[Bug tdep/29247] [gdb, tdep] ../../gdb/ppc-sysv-tdep.c:1945: internal-error: ppc64_sysv_abi_return_value: Assertion `ok' failed

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

https://sourceware.org/bugzilla/show_bug.cgi?id=29247

--- Comment #27 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #23)
> Unfortunately, I don't have access to a machine atm to investigate this.

I was able to get my hands on a machine, and reproduced it.

I minimized it to:
...
$ cat gdb/testsuite/gdb.base/varargs.c
#include <stdarg.h>
#include <stdlib.h>

long double _Complex orig = 4.0L + 4.0Li;
long double _Complex copy = 0L + 0Li;

int
test (void)
{
  return 0;
}

void
do_copy (int num_vals, ...)
{
#if 1
  va_list argp;
  va_start (argp, num_vals);
  copy = va_arg (argp, long double _Complex);
#else
  copy = orig;
#endif
}

void
_start (void)
{
  test ();

  while (1)
    ;
}
...
and:
...
$ cat gdb/testsuite/gdb.base/varargs.exp
standard_testfile .c

set additional_flags {debug}
lappend additional_flags "additional_flags=-nostdlib"

# build the first test case
if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
           executable ${additional_flags}] != "" } {
     untested "failed to compile"
     return -1
}

# Start with a fresh gdb.

clean_restart ${binfile}

gdb_test_no_output "set print sevenbit-strings"
gdb_test_no_output "set print address off"
gdb_test_no_output "set width 0"

runto test

gdb_test "print orig" ".*= 4 \\+ 4i"
gdb_test "print copy" ".*= 0 \\+ 0i"

gdb_test "print do_copy (1, orig)"

with_test_prefix "after copy" {
    gdb_test "print orig" ".*= 4 \\+ 4i"
    gdb_test "print copy" ".*= 4 \\+ 4i"
}
...

This doesn't seem to be related to the return value passing bit, so I propose
to close this PR and file a new one (assuming this is an unknown issue).

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