ` amodra at gmail dot com
                   ` (2 subsequent siblings)
  5 siblings, 0 replies; 7+ messages in thread
From: amodra at gcc dot gnu.org @ 2015-02-24  5:10 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

--- Comment #3 from Alan Modra <amodra at gcc dot gnu.org> ---
Author: amodra
Date: Tue Feb 24 00:00:59 2015
New Revision: 220924

URL: https://gcc.gnu.org/viewcvs?rev=220924&root=gcc&view=rev
Log:
    PR target/65182
    * config/rs6000/rs6000.c (get_memref_parts): Only return true
    when *base is a reg.  Handle nested plus addresses.  Simplify
    pre_modify test.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.c


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
                   ` (2 preceding siblings ...)
  2015-02-24  5:10 ` amodra at gcc dot gnu.org
@ 2015-02-24  6:37 ` amodra at gmail dot com
  2021-03-31 16:29 ` [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function (fixed? add testcase?) msebor at gcc dot gnu.org
  2021-03-31 16:40 ` cvs-commit at gcc dot gnu.org
  5 siblings, 0 replies; 7+ messages in thread
From: amodra at gmail dot com @ 2015-02-24  6:37 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

Alan Modra <amodra at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amodra at gmail dot com

--- Comment #4 from Alan Modra <amodra at gmail dot com> ---
Apologies for the wrong pr reference in comment #3


^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function (fixed? add testcase?)
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
                   ` (3 preceding siblings ...)
  2015-02-24  6:37 ` amodra at gmail dot com
@ 2021-03-31 16:29 ` msebor at gcc dot gnu.org
  2021-03-31 16:40 ` cvs-commit at gcc dot gnu.org
  5 siblings, 0 replies; 7+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-03-31 16:29 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED
                 CC|                            |msebor at gcc dot gnu.org

--- Comment #7 from Martin Sebor <msebor at gcc dot gnu.org> ---
With -O0 both the test case in comment #0 and the one in comment #2 have been
diagnosed since sometime between r138836 and r138835 (GCC 4.4) so I'm not sure
how to explain that the bug is reported for Version 4.9.2.  (With -O1 both test
cases have been diagnosed as far back as GCC 4.1.)

Let me resolve this and add the test case.

^ permalink raw reply	[flat|nested] 7+ messages in thread
* [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function (fixed? add testcase?)
  2015-02-23 20:37 [Bug c/65182] New: -Wuninitialized fails when pointer to variable later passed to function tisaac at ices dot utexas.edu
                   ` (4 preceding siblings ...)
  2021-03-31 16:29 ` [Bug middle-end/65182] -Wuninitialized fails when pointer to variable later passed to function (fixed? add testcase?) msebor at gcc dot gnu.org
@ 2021-03-31 16:40 ` cvs-commit at gcc dot gnu.org
  5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-03-31 16:40 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65182

--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>:

https://gcc.gnu.org/g:31199d95de1304e200554bbf98b2d8a6a7298bec

commit r11-7932-g31199d95de1304e200554bbf98b2d8a6a7298bec
Author: Martin Sebor <msebor@redhat.com>
Date:   Wed Mar 31 10:39:24 2021 -0600

    PR middle-end/65182 - -Wuninitialized fails when pointer to variable later
passed to function

    gcc/testsuite:
            PR middle-end/65182
            * gcc.dg/uninit-pr65182.c: New test.

^ permalink raw reply	[flat|nested] 7+ messages in thread
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2015-02-23 23:04 ` [Bug middle-end/65182] " manu at gcc dot gnu.org
2015-02-24  3:42 ` manu at gcc dot gnu.org
2015-02-24  5:10 ` amodra at gcc dot gnu.org
2015-02-24  6:37 ` amodra at gmail dot com
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