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* [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included)
@ 2014-07-02 22:24 josh at joshtriplett dot org
2014-07-03 6:51 ` [Bug middle-end/61677] " schwab@linux-m68k.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: josh at joshtriplett dot org @ 2014-07-02 22:24 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
Bug ID: 61677
Summary: False positive with -Wmaybe-uninitialized (test case
included)
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: josh at joshtriplett dot org
Created attachment 33055
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33055&action=edit
Test case for false positive in -Wmaybe-uninitialized
With the attached file bug.i:
$ gcc -Wall -O2 -c bug.i -o /dev/null
In file included from scripts/kconfig/zconf.tab.c:2537:0:
scripts/kconfig/menu.c: In function âget_symbol_strâ:
scripts/kconfig/menu.c:590:18: warning: âjumpâ may be used uninitialized in
this function [-Wmaybe-uninitialized]
In file included from scripts/kconfig/zconf.tab.c:2537:0:
scripts/kconfig/menu.c:551:19: note: âjumpâ was declared here
The warning occurs in get_prompt_str, which initializes jump if (head &&
location), and subsequently uses jump if (head && location && ...).
gcc --version says "gcc (Debian 4.9.0-9) 4.9.0"
>From gcc-bugs-return-455535-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 02 22:32:31 2014
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From: "larsbj at gullik dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/61678] New: internal compiler error: in expand_expr_real_1, at expr.c:9467
Date: Wed, 02 Jul 2014 22:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61678
Bug ID: 61678
Summary: internal compiler error: in expand_expr_real_1, at
expr.c:9467
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: larsbj at gullik dot net
$ cat main.ii
struct Test {
Test();
};
Test::Test()
{
int w = 512;
unsigned rgb_ref[1][w];
}
Gives this error:
$ /opt/gcc/gcc-trunk/bin/g++ -c main.ii
main.ii: In constructor âTest::Test()â:
main.ii:8:26: internal compiler error: in expand_expr_real_1, at expr.c:9467
unsigned rgb_ref[1][w];
^
0x77961b expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
../../gcc/gcc/expr.c:9462
0x7825e5 expand_expr
../../gcc/gcc/expr.h:451
0x7825e5 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
../../gcc/gcc/expr.c:8151
0x6c542e expand_gimple_stmt_1
../../gcc/gcc/cfgexpand.c:3294
0x6c542e expand_gimple_stmt
../../gcc/gcc/cfgexpand.c:3354
0x6c656a expand_gimple_basic_block
../../gcc/gcc/cfgexpand.c:5192
0x6c8166 execute
../../gcc/gcc/cfgexpand.c:5799
This is with $ /opt/gcc/gcc-trunk/bin/g++ --version
g++ (GCC) 4.10.0 20140702 (experimental)
>From gcc-bugs-return-455536-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 02 23:00:38 2014
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From: "gary at intrepid dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/61679] New: build fails with G++ 4.5.1 - prototype for hash_table does not match any in class
Date: Wed, 02 Jul 2014 23:00:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61679
Bug ID: 61679
Summary: build fails with G++ 4.5.1 - prototype for hash_table
does not match any in class
Product: gcc
Version: 4.10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: gary at intrepid dot com
This build failure shows up on a recent source version of GCC 4.10 (212138
2014-06-30). An attempt to bootstrap the compiler on an older system with GCC
4.5.1 installed fails as follows:
/a/gcc-4.5.1/bld/rls/bin/g++ -c -DIN_GCC_FRONTEND -DIN_GCC_FRONTEND
-DIN_GCC_FRONTEND -O0 -g3 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wwrite-strings -Wcast-qual
-Wmissing-format-attribute -Woverloaded-virtual -pedantic -Wno-long-long
-Wno-variadic-macros -Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I.
-I. -I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc
-I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/.
-I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/../include
-I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/../libcpp/include
-I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/../libdecnumber
-I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/../libdecnumber/bid
-I../libdecnumber -I/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/../libbacktrace
-o attribs.o -MT attribs.o -MMD -MP -MF ./.deps/attribs.TPo
/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/attribs.c
In file included from /eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/attribs.c:35:0:
/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/hash-table.h:667:1: error: prototype
for âtypename Descriptor::value_type** hash_table<Descriptor, Allocator,
false>::find_empty_slot_for_expand(hashval_t)â does not match any in class
âhash_table<Descriptor, Allocator, false>â
/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/hash-table.h:606:16: error: candidate
is: hash_table<Descriptor, Allocator, false>::value_type**
hash_table<Descriptor, Allocator, false>::find_empty_slot_for_expand(hashval_t)
/eng/upc/dev/gary/gupc-gcc-trunk/src/gcc/hash-table.h:807:1: error: prototype
for âtypename Descriptor::value_type* hash_table<Descriptor, Allocator,
false>::find_with_hash(hash_table<Descriptor, Allocator, false>::compare_type*,
hashval_t)â does not match any in class âhash_table<Descriptor, Allocator,
false>â
[...]
>From gcc-bugs-return-455537-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Jul 02 23:24:42 2014
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From: "longb at cray dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/61680] New: vectorization gives wrong answer for sandybridge target
Date: Wed, 02 Jul 2014 23:24:00 -0000
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Bug ID: 61680
Summary: vectorization gives wrong answer for sandybridge
target
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: longb at cray dot com
Created attachment 33056
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id3056&actioníit
test3.f90
Bad result:
> gfortran -march=corei7-avx -O3 test3.f90
> ./a.out
10.000000000000000
Good result:
> gfortran -march=corei7-avx -O3 -fno-tree-vectorize test3.f90
> ./a.out
13.114877048604001
>
Version info:
> gfortran --version
GNU Fortran (GCC) 4.9.0 20140422 (Cray Inc.)
Copyright (C) 2014 Free Software Foundation, Inc.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (test case included)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
@ 2014-07-03 6:51 ` schwab@linux-m68k.org
2014-07-03 15:17 ` manu at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: schwab@linux-m68k.org @ 2014-07-03 6:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
That's why it's called -W*maybe*-uninitialized, false positives are expected.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (test case included)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
2014-07-03 6:51 ` [Bug middle-end/61677] " schwab@linux-m68k.org
@ 2014-07-03 15:17 ` manu at gcc dot gnu.org
2014-07-03 15:26 ` manu at gcc dot gnu.org
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: manu at gcc dot gnu.org @ 2014-07-03 15:17 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2014-07-03
CC| |manu at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
This testcase needs minimizing: https://gcc.gnu.org/bugs/minimize.html
The uninit pass reports:
[BEFORE SIMPLICATION -- [USE]:
jump_227->offset = _110;
is guarded by :
_181 != 0
[BEFORE NORMALIZATION --[USE]:
jump_227->offset = _110;
is guarded by :
_181 != 0
[AFTER NORMALIZATION -- [USE]:
jump_227->offset = _110;
is guarded by :
_226 != 0 (.AND.) menu_108 == location_229
[BEFORE SIMPLICATION -- [DEF]:
jump_227 = PHI <jump_111(29), jump_127(D)(69)>
is guarded by :
location_92 != &rootmenu (.AND.) (.NOT.) ivtmp.1338_129 != 8 (.AND.) _176 != 0
(.OR.)
(.NOT.) location_92 != &rootmenu (.AND.) _95 != 0
[BEFORE NORMALIZATION --[DEF]:
jump_227 = PHI <jump_111(29), jump_127(D)(69)>
is guarded by :
location_92 != &rootmenu (.AND.) (.NOT.) ivtmp.1338_129 != 8 (.AND.) _176 != 0
(.OR.)
(.NOT.) location_92 != &rootmenu (.AND.) _95 != 0
[AFTER NORMALIZATION -- [DEF]:
jump_227 = PHI <jump_111(29), jump_127(D)(69)>
is guarded by :
head_36(D) != 0B (.AND.) location_89 != 0B (.AND.) (.NOT.) ivtmp.1338_129 != 8
(.AND.) location_92 != &rootmenu
(.OR.)
head_36(D) != 0B (.AND.) location_130 != 0B (.AND.) (.NOT.) location_92 !=
&rootmenu
[CHECK]: Found unguarded use: jump_227->offset = _110;
which does not clarify much what is going on.
>From gcc-bugs-return-455582-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jul 03 15:18:01 2014
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/61688] [4.10 Regression] ICE: tree check: expected record_type or union_type or qual_union_type, have array_type in ipa_binfo_from_known_type_jfunc
Date: Thu, 03 Jul 2014 15:18:00 -0000
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Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mjambor at suse dot cz
--- Comment #2 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Started with r198088.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (test case included)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
2014-07-03 6:51 ` [Bug middle-end/61677] " schwab@linux-m68k.org
2014-07-03 15:17 ` manu at gcc dot gnu.org
@ 2014-07-03 15:26 ` manu at gcc dot gnu.org
2021-03-29 21:23 ` [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP) cvs-commit at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: manu at gcc dot gnu.org @ 2014-07-03 15:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Perhaps related to PR61409 or PR56574.
>From gcc-bugs-return-455584-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jul 03 15:34:07 2014
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From: "wmichaelv at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/61689] Assignment and Operator not working as intended.
Date: Thu, 03 Jul 2014 15:34:00 -0000
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--- Comment #2 from wmichaelv at hotmail dot com ---
(In reply to Marek Polacek from comment #1)
> The program has undefined behaviour; an assignment is not a sequence point.
> See what -Wsequence-point says.
According to the order operation, grouping should be calculated first before
add, subtract, division, and multiplication, and assignment. And the
associativity of assignment is from right to left.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
` (2 preceding siblings ...)
2014-07-03 15:26 ` manu at gcc dot gnu.org
@ 2021-03-29 21:23 ` cvs-commit at gcc dot gnu.org
2021-03-29 21:29 ` msebor at gcc dot gnu.org
2022-08-29 14:26 ` [Bug tree-optimization/61677] " rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-03-29 21:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
--- Comment #7 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:fecc835e216f537d3e7edb833cb3769489b983bb
commit r11-7898-gfecc835e216f537d3e7edb833cb3769489b983bb
Author: Martin Sebor <msebor@redhat.com>
Date: Mon Mar 29 15:21:32 2021 -0600
PR tree-optimization/61677 - False positive with -Wmaybe-uninitialized
gcc/testsuite/ChangeLog:
PR tree-optimization/61677
* gcc.dg/uninit-pr61677.c: New test.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
` (3 preceding siblings ...)
2021-03-29 21:23 ` [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP) cvs-commit at gcc dot gnu.org
@ 2021-03-29 21:29 ` msebor at gcc dot gnu.org
2022-08-29 14:26 ` [Bug tree-optimization/61677] " rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: msebor at gcc dot gnu.org @ 2021-03-29 21:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
The false positive for the reduced test case from comment #4 was fixed by
r220696. r11-7898 adds it to the testsuite. The unreduced test case from
attachment 33055 still warns with GCC 11:
$ gcc -O2 -S -Wall pr61677-c0.c
In file included from scripts/kconfig/zconf.tab.c:2537:
scripts/kconfig/menu.c: In function ‘get_symbol_str’:
scripts/kconfig/menu.c:590:18: warning: ‘jump’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
In file included from scripts/kconfig/zconf.tab.c:2537:
scripts/kconfig/menu.c:551:19: note: ‘jump’ was declared here
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP)
2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
` (4 preceding siblings ...)
2021-03-29 21:29 ` msebor at gcc dot gnu.org
@ 2022-08-29 14:26 ` rguenth at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-08-29 14:26 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61677
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to fail| |13.0
Last reconfirmed|2014-07-03 00:00:00 |2022-8-29
Keywords| |needs-reduction
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Reconfirmed with the original testcase.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2014-07-02 22:24 [Bug c/61677] New: False positive with -Wmaybe-uninitialized (test case included) josh at joshtriplett dot org
2014-07-03 6:51 ` [Bug middle-end/61677] " schwab@linux-m68k.org
2014-07-03 15:17 ` manu at gcc dot gnu.org
2014-07-03 15:26 ` manu at gcc dot gnu.org
2021-03-29 21:23 ` [Bug middle-end/61677] False positive with -Wmaybe-uninitialized (predicate analysis, VRP) cvs-commit at gcc dot gnu.org
2021-03-29 21:29 ` msebor at gcc dot gnu.org
2022-08-29 14:26 ` [Bug tree-optimization/61677] " rguenth at gcc dot gnu.org
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