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* [Bug c++/61488] New: Regression in template argument substitution in 4.9+
@ 2014-06-12 16:21 roland at digitalvampire dot org
2014-06-13 19:01 ` [Bug c++/61488] " jason at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: roland at digitalvampire dot org @ 2014-06-12 16:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61488
Bug ID: 61488
Summary: Regression in template argument substitution in 4.9+
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: roland at digitalvampire dot org
The following code compiles fine with gcc 4.8 (and clang 3.4 for giggles).
With gcc 4.9 I get the error shown; Debian's gcc-snapshot version of 4.10
behaves the same way.
The non-template member function fix() is accepted by all compilers, but 4.9
rejects the template member function repair(). I don't know of any C++
language reason why the body of repair() should be treated differently.
~$ cat a.cpp
struct A {
typedef int (A::*cont_func)();
template <A::cont_func> void wait(int);
int notify();
void fix() { wait<&A::notify>(0); } // OK
template <int> void repair() { wait<&A::notify>(0); }
};
~$ for CC in gcc-4.8 clang gcc-4.9; do echo "=== $CC ("`$CC --version`")" ===;
$CC -Wall -Werror -c a.cpp && echo SUCCESS; echo; done ; gcc-4.9 -v -c a.cpp
=== gcc-4.8 (gcc-4.8 (Debian 4.8.3-2) 4.8.3 Copyright (C) 2013 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.) ===
SUCCESS
=== clang (Debian clang version 3.4.1-4 (tags/RELEASE_34/dot1-final) (based on
LLVM 3.4.1) Target: x86_64-pc-linux-gnu Thread model: posix) ===
SUCCESS
=== gcc-4.9 (gcc-4.9 (Debian 4.9.0-5) 4.9.0 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.) ===
a.cpp: In member function ‘void A::repair()’:
a.cpp:7:58: error: no matching function for call to ‘A::wait(int)’
template <int> void repair() { wait<&A::notify>(0); }
^
a.cpp:7:58: note: candidate is:
a.cpp:3:38: note: template<int (A::* <anonymous>)()> void A::wait(int)
template <A::cont_func> void wait(int);
^
a.cpp:3:38: note: template argument deduction/substitution failed:
a.cpp:7:58: error: ‘&((A*)this)->*A::notify’ is not a valid template argument
for type ‘int (A::*)()’
template <int> void repair() { wait<&A::notify>(0); }
^
a.cpp:7:58: error: it must be a pointer-to-member of the form ‘&X::Y’
a.cpp:7:58: error: could not convert template argument
‘&((A*)this)->*A::notify’ to ‘int (A::*)()’
Using built-in specs.
COLLECT_GCC=gcc-4.9
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.0-5'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap
--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-4.9-amd64/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.9-amd64
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-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 --enable-multilib --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 4.9.0 (Debian 4.9.0-5)
COLLECT_GCC_OPTIONS='-v' '-c' '-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/4.9/cc1plus -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE a.cpp -quiet -dumpbase a.cpp -mtune=generic
-march=x86-64 -auxbase a -version -o /tmp/ccBdykTy.s
GNU C++ (Debian 4.9.0-5) version 4.9.0 (x86_64-linux-gnu)
compiled by GNU C version 4.9.0, GMP version 6.0.0, MPFR version 3.1.2-p3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/4.9"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.9
/usr/include/x86_64-linux-gnu/c++/4.9
/usr/include/c++/4.9/backward
/usr/lib/gcc/x86_64-linux-gnu/4.9/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/4.9/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
GNU C++ (Debian 4.9.0-5) version 4.9.0 (x86_64-linux-gnu)
compiled by GNU C version 4.9.0, GMP version 6.0.0, MPFR version 3.1.2-p3,
MPC version 1.0.1
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: b8ef2963d5911ef424cca776623bf2bd
a.cpp: In member function ‘void A::repair()’:
a.cpp:7:58: error: no matching function for call to ‘A::wait(int)’
template <int> void repair() { wait<&A::notify>(0); }
^
a.cpp:7:58: note: candidate is:
a.cpp:3:38: note: template<int (A::* <anonymous>)()> void A::wait(int)
template <A::cont_func> void wait(int);
^
a.cpp:3:38: note: template argument deduction/substitution failed:
a.cpp:7:58: error: ‘&((A*)this)->*A::notify’ is not a valid template argument
for type ‘int (A::*)()’
template <int> void repair() { wait<&A::notify>(0); }
^
a.cpp:7:58: error: it must be a pointer-to-member of the form ‘&X::Y’
a.cpp:7:58: error: could not convert template argument
‘&((A*)this)->*A::notify’ to ‘int (A::*)()’
>From gcc-bugs-return-454036-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 12 16:22:57 2014
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From: "D.Bahadir at GMX dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/61489] New: Wrong warning with -Wmissing-field-initializers.
Date: Thu, 12 Jun 2014 16:22:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61489
Bug ID: 61489
Summary: Wrong warning with -Wmissing-field-initializers.
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: D.Bahadir at GMX dot de
Created attachment 32928
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32928&action=edit
test-case
This bug is related to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36750 but
addresses C++ instead of C.
When compiling the following code (in C++11 mode) with
-Wmissing-field-initializers then almost all attempts to initialize
"sockaddr_in" result in compiler-warnings about uninitialized field-members.
However, as far as I understand, almost all initializations should be fine and
zero-initialize (?) all struct-members and the compiler-warnings should
therefore not occur.
<code>
// Compile this code with: g++ -std=c++11 -Wmissing-field-initializers bug.cpp
#include <netinet/in.h>
int main()
{
struct sockaddr_in addr0; // No warning. But really zero-initialized?
//struct sockaddr_in addr1(); // No warning, but a function-declaration.
struct sockaddr_in addr2 = {}; // In C++: Warning about all members.
// In C: Warning about first member.
struct sockaddr_in addr3 = {0}; // In C++: Warning about all members
// except the first one.
struct sockaddr_in addr4 = {0,}; // Same here.
#ifdef __cplusplus
struct sockaddr_in addr5 = sockaddr_in(); // No warning and (probably)
// zero-initialized.
#endif
#if __cplusplus >= 201103L
struct sockaddr_in addr6{}; // Warning about all members.
struct sockaddr_in addr7{0}; // Warning about all members except the
// first one.
struct sockaddr_in addr8{0,}; // Same here.
struct sockaddr_in addr9 = sockaddr_in{}; // Warning about all members.
struct sockaddr_in addr10 = sockaddr_in{0}; // Warning about all members
// except the first one.
struct sockaddr_in addr11 = sockaddr_in{0,}; // Same here.
#endif
return 0;
}
</code>
When compiling this code the following warnings will be issued:
bug.cpp: In function ‘int main()’:
bug.cpp:9:33: warning: missing initializer for member ‘sockaddr_in::sin_family’
[-Wmissing-field-initializers]
struct sockaddr_in addr2 = {}; // In C++: Warning about all members.
^
bug.cpp:9:33: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
bug.cpp:9:33: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:9:33: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:11:34: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr3 = {0}; // In C++: Warning about all members
^
bug.cpp:11:34: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:11:34: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:13:35: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr4 = {0,}; // Same here.
^
bug.cpp:13:35: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:13:35: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:19:30: warning: missing initializer for member
‘sockaddr_in::sin_family’ [-Wmissing-field-initializers]
struct sockaddr_in addr6{}; // Warning about all members.
^
bug.cpp:19:30: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
bug.cpp:19:30: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:19:30: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:20:31: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr7{0}; // Warning about all members except the
^
bug.cpp:20:31: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:20:31: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:22:32: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr8{0,}; // Same here.
^
bug.cpp:22:32: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:22:32: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:23:45: warning: missing initializer for member
‘sockaddr_in::sin_family’ [-Wmissing-field-initializers]
struct sockaddr_in addr9 = sockaddr_in{}; // Warning about all
members.
^
bug.cpp:23:45: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
bug.cpp:23:45: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:23:45: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:24:46: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr10 = sockaddr_in{0}; // Warning about all members
^
bug.cpp:24:46: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:24:46: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
bug.cpp:26:47: warning: missing initializer for member ‘sockaddr_in::sin_port’
[-Wmissing-field-initializers]
struct sockaddr_in addr11 = sockaddr_in{0,}; // Same here.
^
bug.cpp:26:47: warning: missing initializer for member ‘sockaddr_in::sin_addr’
[-Wmissing-field-initializers]
bug.cpp:26:47: warning: missing initializer for member ‘sockaddr_in::sin_zero’
[-Wmissing-field-initializers]
>From gcc-bugs-return-454037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Jun 12 16:24:00 2014
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From: "D.Bahadir at GMX dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/61489] Wrong warning with -Wmissing-field-initializers.
Date: Thu, 12 Jun 2014 16:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida489
--- Comment #1 from Deniz Bahadir <D.Bahadir at GMX dot de> ---
This does not only occur with GCC 4.9.0 but also with older ones like 4.7 and
4.8.
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-06-30 14:27 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2014-06-12 16:21 [Bug c++/61488] New: Regression in template argument substitution in 4.9+ roland at digitalvampire dot org
2014-06-13 19:01 ` [Bug c++/61488] " jason at gcc dot gnu.org
2014-06-16 11:50 ` [Bug c++/61488] [4.9/4.10 regression] " jason at gcc dot gnu.org
2014-06-25 11:16 ` rguenth at gcc dot gnu.org
2014-06-26 12:48 ` [Bug c++/61488] [4.9 " rguenth at gcc dot gnu.org
2014-06-30 12:37 ` jason at gcc dot gnu.org
2014-06-30 14:27 ` jason at gcc dot gnu.org
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