From 6a4344ccc7a176cf5c0953ea26acbfba15a0fded Mon Sep 17 00:00:00 2001
From: John Zhao <johnzhao@slightech.com>
Date: Thu, 8 Mar 2018 17:33:41 +0800
Subject: [PATCH] Update makefile

---
 CommonDefs.mk |  6 +++---
 Makefile      | 14 ++++++++++++++
 2 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/CommonDefs.mk b/CommonDefs.mk
index fe9f60d..11cda72 100644
--- a/CommonDefs.mk
+++ b/CommonDefs.mk
@@ -52,7 +52,7 @@ else
   DUMMY := $(error "Can't detect host os")
 endif
 
-UNAME_M = $(shell uname -m)
+UNAME_M := $(shell uname -m)
 ifneq ($(findstring x86_64,$(UNAME_M)),)
   HOST_ARCH := x64
 else ifneq ($(findstring x86,$(UNAME_M)),)
@@ -73,7 +73,7 @@ endif
 
 HOST_NAME := $(HOST_OS)
 ifeq ($(HOST_OS),Linux)
-  UNAME_A = $(shell uname -a)
+  UNAME_A := $(shell uname -a)
   ifneq ($(findstring tegra,$(UNAME_A)),)
     HOST_NAME := Tegra
   else ifneq ($(findstring jetsonbot,$(UNAME_A)),)
@@ -147,7 +147,7 @@ endif
 
 ifeq ($(HOST_OS),Win)
 ifeq ($(HOST_ARCH),x64)
-  VS_VERSION = $(shell echo "$(shell which cl)" | sed -e "s/.*Visual\sStudio\s\([0-9]\+\).*/\1/g")
+  VS_VERSION := $(shell echo "$(shell which cl)" | sed "s/.*Visual\sStudio\s\([0-9]\+\).*/\1/g")
   ifeq (15,$(VS_VERSION))
     CMAKE += -G "Visual Studio 15 2017 Win64"
   else ifeq (14,$(VS_VERSION))
diff --git a/Makefile b/Makefile
index bc601a2..cb3db3b 100644
--- a/Makefile
+++ b/Makefile
@@ -21,3 +21,17 @@ opendoc: apidoc
 		html=./doc/output/$$lang/html/index.html; \
 		[ -f "$$html" ] && sh ./scripts/open.sh $$html; \
 	done
+
+host:
+	@$(call echo,Make $@)
+	@echo HOST_OS: $(HOST_OS)
+	@echo HOST_ARCH: $(HOST_ARCH)
+	@echo ECHO: $(ECHO)
+	@echo CC: $(CC)
+	@echo CXX: $(CXX)
+	@echo MAKE: $(MAKE)
+	@echo BUILD: $(BUILD)
+	@echo FIND: $(FIND)
+	@echo LDD: $(LDD)
+	@echo CMAKE: $(CMAKE)
+	@#$(FIND) . -name READ*