From b57de923d8c725ef8d55e7ad458f1f456f98adbf Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Sun, 2 Jun 2019 19:45:08 +0200
Subject: curve25519: not all linkers support bmi2 and adx

---
 src/compat/Kbuild.include | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/compat/Kbuild.include')

diff --git a/src/compat/Kbuild.include b/src/compat/Kbuild.include
index 34398dc..95041a9 100644
--- a/src/compat/Kbuild.include
+++ b/src/compat/Kbuild.include
@@ -75,4 +75,14 @@ ifeq ($(CONFIG_X86_64),y)
 		ccflags-y += $(avx512_instr)
 		asflags-y += $(avx512_instr)
 	endif
+	ifeq ($(bmi2_instr),)
+		bmi2_instr :=$(call as-instr,mulx %rax$(comma)%rax$(comma)%rax,-DCONFIG_AS_BMI2=1)
+		ccflags-y += $(bmi2_instr)
+		asflags-y += $(bmi2_instr)
+	endif
+	ifeq ($(adx_instr),)
+		adx_instr :=$(call as-instr,adcx %rax$(comma)%rax,-DCONFIG_AS_ADX=1)
+		ccflags-y += $(adx_instr)
+		asflags-y += $(adx_instr)
+	endif
 endif
-- 
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