[Bug gdb/12790] New: GDB is unable to do inf-call of vararg of type _Complex on x86_64-linux

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

http://sourceware.org/bugzilla/show_bug.cgi?id=12790

           Summary: GDB is unable to do inf-call of vararg of type
                    _Complex on x86_64-linux
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: qiyao@gcc.gnu.org


Created attachment 5741
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5741
test case

GDB on x86_64-linux is unable to handl inf-call of vararg function of parameter
type _Complex.  Here are the steps to reproduce.

$ gcc -g complex.c -o complex

$ ./gdb/gdb complex
...
(gdb) b main
(gdb) run
Starting program: /scratch/yao/gdb_cvs/build-x86_64/complex

Breakpoint 1, main () at ../../complex.c:25
25        return 0;
(gdb) print find_max_float_real(4, fc1, fc2, fc3, fc4)
During symbol reading, incomplete CFI data; unspecified registers (e.g., rax)
at 0x40044c.
$1 = 0 + 0 * I  <-- wrong result.
(gdb) print find_max_double_real(4, dc1, dc2, dc3, dc4)
$2 = 0 + 0 * I  <-- wrong result.

(gdb) print find_max_long_double_real(4, ldc1, ldc2, ldc3, ldc4)
../../src/gdb/amd64-tdep.c:622: internal-error: amd64_return_value: Assertion
`len <= 16' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) n

../../src/gdb/amd64-tdep.c:622: internal-error: amd64_return_value: Assertion
`len <= 16' failed.
A problem internal to GDB has been detected,

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