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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65892] gcc fails to implement N685 aliasing of union members
Date: Mon, 23 Apr 2018 14:27:00 -0000 [thread overview]
Message-ID: <bug-65892-4-1FcgiR6bVd@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-65892-4@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65892
--- Comment #39 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Thu, 19 Apr 2018, jameskuyper at verizon dot net wrote:
> Code which relies upon this feature to implement a C-style approximation to
> inheritance has been fairly common, which is precisely why the C committee
> decided to create this rule, to make sure such code had well-defined behavior.
To make sure such code had well-defined behavior *notwithstanding the
adjacent rule (in C90) that access to a non-current union member was
otherwise implementation-defined*. Not overriding any other rule
elsewhere in the standard that might make such accesses undefined, such as
type-based aliasing, even though it's subsequently sometimes been
interpreted in connection with such rules (and access to a non-current
union member is now non-normatively specified in a footnote as type
punning).
>From gcc-bugs-return-602489-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 15:13:00 2018
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/85501] missed if-conversion / phiopt trick
Date: Mon, 23 Apr 2018 15:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85501
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
For scalar code or vector code? For the latter, it needs a gather load, which
is expensive...
>From gcc-bugs-return-602490-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 15:19:47 2018
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From: "abel at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/85423] [8 Regression] ICE in code_motion_process_successors, at sel-sched.c:6403
Date: Mon, 23 Apr 2018 15:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85423
--- Comment #5 from Andrey Belevantsev <abel at gcc dot gnu.org> ---
Author: abel
Date: Mon Apr 23 15:19:06 2018
New Revision: 259563
URL: https://gcc.gnu.org/viewcvs?rev=259563&root=gcc&view=rev
Log:
PR rtl-optimization/85423
* sel-sched-ir.c (has_dependence_note_mem_dep): Only discard
dependencies to debug insns when the previous insn is non-debug.
* gcc.dg/pr85423.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr85423.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/sel-sched-ir.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-602491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 15:37:13 2018
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From: "yangyibiao at nju dot edu.cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug gcov-profile/85201] [GCOV] A statement with two && operators and a comma operator in the for loop body is wrongly marked in gcov
Date: Mon, 23 Apr 2018 15:37:00 -0000
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--- Comment #2 from Yibiao Yang <yangyibiao at nju dot edu.cn> ---
@marxin Is this a real bug? or this bug is only default behavior?
>From gcc-bugs-return-602492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 15:44:56 2018
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From: "doko at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85503] New: [8 Regression] ICE in replace_swapped_load_constant, at config/rs6000/rs6000-p8swap.c:1853 on powerpc64le-linux-gnu
Date: Mon, 23 Apr 2018 15:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85503
Bug ID: 85503
Summary: [8 Regression] ICE in replace_swapped_load_constant,
at config/rs6000/rs6000-p8swap.c:1853 on
powerpc64le-linux-gnu
Product: gcc
Version: 8.0
Status: UNCONFIRMED
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Reporter: doko at gcc dot gnu.org
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Created attachment 44007
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44007&action=edit
preprocessed source
seen with r259383 on the trunk, powerpc64le-linux-gnu, worked around with -O2:
$ g++ -Wall -std=gnu++11 -c -O2 gasgraphics.ii
during RTL pass: swaps
: In function �int GasGraphicsItemcreateOnHoverHandler()�:
:211:1: internal compiler error: in replace_swapped_load_constant, at
config/rs6000/rs6000-p8swap.c:1853
Please submit a full bug report,
with preprocessed source if appropriate.
gcc configured with
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/powerpc64le-linux-gnu-as
--with-ld=/usr/bin/powerpc64le-linux-gnu-ld --program-suffix=-8
--program-prefix=powerpc64le-linux-gnu- --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object --enable-plugin
--enable-default-pie --with-system-zlib --disable-libphobos
--enable-objc-gc=auto --enable-secureplt --with-cpu=power8
--enable-targets=powerpcle-linux --disable-multilib --enable-multiarch
--disable-werror --with-long-double-128 --enable-checking=release
--build=powerpc64le-linux-gnu --host=powerpc64le-linux-gnu
--target=powerpc64le-linux-gnu
>From gcc-bugs-return-602493-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 15:48:48 2018
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From: "doko at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/85503] [8 Regression] ICE in replace_swapped_load_constant, at config/rs6000/rs6000-p8swap.c:1853 on powerpc64le-linux-gnu
Date: Mon, 23 Apr 2018 15:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85503
--- Comment #1 from Matthias Klose <doko at gcc dot gnu.org> ---
$ cat gasgraphics.ii
# 3 "" 3
namespace b {
template < int c > struct d { static constexpr int e = c; };
typedef d< false > f;
template < typename g > struct h { typedef g i; };
template < typename > class j;
template < bool, bool, typename... > struct aa;
struct k {
template < typename n, typename... q >
static h< decltype(n()(q()...)) > o(int);
};
template < typename p, typename... t > struct aa< false, false, p, t... > : k {
typedef decltype(o< p, t... >(0)) i;
};
template < typename p, typename... t >
struct ab : aa< f::e, f::e, p, t... >::i {};
template < typename p, typename... t > struct j< p(t...) > : ab< p, t... > {};
} enum { r, s };
typedef long x;
template < typename > struct ac;
template < typename y > struct ac< y & > { typedef y i; };
template < typename y > struct j { typedef typename b::j< y >::i i; };
template < typename > struct ad;
template < typename > struct ae;
template < typename > class af;
template < typename, int ag, int ah, int = 0, int = ag, int = ah > class ai;
template < typename > class aj;
template < typename, typename, typename > class ak;
template < typename > class al;
template < typename > struct am;
template < typename > struct an;
template < typename y > struct ao { typedef typename am< y >::i i; };
struct aq {
typedef const ai< double, 2, 1 > &ar;
};
template < typename as > struct at { typedef aj< as > i; };
template < typename as > struct au { typedef typename at< as >::i i; };
template < typename av > av aw(const typename an< av >::i *);
template < typename av, int > av az(const typename an< av >::i *ba) {
return aw< av >(ba);
}
typedef __attribute__((altivec(vector__))) double bb;
template <> struct am< double > { typedef bb i; };
template <> struct an< bb > { typedef double i; };
template <> bb aw(const double *ba) { return __builtin_vec_vsx_ld(0, ba); }
struct bc {
template < typename av > bd(av a) { bd(a); }
};
struct be {
double operator()(const, const);
};
template < typename as > class bf : public ae< as > {
public:
typedef typename ad< as >::bg bg;
ae< as >::bh;
enum { bi };
bg bj() const;
template < typename bk > bg bl(const bk &) const;
};
template < typename as > class aj : public bf< as > {
public:
bf< as >::bh;
template < typename bm > ak< be, const as, const bm > operator-(bm bn) {
return ak< be, const as, const bm >(bh(), bn);
}
bo() const;
al< as > array() { return bh(); }
};
template < typename as > struct ae {
const as &bh() const { return *static_cast< const as * >(this); }
};
template < typename > struct bp;
template < typename > struct bq;
template < typename y > struct br : bq< y > {
br(y bs) : bq< y >(bs) {}
};
template < typename y > struct br< const y > : br< y > {
br(const y &bs) : br< y >(bs) {}
};
template < typename as > struct br< af< as > > {
typedef as bt;
br(const bt &m) : bu(m.bv()) {}
template < int bw, typename ay > ay bx(x, x by) {
return az< ay, bw >(bu + by);
}
const typename bt::bg *bu;
};
template < typename bg, int u, int bz, int ca, int cb, int cc >
struct br< ai< bg, u, bz, ca, cb, cc > > : br< af< ai< bg, u, bz > > > {
typedef ai< bg, u, bz > cd;
br(const cd &m) : br< af< cd > >(m) {}
};
template < typename bk, typename ce, typename cf >
struct br< ak< bk, ce, cf > > : bp< ak< bk, ce, cf > > {
br(ak< bk, ce, cf > bs) : bp< ak< bk, ce, cf > >(bs) {}
};
template < typename bk, typename ce, typename cf >
struct bp< ak< bk, ce, cf > > {
bp(ak< bk, ce, cf > bs) : cg(), ch(bs.ci()) {}
template < int bw, typename ay > ay bx(x cj, x by) {
return ch.template bx< bw, ay >(cj, by);
}
ce cg;
br< cf > ch;
};
template < typename cd > struct v {
typedef typename ac< typename cd::ck >::i cl;
v(cl &arg) : cn(arg) {}
template < int bw, typename ay > ay bx(x cj, x by) {
return cn.template bx< bw, ay >(cj, by);
}
br< cl > cn;
};
template < typename cm > struct bq< al< cm > > : v< al< cm > > {
bq(al< cm > w) : v< al< cm > >(w.dd()) {}
};
template < typename as > class ap : public bf< as > {};
template < int ax > struct co { double array[ax]; };
template < int ax > class cq {
co< ax > bu;
public:
const double *bv() const { return bu.array; }
};
template < typename as > class af : public at< as >::i {
public:
typedef typename at< as >::i cp;
cq< cp::bi > cs;
const typename ad< as >::bg *bv() const { return cs.bv(); }
};
template < typename cr, int ag, int ah, int cu, int ct, int cw >
struct ad< ai< cr, ag, ah, cu, ct, cw > > {
typedef cr bg;
};
template < typename, int ag, int ah, int, int, int >
class ai : public af< ai< double, ag, ah > > {
typedef ai cv;
};
template < typename bk, typename ce, typename cf >
struct ad< ak< bk, ce, cf > > {
typedef typename j< bk(typename ce::bg, typename cf::bg) >::i bg;
};
template < typename, typename, typename > class z;
template < typename bk, typename cy, typename cx >
class ak : public z< bk, cy, cx > {
public:
typedef cx RhsNested;
ak(cy, cx cz) : da(), db(cz) {}
RhsNested ci() { return db; }
cy da;
RhsNested db;
};
template < typename bk, typename ce, typename cf >
class z : public au< ak< bk, ce, cf > >::i {};
template < typename as > aj< as >::bo() const { (*this).bj(); }
template < typename as > struct dc {
typedef typename ao< typename as::bg >::i ay;
enum { d, de };
enum { df = de };
};
template < typename as > struct dk {
enum { dh, di, dj, alignment };
typedef typename dc< as >::ay PacketScalar;
static PacketScalar dl(as dm, bc) {
return dm.template dn< alignment, PacketScalar >(di, dj);
}
};
template < typename, typename as, int = dc< as >::df > struct redux_impl;
template < typename Func, typename as > struct redux_impl< Func, as, s > {
static dl(as dm, Func func) { func.bd(dk< as >::dl(dm, func)); }
};
template < typename _XprType > class redux_evaluator {
public:
typedef _XprType cd;
redux_evaluator(cd bs) : m_evaluator(bs), m_xpr(bs) {}
typedef typename cd::bg bg;
template < int bw, typename ay > ay dn(x di, x dj) {
return m_evaluator.template bx< bw, ay >(dj, di);
}
br< cd > m_evaluator;
cd m_xpr;
};
template < typename as >
template < typename Func >
typename ad< as >::bg bf< as >::bl(const Func &func) const {
typedef redux_evaluator< as > ThisEvaluator;
ThisEvaluator thisEval(bh());
redux_impl< Func, ThisEvaluator >::dl(thisEval, func);
}
template < typename as > typename ad< as >::bg bf< as >::bj() const {
bl(bc());
}
template < typename ExpressionType >
struct ad< al< ExpressionType > > : ad< typename ExpressionType::cv > {};
template < typename > class al : public ap< al< ai< double, 2, 1 > > > {
public:
typedef aq::ar ck;
al(const ai< double, 2, 1 > &dg) : m_expression(dg) {}
const ai< double, 2, 1 > &dd() { return m_expression; }
ck m_expression;
};
typedef ai< double, 2, 1 > Vector2d;
class OnHoverHandlerGraphicsItem {
public:
static Vector2d corners;
};
GasGraphicsItemcreateOnHoverHandler() {
Vector2d l;
(l - OnHoverHandlerGraphicsItem::corners.array()).bo();
}
>From gcc-bugs-return-602494-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 17:35:04 2018
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/85503] [8 Regression] ICE in replace_swapped_load_constant, at config/rs6000/rs6000-p8swap.c:1853 on powerpc64le-linux-gnu
Date: Mon, 23 Apr 2018 17:35:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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Subject: [Bug c++/85470] [7/8 Regression] Strange error about "call to non-constexpr function"
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Jason Merrill <jason at gcc dot gnu.org> changed:
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Subject: [Bug target/85503] [8 Regression] ICE in replace_swapped_load_constant, at config/rs6000/rs6000-p8swap.c:1853 on powerpc64le-linux-gnu
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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>From gcc-bugs-return-602497-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 23 18:52:37 2018
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From: "bernd.edlinger at hotmail dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/85504] New: Bogus -Wrestrict warning with -fsanitize=undefined
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85504
Bug ID: 85504
Summary: Bogus -Wrestrict warning with -fsanitize=undefined
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
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Created attachment 44008
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44008&action=edit
unreduced test case
This happens with current openssl trunk revision:
./config -fsanitize=undefined --strict-warnings
$ gcc -I. -Icrypto/include -Iinclude -fPIC -pthread -m64 -Wa,--noexecstack
-DDEBUG_UNUSED -DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra
-Wno-unused-parameter -Wno-missing-field-initializers -Wswitch -Wsign-compare
-Wmissing-prototypes -Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3
-fsanitize=undefined -DOPENSSL_USE_NODELETE -DL_ENDIAN -DOPENSSL_PIC
-DOPENSSL_CPUID_OBJ -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT
-DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM
-DSHA512_ASM -DRC4_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DGHASH_ASM
-DECP_NISTZ256_ASM -DX25519_ASM -DPADLOCK_ASM -DPOLY1305_ASM
-DOPENSSLDIR="\"/usr/local/ssl\"" -DENGINESDIR="\"/usr/local/lib/engines-1.1\""
-DNDEBUG -MMD -MF crypto/engine/eng_ctrl.d.tmp -MT crypto/engine/eng_ctrl.o -c
-o crypto/engine/eng_ctrl.o crypto/engine/eng_ctrl.c
crypto/engine/eng_ctrl.c: In function 'ENGINE_ctrl':
crypto/engine/eng_ctrl.c:110:23: error: 'strcpy' source argument is the same as
destination [-Werror=restrict]
return strlen(strcpy(s, cdp->cmd_name));
^~~~~~~~~~~~~~~~~~~~~~~~
while I can use -save-temps with this one (see attached test case)
there is another file which does not show the error with -save-temps:
$ gcc -I. -Iinclude -Iapps -pthread -m64 -Wa,--noexecstack -DDEBUG_UNUSED
-DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -Wswitch -Wsign-compare -Wmissing-prototypes
-Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3 -fsanitize=undefined
-DNDEBUG -MMD -MF apps/s_client.d.tmp -MT apps/s_client.o -c -o
apps/s_client.o apps/s_client.c
In file included from /usr/include/string.h:635,
from apps/s_client.c:15:
apps/s_client.c: In function 's_client_main':
apps/s_client.c:2585:13: error: '__builtin_strncpy' source argument is the same
as destination [-Werror=restrict]
strncpy(sbuf, mbuf, 2);
^~~~~~~
$ gcc -I. -Iinclude -Iapps -pthread -m64 -Wa,--noexecstack -DDEBUG_UNUSED
-DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -Wswitch -Wsign-compare -Wmissing-prototypes
-Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3 -fsanitize=undefined
-DNDEBUG -MMD -MF apps/s_client.d.tmp -MT apps/s_client.o -c -o
apps/s_client.o apps/s_client.c -save-temps
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Subject: Re: bug ? : -Wpedantic -Wconversion 'short a=1; a-=1;' complaint
To: Jason Vas Dias <jason.vas.dias@gmail.com>, gcc-bugs@gcc.gnu.org
References: <o9iac8sg.fsf@gmail.com>
From: Jim Wilson <jimw@sifive.com>
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Date: Mon, 23 Apr 2018 19:04:00 -0000
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On 04/23/2018 07:11 AM, Jason Vas Dias wrote:
>
> I really do not think a '-Wpedantic -Wconversion' warning should
> be generated for the following code, but it is
> (with GCC 6.4.1 and 7.3.1 on RHEL-7.5 Linux) :
>
> $ echo '
> typedef unsigned short U16_t;
> static void f(void)
> { U16_t a = 1;
> a-=1;
> }' > t.C;
gcc@gcc.gnu.org dropped as inappropriate. Note that gcc-bugs is output
from our bugzilla. Sending email here isn't very useful. If you want a
bug fixed, you have to open a bug report in bugzilla. You can ask gcc
questions on gcc help.
In the C language, operations on short and always performed as int, and
then converted back to short. Subtracting one may generated a negative
number, which converted to unsigned short will change its value. So the
warning seems appropriate.
Note that -Wconversion means different things in different gcc versions.
It current meaning is to warn for any implicit cast that may change a
value. This is not very useful in general, and is not an option that I
would recommend using by default. In old gcc versions, -Wconversion
warned for code that had different meaning in K&R C and ISO C. That was
useful, and some people used that option by default, but the option no
longer does that.
You can silence the warning by adding an explicit cast.
a = (U16_t) (a - 1);
Jim
prev parent reply other threads:[~2018-04-23 14:27 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-25 23:59 [Bug c/65892] New: " msebor at gcc dot gnu.org
2015-04-26 0:11 ` [Bug c/65892] " pinskia at gcc dot gnu.org
2015-04-26 0:15 ` pinskia at gcc dot gnu.org
2015-04-26 0:17 ` pinskia at gcc dot gnu.org
2015-04-26 17:50 ` pinskia at gcc dot gnu.org
2015-04-26 18:00 ` msebor at gcc dot gnu.org
2015-04-27 9:00 ` rguenth at gcc dot gnu.org
2015-04-27 14:57 ` msebor at gcc dot gnu.org
2015-04-28 17:08 ` joseph at codesourcery dot com
2015-05-13 16:02 ` msebor at gcc dot gnu.org
2015-05-21 11:41 ` mpolacek at gcc dot gnu.org
2015-09-09 0:39 ` myriachan at gmail dot com
2015-09-09 0:43 ` myriachan at gmail dot com
2015-09-09 13:44 ` joseph at codesourcery dot com
2015-09-09 14:25 ` redi at gcc dot gnu.org
2015-09-09 14:42 ` redi at gcc dot gnu.org
2015-09-09 15:59 ` msebor at gcc dot gnu.org
2018-04-23 14:27 ` joseph at codesourcery dot com [this message]
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