ecm build failure on cygwinminimal
https://github.com/mkoeppe/sage/runs/493864794
libtool: compile: gcc DHAVE_CONFIG_H I. I./x86_64 I/cygdrive/d/a/sage/sage/local/include I/cygdrive/d/a/sage/sage/local/include g march=native g O3 fPIC c ecm.c DDLL_EXPORT DPIC o .libs/libecm_laecm.o
In file included from sp.h:33,
from ecmimpl.h:29,
from ecm.c:26:
ecmgmp.h:134:8: warning: '__gmpn_redc_n' redeclared without dllimport attribute: previous dllimport ignored [Wattributes]
134  void __gmpn_redc_n (mp_ptr, mp_ptr, mp_srcptr, mp_size_t, mp_srcptr);
 ^~~~~~~~~~~~~
/tmp/cco2lRak.s: Assembler messages:
/tmp/cco2lRak.s:1351: Error: invalid register for .seh_savexmm
/tmp/cco2lRak.s:1776: Error: invalid register for .seh_savexmm
make[6]: *** [Makefile:1085: libecm_laecm.lo] Error 1
make[6]: Leaving directory '/cygdrive/d/a/sage/sage/local/var/tmp/sage/build/ecm7.0.4.p1/src'
Change History (10)
Milestone: 
sage9.1 →
sage9.2

Status: 
new →
needs_info

Milestone: 
sage9.2 →
sage9.3

Milestone: 
sage9.3 →
sage9.4

Milestone: 
sage9.4 →
sage9.5

Milestone: 
sage9.5 →
sage9.6

Milestone: 
sage9.6 →
sage9.7

Milestone: 
sage9.7 →
sageduplicate/invalid/wontfix

Status: 
needs_info →
needs_review

Reviewers: 
→ Kwankyu Lee

Status: 
needs_review →
positive_review

Resolution: 
→ invalid

Status: 
positive_review →
closed

This failure seems to depend on the CPU where it gets to run. It built correctly on cygwinminimal at https://github.com/mkoeppe/sage/runs/518106009