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

["cel at us dot ibm.com" <sourceware-bugzilla@sourceware.org>]

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

--- Comment #10 from Carl E Love <cel at us dot ibm.com> ---
Looking at the code from Tom and the comments from Ulrich, it appears that we
just need to check for floatformats_ieee_quad in addition to the check for
floatformats_ibm_long_double.  

I created a patch to change the check for floatformats_ibm_long_double to check
for both.  The patch fixes the assert issue.  However, there does appear to be
an additional issue with printing the value of long double _Complex with a
format of
"d".  

p/d check_arg_struct_01_01 (ref_val_struct_01_01)
$1 = 0
(gdb) FAIL: gdb.base/infcall-nested-structs-c.exp: types-tldc: p/d
check_arg_struct_01_01 (ref_val_struct_01_01)

I notice that the prints fail for:

complex, int, length 4
complex, float, length 16

in all cases we have:
      gdbarch_long_double_format (gdbarch) == floatformats_ieee_quad

I added Tom's self test to gdb.  With my patch that is checking for IBM long
double and ieee quad, the self test causes gdb to assert on the ok.  In that
case, I see the value is complex, floating point, length 16 and
gdbarch_long_double_format (gdbarch) is mapped to floatformats_ieee_double
which appears to be consistent with Tom's result. 

It looks to me as the self test is not being compiled with the correct setting
for gdbarch_long_double_format (gdbarch)?  I have not figure out why yet,
thoughts?

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