[Bug 2141579] [NEW] libstdc++-15-dev needs to fix libstdc++.modules.json contents

[Ben Boeckel]

Public bug reported:

The /usr/lib/gcc/x86_64-linux-gnu/15/libstdc++.modules.json file
contains the following contents:

```
{
  "version": 1,
  "revision": 1,
  "modules": [
    {
      "logical-name": "std",
      "source-path": "../include/c++/15/bits/std.cc",
      "is-std-library": true
    },
    {
      "logical-name": "std.compat",
      "source-path": "../include/c++/15/bits/std.compat.cc",
      "is-std-library": true
    }
  ]
}
```

This is incorrect because `std.cc` actually lives at
/usr/include/c++/15/bits/std.cc. I suspect packaging is relocating files
manually rather than informing the `install` process of their ultimate
distinations. Whatever is relocating either `std.cc` or the
`libstdc++.modules.json` file needs to update the contents to be
consistent with their final locations.

Also likely applies to other `libstdc++.modules.json`-shipping gcc
versions.

** Affects: gcc-15 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to gcc-15 in Ubuntu.
https://bugs.launchpad.net/bugs/2141579

Title:
  libstdc++-15-dev needs to fix libstdc++.modules.json contents

Status in gcc-15 package in Ubuntu:
  New

Bug description:
  The /usr/lib/gcc/x86_64-linux-gnu/15/libstdc++.modules.json file
  contains the following contents:

  ```
  {
    "version": 1,
    "revision": 1,
    "modules": [
      {
        "logical-name": "std",
        "source-path": "../include/c++/15/bits/std.cc",
        "is-std-library": true
      },
      {
        "logical-name": "std.compat",
        "source-path": "../include/c++/15/bits/std.compat.cc",
        "is-std-library": true
      }
    ]
  }
  ```

  This is incorrect because `std.cc` actually lives at
  /usr/include/c++/15/bits/std.cc. I suspect packaging is relocating
  files manually rather than informing the `install` process of their
  ultimate distinations. Whatever is relocating either `std.cc` or the
  `libstdc++.modules.json` file needs to update the contents to be
  consistent with their final locations.

  Also likely applies to other `libstdc++.modules.json`-shipping gcc
  versions.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gcc-15/+bug/2141579/+subscriptions