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* [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
@ 2015-06-07 20:13 dimhen at gmail dot com
2015-06-08 8:18 ` [Bug sanitizer/66452] " mpolacek at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: dimhen at gmail dot com @ 2015-06-07 20:13 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
Bug ID: 66452
Summary: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not
used
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: dimhen at gmail dot com
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
Target Milestone: ---
r224060 PASS
r224193 FAIL
$ g++ -Wall -O0 -fsanitize=undefined -c x.ii -fpreprocessed -o x.o
x.ii: In member function 'A B::m_fn1() const':
x.ii:9:12: warning: unused variable 'i' [-Wunused-variable]
for (int i;;)
^
At global scope:
cc1plus: warning: '*.Lubsan_data0' defined but not used [-Wunused-variable]
$ cat x.ii
class A {
public:
A(int);
};
class B {
A m_fn1() const;
};
A B::m_fn1() const {
for (int i;;)
;
return 0;
}
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/gcc_current/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_current/configure
--prefix=/usr/local/gcc_current --enable-static
--enable-checking=yes,df,fold,rtl --enable-languages=c,c++,lto --enable-plugin
--disable-libstdcxx-dual-abi --disable-multilib
Thread model: posix
gcc version 6.0.0 20150606 (experimental) [trunk revision 224193] (GCC)
$ ~/bin/gcc_224060_rls/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/dimhen/bin/gcc_224060_rls/bin/g++
COLLECT_LTO_WRAPPER=/home/dimhen/bin/gcc_224060_rls/bin/../libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_r224060/configure
--prefix=/usr/local/gcc_current --enable-static --enable-checking=release
--enable-languages=c,c++,lto --enable-plugin --disable-libstdcxx-dual-abi
--disable-multilib
Thread model: posix
gcc version 6.0.0 20150603 (experimental) [trunk revision 224060] (GCC)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
@ 2015-06-08 8:18 ` mpolacek at gcc dot gnu.org
2015-06-08 8:34 ` mpolacek at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-06-08 8:18 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2015-06-08
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |6.0
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
2015-06-08 8:18 ` [Bug sanitizer/66452] " mpolacek at gcc dot gnu.org
@ 2015-06-08 8:34 ` mpolacek at gcc dot gnu.org
2015-06-08 8:36 ` dimhen at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-06-08 8:34 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r224161 aka debug-early branch merge.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
2015-06-08 8:18 ` [Bug sanitizer/66452] " mpolacek at gcc dot gnu.org
2015-06-08 8:34 ` mpolacek at gcc dot gnu.org
@ 2015-06-08 8:36 ` dimhen at gmail dot com
2015-06-08 8:45 ` mpolacek at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: dimhen at gmail dot com @ 2015-06-08 8:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
--- Comment #3 from Dmitry G. Dyachenko <dimhen at gmail dot com> ---
r224136 PASS
r224161 FAIL (stage1 compiler due broken bootstrap)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
` (2 preceding siblings ...)
2015-06-08 8:36 ` dimhen at gmail dot com
@ 2015-06-08 8:45 ` mpolacek at gcc dot gnu.org
2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-06-08 8:45 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I'm testing
--- a/gcc/toplev.c
+++ b/gcc/toplev.c
@@ -534,6 +534,7 @@ check_global_declaration (tree decl)
to handle multiple external decls in different scopes. */
&& ! (DECL_NAME (decl) && TREE_USED (DECL_NAME (decl)))
&& ! DECL_EXTERNAL (decl)
+ && ! DECL_ARTIFICIAL (decl)
&& ! TREE_PUBLIC (decl)
/* A volatile variable might be used in some non-obvious way. */
&& ! TREE_THIS_VOLATILE (decl)
(Maybe we should also test !TREE_NO_WARNING but the above is enough to fix
this.)
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
` (4 preceding siblings ...)
2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
@ 2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-06-08 10:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
--- Comment #5 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Jun 8 10:35:24 2015
New Revision: 224216
URL: https://gcc.gnu.org/viewcvs?rev=224216&root=gcc&view=rev
Log:
PR sanitizer/66452
* toplev.c (check_global_declaration): Don't warn about artificial
decls.
* g++.dg/ubsan/pr66452.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ubsan/pr66452.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/toplev.c
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug sanitizer/66452] [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
` (3 preceding siblings ...)
2015-06-08 8:45 ` mpolacek at gcc dot gnu.org
@ 2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-06-08 10:36 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2015-06-07 20:13 [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used dimhen at gmail dot com
2015-06-08 8:18 ` [Bug sanitizer/66452] " mpolacek at gcc dot gnu.org
2015-06-08 8:34 ` mpolacek at gcc dot gnu.org
2015-06-08 8:36 ` dimhen at gmail dot com
2015-06-08 8:45 ` mpolacek at gcc dot gnu.org
2015-06-08 10:36 ` mpolacek at gcc dot gnu.org
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