[Bug gdb/31088] New: gdb requires build directories to exist

["giecrilj at stegny dot 2a.pl" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31088

            Bug ID: 31088
           Summary: gdb requires build directories to exist
           Product: gdb
           Version: 12.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: giecrilj at stegny dot 2a.pl
  Target Milestone: ---

Summary:

gdb cannot move up a directory that does not exist in the source tree when
looking for a source file.

Steps to reproduce on Ubuntu 22.04:

1. {
  DEBUGINFOD_URLS='https://debuginfod.ubuntu.com' &&
  export DEBUGINFOD_URLS; }

2. set debuginfod enabled on

3. attach to a running yelp

3.1. debuginfod will download debuginfo and refuse to download source files

4. {
  cd
"${HOME}/.cache/debuginfod_client/a4f415af56b06f1f38d5a0339dd9828ff136b115/" &&
  apt source libc6 && cd ../c74e800dfd5f72649d673b44292f4a817e45150b/ &&
  apt source libglib2.0-0; }

5. dir
${HOME}/.cache/debuginfod_client/a4f415af56b06f1f38d5a0339dd9828ff136b115/glibc-2.35

6. dir
${HOME}/.cache/debuginfod_client/c74e800dfd5f72649d673b44292f4a817e45150b/glib2.0-2.72.4

7. detach and attach

8. up

Expected result:
4518          ret = (*poll_func) (fds, n_fds, timeout);

Actual result:
Continuing without source file ./debian/build/deb/../../../glib/gmain.c.
4518    ../../../glib/gmain.c: No such file.

Work-around:
{ install -d
"${HOME}/.cache/debuginfod_client/c74e800dfd5f72649d673b44292f4a817e45150b/glib2.0-2.72.4/debian/build/deb";
}

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