[Bug testsuite/29325] New: [gdb/guile] Fails in gdb.gdb/{python-helper,selftest}.exp when building with guile (sigsegv in libgc1)

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29325

            Bug ID: 29325
           Summary: [gdb/guile] Fails in
                    gdb.gdb/{python-helper,selftest}.exp when building
                    with guile (sigsegv in libgc1)
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: testsuite
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

When building gdb with guile, I run into a bunch of testsuite failures:
...
FAIL: gdb.gdb/python-helper.exp: start inner gdb (timeout)
FAIL: gdb.gdb/python-helper.exp: loading test binary into inner GDB (got
interactive prompt)
FAIL: gdb.gdb/python-helper.exp: print integer from DWARF info
FAIL: gdb.gdb/python-helper.exp: pretty print type->main_type for DWARF type
FAIL: gdb.gdb/python-helper.exp: hit breakpoint in outer gdb again
FAIL: gdb.gdb/python-helper.exp: print *type->main_type
FAIL: gdb.gdb/selftest.exp: xgdb is at prompt
FAIL: gdb.gdb/selftest.exp: send ^C to child process (timeout)
FAIL: gdb.gdb/selftest.exp: send SIGINT signal to child process (timeout)
FAIL: gdb.gdb/selftest.exp: send ^C to child process again (timeout)
FAIL: gdb.gdb/selftest.exp: thread 1 (timeout)
FAIL: gdb.gdb/selftest.exp: backtrace through signal handler (timeout)
...

In more detail:
...
Thread 1 "xgdb" received signal SIGSEGV, Segmentation fault.^M
0x00007ffff71f1aa3 in ?? () from /lib64/libgc.so.1^M
(outer-gdb) FAIL: gdb.gdb/python-helper.exp: start inner gdb (timeout)
...

This is actually documented behaviour ( https://hboehm.info/gc/debugging.html
).

So there's nothing wrong with gdb.  Building gdb with guile makes gdb "a
program that uses libgc1".  The same behaviour can be reproduced by debugging a
simple:
...
$ cat test.c
#include "gc.h"

int
main (void)
{
  GC_INIT ();
  return 0;
}
...
compiled like:
...
$ gcc test.c -lgc
...

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