[Bug target/67280] New: [5 Regression] wrong C++11 code generated on arm-linux-gnueabihf

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67280

            Bug ID: 67280
           Summary: [5 Regression] wrong C++11 code generated on
                    arm-linux-gnueabihf
           Product: gcc
           Version: 5.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org
  Target Milestone: ---

seen with the 5 branch svn r226731 on arm-linux-gnueabihf, works with -O1,
fails with -O2. works on x86_64 and aarch64.

$ cat foo.cc
#include <iostream>
#include <exception>
#include <functional>

namespace
{
void run(std::function<void()> const& f)
{
    try
    {
        f();
    }
    catch (std::exception const& e)
    {
        std::cerr << "ignored exception: " << e.what() << std::endl;
    }
}
}

int main()
{
    run([]{ throw std::runtime_error("some error"); });
    run([]{ throw std::runtime_error("some error"); });
}

$ g++ -O1 -std=c++11 foo.cc && ./a.out
ignored exception: some error
ignored exception: some error
$ g++ -O2 -std=c++11 foo.cc && ./a.out
terminate called after throwing an instance of 'std::runtime_error'
  what():  some error
Aborted
$ g++ -Os -std=c++11 foo.cc && ./a.out
terminate called after throwing an instance of 'std::runtime_error'
  what():  some error
Aborted

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/5/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.2.1-15ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs
--enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-5 --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 --disable-libitm
--disable-libquadmath --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-5-armhf/jre --enable-java-home
--with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-armhf
--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-armhf
--with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --enable-multilib --disable-sjlj-exceptions
--with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb
--disable-werror --enable-multilib --enable-checking=release
--build=arm-linux-gnueabihf --host=arm-linux-gnueabihf
--target=arm-linux-gnueabihf
Thread model: posix
gcc version 5.2.1 20150808 (Ubuntu 5.2.1-15ubuntu1)