[Bug 1593608] Re: __FUNCTION__ causes g++ internal compiler error in constexpr functions

[Martin Pitt]

Hello Curtis, or anyone else affected,

Accepted gcc-5 into xenial-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/gcc-5/5.4.0-6ubuntu1~16.04 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: gcc-5 (Ubuntu Xenial)
       Status: New => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1593608

Title:
  __FUNCTION__ causes g++ internal compiler error in constexpr functions

Status in gcc-5 package in Ubuntu:
  Fix Released
Status in gcc-5 source package in Xenial:
  Fix Committed

Bug description:
  // bug.cpp
  // g++ -std=c++14 bug.cpp -DCAUSE_GCC_INTERNAL_COMPILER_ERROR
  inline constexpr bool bug() noexcept {
  #ifdef CAUSE_GCC_INTERNAL_COMPILER_ERROR
    auto tmp = __FUNCTION__; // same for __PRETTY_FUNCTION__
  #else
    auto tmp = "bug";
  #endif
    return true;
  }
  static_assert(bug(), "g++ 5.3.1 bug");
  int main(int, const char *[]) { return 0; }

  $ g++ -std=c++14 bug.cpp

  $ g++ -std=c++14 bug.cpp -DCAUSE_GCC_INTERNAL_COMPILER_ERROR
  bug.cpp:11:18:   in constexpr expansion of ‘bug()’
  bug.cpp:11:38: internal compiler error: Segmentation fault
   static_assert(bug(), "g++ 5.3.1 bug");
                                        ^
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.

  $ gcc --version
  gcc (Ubuntu 5.3.1-14ubuntu2.1) 5.3.1 20160413
  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.

  $ cat /etc/lsb-release 
  DISTRIB_ID=Ubuntu
  DISTRIB_RELEASE=16.04
  DISTRIB_CODENAME=xenial
  DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"

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