[Bug c++/62229] New: Broken uniform initialization when using std::string ctor

[tnozicka at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62229

            Bug ID: 62229
           Summary: Broken uniform initialization when using std::string
                    ctor
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tnozicka at gmail dot com

Hi,
IMHO this two examples should have same result, but ...

// A
std::string s1{10, '\0'};
std::cout << s1.length() << std::endl;  // prints 2 - wrong

// B
std::string s2(10, '\0');
std::cout << s2.length() << std::endl;  // prints 10 - right


Probable reason is, that A is preferring ctor version with
std::initializer_list, but that version (AFAIK) should be invoked as:
std::string s1{{10, '\0'}};


=== g++ flags ===
-std=c++14 -Wall -Wextra

=== configure ===
Using built-in specs.
COLLECT_GCC=/opt/szn/bin/g++-4.9
COLLECT_LTO_WRAPPER=/opt/szn/lib/gcc/x86_64-linux-gnu/4.9.1/lto-wrapper
Target: x86_64-linux-gnu
Configured with: /home/tomas/packages/gcc/gcc-4.9.1/configure --prefix=/opt/szn
--program-suffix=-4.9 --enable-languages=c++ --disable-multilib --enable-shared
--enable-threads=posix --enable-checking=release --enable-__cxa_atexit
--enable-gnu-unique-object --enable-linker-build-id
--with-linker-hash-style=gnu --enable-plugin --with-tune=generic
--enable-libstdcxx-time=yes --enable-libstdcxx-debug
--enable-version-specific-runtime-libs --enable-objc-gc --enable-clocale=gnu
--disable-install-libiberty --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu --libdir=/opt/szn/lib --libexecdir=/opt/szn/lib
--infodir=/opt/szn/share/info-gcc-4.9 --localedir=/opt/szn/share/locale-gcc-4.9
--mandir=/opt/szn/share/man-gcc-4.9
--with-gxx-include-dir=/opt/szn/include/c++/4.9
Thread model: posix
gcc version 4.9.1 (GCC)