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Failing 'make check' for non-Cygwin GMP-ECM package

I'm seeing an odd issue after building the GMP-ECM 6.4.4 package from Inria. I downloaded the .tar.gz file and unpacked, ran configure, then make and 'make check'. I get a SIGSEGV from a test using ecm.exe as part of 'make check'.

Debugging with gdb, I see something odd and would appreciate any thoughts on where I should take this issue. The faulting source line is mpmod.c:343 which reads:
  REDC2(rp, cp, np, nn, invm);
This macro expands to a call to __gmpn_redc_2(). That function is at an address above the 4GB line (this is on Win7 64-bit) as seen here:

(gdb) i func ^__gmpn_redc_2$
All functions matching regular expression "^__gmpn_redc_2$":

Non-debugging symbols:
0x00000003fcbee9e8  __gmpn_redc_2

But the instructions generated for that source line look like this:
(gdb) x/7i $rip
=> 0x1004166c0 <__ecm_mpres_get_z+240>: mov    0x10(%rdi),%rax
   0x1004166c4 <__ecm_mpres_get_z+244>: mov    %rbp,%r9
   0x1004166c7 <__ecm_mpres_get_z+247>: mov    %r13,%r8
   0x1004166ca <__ecm_mpres_get_z+250>: mov    %r12,%rcx
   0x1004166cd <__ecm_mpres_get_z+253>: mov    %rax,0x20(%rsp)
   0x1004166d2 <__ecm_mpres_get_z+258>: callq  0xfcbee9e8
   0x1004166d7 <__ecm_mpres_get_z+263>: test   %rax,%rax

Notice how the callq instruction has a truncated address. I thought maybe there's an issue with displaying that instruction (unlikely I know) so I stepped by instruction, but no, the truncated address is actually hit:
(gdb) si
0x00000001004166c4      343       REDC2(rp, cp, np, nn, invm);
0x00000001004166c7      343       REDC2(rp, cp, np, nn, invm);
0x00000001004166ca      343       REDC2(rp, cp, np, nn, invm);
0x00000001004166cd      343       REDC2(rp, cp, np, nn, invm);
0x00000001004166d2      343       REDC2(rp, cp, np, nn, invm);
0x00000000fcbee9e8 in ?? ()
Program received signal SIGSEGV, Segmentation fault.
0x00000000fcbee9e8 in ?? ()

I'm current on all Cygwin packages such as binutils. Does the above look like a linker issue or linker misuse (e.g. missing option)? Could there be a mismatch of object file arch between my just-built GMP-ECM and Cygwin's libgmp-devel? Or something else? If it doesn't seem like a Cygwin issue I can take it upstream to Inria.
Thanks much,


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