[Bug 2061828] [NEW] Compile fails with -fconcepts -std=gnu++14

[Peter Krefting]

Public bug reported:

$ cat /tmp/try.cc 
#include <vector>

int main()
{
    return 0;
}
$ g++ -fconcepts -std=gnu++14 -o try try.cc
In file included from /usr/include/c++/13/vector:67,
                 from try.cc:1:
/usr/include/c++/13/bits/stl_bvector.h:597:18: error: ‘is_default_constructible_v’ was not declared in this scope; did you mean ‘is_default_constructible’?
  597 |         requires is_default_constructible_v<_Bit_alloc_type>
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                  is_default_constructible
/usr/include/c++/13/bits/stl_bvector.h:597:9: error: expression must be enclosed in parentheses
  597 |         requires is_default_constructible_v<_Bit_alloc_type>
      |         ^~~~~~~~
/usr/include/c++/13/bits/stl_bvector.h:597:9: error: expected ‘;’ at end of member declaration
  597 |         requires is_default_constructible_v<_Bit_alloc_type>
      |         ^~~~~~~~
      |                 ;
/usr/include/c++/13/bits/stl_bvector.h:597:18: error: ‘is_default_constructible_v’ does not name a type; did you mean ‘is_default_constructible’?
  597 |         requires is_default_constructible_v<_Bit_alloc_type>
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                  is_default_constructible

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: g++ 4:13.2.0-7ubuntu1
ProcVersionSignature: Ubuntu 6.8.0-22.22-generic 6.8.1
Uname: Linux 6.8.0-22-generic x86_64
ApportVersion: 2.28.0-0ubuntu1
Architecture: amd64
CasperMD5CheckResult: pass
CloudArchitecture: x86_64
CloudID: none
CloudName: none
CloudPlatform: none
CloudSubPlatform: config
Date: Tue Apr 16 12:32:20 2024
InstallationDate: Installed on 2024-01-03 (104 days ago)
InstallationMedia: Ubuntu-Server 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230810)
SourcePackage: gcc-defaults
UpgradeStatus: Upgraded to noble on 2024-04-12 (4 days ago)

** Affects: gcc-defaults (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2061828

Title:
  Compile fails with -fconcepts -std=gnu++14

Status in gcc-defaults package in Ubuntu:
  New

Bug description:
  $ cat /tmp/try.cc 
  #include <vector>

  int main()
  {
      return 0;
  }
  $ g++ -fconcepts -std=gnu++14 -o try try.cc
  In file included from /usr/include/c++/13/vector:67,
                   from try.cc:1:
  /usr/include/c++/13/bits/stl_bvector.h:597:18: error: ‘is_default_constructible_v’ was not declared in this scope; did you mean ‘is_default_constructible’?
    597 |         requires is_default_constructible_v<_Bit_alloc_type>
        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
        |                  is_default_constructible
  /usr/include/c++/13/bits/stl_bvector.h:597:9: error: expression must be enclosed in parentheses
    597 |         requires is_default_constructible_v<_Bit_alloc_type>
        |         ^~~~~~~~
  /usr/include/c++/13/bits/stl_bvector.h:597:9: error: expected ‘;’ at end of member declaration
    597 |         requires is_default_constructible_v<_Bit_alloc_type>
        |         ^~~~~~~~
        |                 ;
  /usr/include/c++/13/bits/stl_bvector.h:597:18: error: ‘is_default_constructible_v’ does not name a type; did you mean ‘is_default_constructible’?
    597 |         requires is_default_constructible_v<_Bit_alloc_type>
        |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~
        |                  is_default_constructible

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: g++ 4:13.2.0-7ubuntu1
  ProcVersionSignature: Ubuntu 6.8.0-22.22-generic 6.8.1
  Uname: Linux 6.8.0-22-generic x86_64
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CloudArchitecture: x86_64
  CloudID: none
  CloudName: none
  CloudPlatform: none
  CloudSubPlatform: config
  Date: Tue Apr 16 12:32:20 2024
  InstallationDate: Installed on 2024-01-03 (104 days ago)
  InstallationMedia: Ubuntu-Server 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230810)
  SourcePackage: gcc-defaults
  UpgradeStatus: Upgraded to noble on 2024-04-12 (4 days ago)

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