Bug#705066: g++-4.7: wrong line indicated in warning for synthesized method

[Michał Mirosław <mirq-deboogs@rere.qmqm.pl>]

Package: g++-4.7
Version: 4.7.2-5
Severity: minor

$ g++ -c -std=c++11 -Wunused-parameter  test.cpp
test.cpp:3:8: warning: unused parameter ‘p’ [-Wunused-parameter]
test.cpp: In function ‘int main()’:
test.cpp:21:17: note: synthesized method ‘A& A::operator=(A&&)’ first
required here

$ cat test.cpp
#include <functional>

struct A  // line pointed-to by warning
{
        struct B
        {
                B& operator=(B&&) { return *this; }
        };

        B f;

        A() = default;
        A& operator=(A&& p) = default;  // where the method is declared
};

int main()
{
        A a;
        A b;

        b = std::move(a);
}

$ g++ -v
Using built-in specs.
COLLECT_GCC=/usr/bin/g++-4.7.real
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.7.2-5' --with-
bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-
languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7
--enable-shared --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-
gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-
sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-
time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --with-
arch-32=i586 --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 4.7.2 (Debian 4.7.2-5)



-- System Information:
Debian Release: 7.0
  APT prefers testing-proposed-updates
  APT policy: (500, 'testing-proposed-updates'), (500, 'testing'), (401, 'experimental'), (400, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.8.5 (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=pl_PL.UTF-8, LC_CTYPE=pl_PL.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages g++-4.7 depends on:
ii  gcc-4.7             4.7.2-5
ii  gcc-4.7-base        4.7.2-5
ii  libc6               2.13-38
ii  libgmp10            2:5.0.5+dfsg-2
ii  libmpc2             0.9-4
ii  libmpfr4            3.1.0-5
ii  libstdc++6-4.7-dev  4.7.2-5
ii  zlib1g              1:1.2.7.dfsg-13

g++-4.7 recommends no packages.

Versions of packages g++-4.7 suggests:
ii  g++-4.7-multilib    4.7.2-5
ii  gcc-4.7-doc         4.7.2-2
pn  libstdc++6-4.7-dbg  <none>

-- no debconf information