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* [Bug c++/59292] New: Spurious warning: ‘<anonymous>’ is used uninitialized in this function
@ 2013-11-25 19:17 bluesmissionnaire at gmail dot com
2013-11-25 22:58 ` [Bug c++/59292] " manu at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: bluesmissionnaire at gmail dot com @ 2013-11-25 19:17 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59292
Bug ID: 59292
Summary: Spurious warning: ‘<anonymous>’ is used uninitialized
in this function
Product: gcc
Version: 4.4.7
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: bluesmissionnaire at gmail dot com
Created attachment 31290
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31290&action=edit
/usr/bin/g++-4.4 -Wall -Wextra -save-temps -c -O1
anonymous_may_be_used_uninitialized.cpp
Using g++-4.4 (GCC) 4.4.7 20120313 (Red Hat 4.4.7-1)
/usr/bin/g++-4.4 -Wall -Wextra -save-temps -c -O1
anonymous_may_be_used_uninitialized.cpp
warns:
anonymous_may_be_used_uninitialized.cpp: In function ‘typename T::value_type
gccBug::getFirstElement(const T&) [with T = std::map<gccBug::VectorSubclass,
gccBug::SomeTemplatedType<gccBug::SomeEnum, unsigned int>,
std::less<gccBug::VectorSubclass>, std::allocator<std::pair<const
gccBug::VectorSubclass, gccBug::SomeTemplatedType<gccBug::SomeEnum, unsigned
int> > > >]’:
anonymous_may_be_used_uninitialized.cpp:45: warning: ‘<anonymous>’ may be used
uninitialized in this function
anonymous_may_be_used_uninitialized.cpp:45: note: ‘<anonymous>’ was declared
here
When I decrease optimization level to 0 a warning disappears.
I checked test files attached to multiple similar bugs (including
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58877 which disappeared after
upgrade from 4.4.6 to 4.4.7) but none of them generated this warning. That is
why I am creating a new bug.
Using http://gcc.godbolt.org/ I confirmed that this bug still occurs on
Ubuntu/Linaro 4.4.7-1ubuntu2 and does not occur on newer versions so at least
the code attached my serve as an addition to your regression suite.
>From gcc-bugs-return-435817-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 19:18:01 2013
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From: "bluesmissionnaire at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59292] Spurious warning:=?UTF-8?Q? ‘?=<anonymous>=?UTF-8?Q?’ is used uninitialized in this function?Date: Mon, 25 Nov 2013 19:18:00 -0000
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--- Comment #1 from Przemysław Strzelczak <bluesmissionnaire at gmail dot com> ---
Created attachment 31291
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31291&action=edit
corresponding source file.
>From gcc-bugs-return-435818-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 19:57:22 2013
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Subject: [Bug c++/59113] [c++1y] ICE using auto as parameter in local function
Date: Mon, 25 Nov 2013 19:57:00 -0000
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Volker Reichelt <reichelt at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
Fixed by Adam's patch.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/59292] Spurious warning: ‘<anonymous>’ is used uninitialized in this function
2013-11-25 19:17 [Bug c++/59292] New: Spurious warning: ‘<anonymous>’ is used uninitialized in this function bluesmissionnaire at gmail dot com
@ 2013-11-25 22:58 ` manu at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: manu at gcc dot gnu.org @ 2013-11-25 22:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59292
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |manu at gcc dot gnu.org
Resolution|--- |WORKSFORME
--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Thanks for the report. However, this testcase is not very useful for the
regression testsuite. We need a minimal testcase:
http://gcc.gnu.org/bugs/minimize.html.
Since you say that the bug is not present in newer releases (4.4 is very old),
I think it is better to close this.
>From gcc-bugs-return-435842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 23:04:30 2013
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/59293] Bogus -Wsign-compare warning when using typeof() on a constant
Date: Mon, 25 Nov 2013 23:04:00 -0000
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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 #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
This would require CCP in the FE or moving these warnings to the middle-end,
which is something that no current developer thinks is a good idea.
Clang also warns here.
*** This bug has been marked as a duplicate of bug 38470 ***
>From gcc-bugs-return-435843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 23:04:32 2013
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Subject: [Bug c/38470] value range propagation (VRP) would improve -Wsign-compare
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |shawn at churchofgit dot com
--- Comment #12 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
*** Bug 59293 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-435844-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 23:33:36 2013
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From: "stefan.schwarzer at ipm dot fraunhofer.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59294] New: template friend declaration 'hidden' by member of same name
Date: Mon, 25 Nov 2013 23:33:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59294
Bug ID: 59294
Summary: template friend declaration 'hidden' by member of same
name
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: stefan.schwarzer at ipm dot fraunhofer.de
/* Dear experts,
I would like to use the same identifier for a member function and
a friend function of similar signature. Either declaring the friend
or the member works fine, but if both (#ifdef PROBLEM true) are present,
g++ starts yelling at me:
*/
template <class T> class Q;
template <class T>
const Q<T> conjugate(const Q<T> &);
template<class T>
struct Q {
#define PROBLEM
#ifdef PROBLEM
const Q conjugate() { return *this; }
#endif
friend const Q<T> conjugate<T>(const Q<T> &); // PROBLEM
// friend const Q conjugate<T>(const Q &); // -- equivalent
// friend const Q conjugate<>(const Q &); // -- equivalent
};
template <class T>
const Q<T> conjugate(const Q<T> &) { return Q<T>(); }
int main () {
Q<int> q;
#ifdef PROBLEM
q.conjugate();
#endif
conjugate(q);
return 0;
}
/*
$ g++ t.cc
t.cc:17:20: error: ‘conjugate’ is neither function nor member function; cannot
be declared friend
friend const Q<T> conjugate<T>(const Q<T> &);
^
t.cc:17:20: error: expected ‘;’ at end of member declaration
t.cc:17:29: error: expected unqualified-id before ‘<’ token
friend const Q<T> conjugate<T>(const Q<T> &);
Nothing I tried really helps:
- the existence or not of the forward declaration does not help
- my three feeble attempts of syntax variation (in comments) behave
equivalently
- using a qualified-id ::conjugate in the friend declaration only changes the
error message
Am I missing something basic or is this a compiler bug?
(debian testing)
$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.8.2-1'
--with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.8 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin
--with-system-zlib --disable-browser-plugin --enable-java-awt=gtk
--enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64/jre
--enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release
--build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.8.2 (Debian 4.8.2-1)
*/
>From gcc-bugs-return-435845-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 23:48:31 2013
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Subject: [Bug c++/58950] [4.9 Regression] Missing "statement has no effect"
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |manu at gcc dot gnu.org
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
You could decorate __builtin_shuffle with attribute "warn_unused_result". It is
not the same, but it probably more precise. It would also warn for:
__builtin_shuffle(x,++m), while -Wunused-value would not.
>From gcc-bugs-return-435846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Nov 25 23:49:09 2013
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Subject: [Bug fortran/59198] [4.7/4.8/4.9 Regression] ICE on cyclically dependent polymorphic types
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idY198
Tobias Burnus <burnus at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |burnus at gcc dot gnu.org
--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
(In reply to janus from comment #1)
> The ICE I get with trunk is: [...]
That's for the variable __decays_MOD___def_init_decays_Decay_t, which has the
fields decay_gen_t and rng. At the end, the problem is that t == NULL_TREE in
4933 fieldsize = tree_to_uhwi (DECL_SIZE_UNIT (local->field));
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2013-11-25 19:17 [Bug c++/59292] New: Spurious warning: ‘<anonymous>’ is used uninitialized in this function bluesmissionnaire at gmail dot com
2013-11-25 22:58 ` [Bug c++/59292] " manu at gcc dot gnu.org
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