[Bug 1725848] Re: libstdc++-5-dev:amd64 5.5.0-1ubuntu1 configured without _GLIBCXX_USE_C99

[Dimitri John Ledkov]

huh, one should not use libstdc++5 at all ever. One should only use
libstdc++6. libstdc++5 is pre-historic ABI from the 90s no?

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Title:
  libstdc++-5-dev:amd64 5.5.0-1ubuntu1 configured without
  _GLIBCXX_USE_C99

Status in gcc-5 package in Ubuntu:
  Won't Fix

Bug description:
  Test program compiled on Artful Aardvark Ubuntu 17.10.

  $ which g++-5
  /usr/bin/g++-5

  $ /usr/bin/g++-5 --version
  g++-5 (Ubuntu 5.5.0-1ubuntu1) 5.4.1 20171010
  Copyright (C) 2015 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.

  $ /usr/bin/g++-5 -std=c++11 -x c++ - <<EOF
  #include <iostream>
  #include <string>
  int main()
  {
    std::cout << std::to_string(0) << '\n';
    return 0;
  }
  EOF 

  Expected result
   
  compile without errors, output 0

  Actual result

  <stdin>: In function ‘int main()’:
  <stdin>:5:16: error: ‘to_string’ is not a member of ‘std’

  Supposed cause

  _GLIBCXX_USE_C99 is not set in 
  /usr/include/x86_64-linux-gnu/c++/5/bits/c++config.h
  in package libstdc++-5-dev:amd64 5.5.0-1ubuntu1

  Further information

  Test program compiles and runs on Zesty Zapus with package
  libstdc++-5-dev:amd64 (5.4.1-8ubuntu1).

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