From 2ec90792d7ef6a0acf32cca3dca7089ab317b01e Mon Sep 17 00:00:00 2001
From: marktwtn <marktwtn@gmail.com>
Date: Tue, 23 Jul 2019 15:17:07 +0800
Subject: [PATCH] build: Add de10-nano board specific compiler flags

-mcpu=cortex-a9:
The CPU of de10-nano board is Cortex-A9.
-mfloat-abi=softfp:
The NEON intrinsics are not available with the soft option.
Use softfp instead of soft.
-mfpu=neon:
neon equals to neon-vfpv3.
---
 Makefile    | 3 +++
 mk/board.mk | 3 +++
 2 files changed, 6 insertions(+)
 create mode 100644 mk/board.mk

diff --git a/Makefile b/Makefile
index 0a42915..011b7c7 100644
--- a/Makefile
+++ b/Makefile
@@ -35,6 +35,9 @@ include mk/cpu-features.mk
 # Handle git submodule
 include mk/submodule.mk
 
+# Board specific compiler flags
+include mk/board.mk
+
 # Assign the hardware to CPU if no hardware is specified
 PLATFORMS := $(BUILD_AVX) $(BUILD_SSE) $(BUILD_GENERIC) $(BUILD_GPU) $(BUILD_FPGA_ACCEL)
 ENABLE_PLATFORMS := $(findstring 1,$(PLATFORMS))
diff --git a/mk/board.mk b/mk/board.mk
new file mode 100644
index 0000000..8c4e944
--- /dev/null
+++ b/mk/board.mk
@@ -0,0 +1,3 @@
+ifeq ($(BOARD),de10nano)
+    CFLAGS += -mcpu=cortex-a9 -mfloat-abi=softfp -mfpu=neon
+endif