From c91575ceec8579c03da3470a3f66e337fdd643f0 Mon Sep 17 00:00:00 2001
From: Alex Richardson <arichardson@FreeBSD.org>
Date: Thu, 23 Aug 2018 18:19:33 +0000
Subject: [PATCH] Don't build skein_block_asm.s if we don't have an as binary

This fixes building libmd on MacOS/Linux. The real fix is probably to
build it as a .S file with $CC instead. It might also be better to just
compile the C file in userspace since the compiler can the use SSE/AVX.

Reviewed By:	emaste, brooks
Approved By:	jhb (mentor)
Differential Revision: https://reviews.freebsd.org/D16844
---
 lib/libmd/Makefile | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/libmd/Makefile b/lib/libmd/Makefile
index 131b3cd400d2..e90569dd1782 100644
--- a/lib/libmd/Makefile
+++ b/lib/libmd/Makefile
@@ -1,5 +1,7 @@
 # $FreeBSD$
 
+.include <src.opts.mk>
+
 PACKAGE=lib${LIB}
 LIB=	md
 SHLIB_MAJOR= 6
@@ -114,11 +116,15 @@ SRCS+=	rmd160.S
 CFLAGS+= -DRMD160_ASM
 .endif
 .if exists(${MACHINE_ARCH}/skein_block_asm.s)
+.if defined(XAS) || ${MK_BINUTILS_BOOTSTRAP} != "no"
 AFLAGS += --strip-local-absolute
 # Fully unroll all loops in the assembly optimized version
 AFLAGS+= --defsym SKEIN_LOOP=0
 SRCS+= skein_block_asm.s
 CFLAGS+= -DSKEIN_ASM -DSKEIN_USE_ASM=1792 # list of block functions to replace with assembly: 256+512+1024 = 1792
+.else
+.warning as not available: not using optimized Skein asm
+.endif
 .endif
 .if exists(${MACHINE_ARCH}/sha.S) || exists(${MACHINE_ARCH}/rmd160.S) || exists(${MACHINE_ARCH}/skein_block_asm.s)
 ACFLAGS+= -DELF -Wa,--noexecstack