From 23ac66738eaa545e2f149c9aa9c3ddaf12170949 Mon Sep 17 00:00:00 2001
From: Alex Arslan <ararslan@comcast.net>
Date: Sun, 5 Aug 2018 12:07:06 +0100
Subject: [PATCH] Work around invalid register errors with 64-bit Windows

Adding `-fno-asynchronous-unwind-tables` to the C compiler flags passed
to OpenBLAS works around errors claiming an invalid register for
`.seh_savexmm`. We've been running into this on the 64-bit Windows
buildbots.

See discussion in https://github.com/xianyi/OpenBLAS/issues/1708.
---
 deps/blas.mk | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/deps/blas.mk b/deps/blas.mk
index 26e985be75869..c025d4ac26e39 100644
--- a/deps/blas.mk
+++ b/deps/blas.mk
@@ -62,6 +62,15 @@ OPENBLAS_FFLAGS += -mincoming-stack-boundary=2
 endif
 endif
 
+# Work around invalid register errors on 64-bit Windows
+# See discussion in https://github.com/xianyi/OpenBLAS/issues/1708
+# TODO: Remove this once we use a version of OpenBLAS where this is set automatically
+ifeq ($(OS),WINNT)
+ifeq ($(ARCH),x86_64)
+OPENBLAS_CFLAGS += -fno-asynchronous-unwind-tables
+endif
+endif
+
 OPENBLAS_BUILD_OPTS += CFLAGS="$(CFLAGS) $(OPENBLAS_CFLAGS)"
 OPENBLAS_BUILD_OPTS += FFLAGS="$(FFLAGS) $(OPENBLAS_FFLAGS)"
 OPENBLAS_BUILD_OPTS += LDFLAGS="$(LDFLAGS) $(RPATH_ESCAPED_ORIGIN)"