From bce6c42c4ad5213126adcf13786642589750776f Mon Sep 17 00:00:00 2001
From: David Hunt <david.hunt@intel.com>
Date: Fri, 4 Aug 2017 11:39:02 +0100
Subject: [PATCH] mk: add sensible default target with defconfig

Users can now use 'make defconfig' to generate a configuration using
the most appropriate defaults for the current machine.

<arch-machine-execenv-toolchain>
  arch taken from uname -m
  machine defaults to native
  execenv is taken from uname, Linux=linuxapp, otherwise bsdapp
  toolchain is taken from $CC -v to see which compiler to use

Signed-off-by: David Hunt <david.hunt@intel.com>
Acked-by: Shreyansh Jain <shreyansh.jain@nxp.com>
Tested-by: Jerin Jacob <jerin.jacob@caviumnetworks.com>
Acked-by: Thomas Monjalon <thomas@monjalon.net>
---
 doc/build-sdk-quick.txt |  3 +++
 mk/rte.sdkconfig.mk     | 28 +++++++++++++++++++++++++---
 mk/rte.sdkroot.mk       |  4 ++--
 3 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/doc/build-sdk-quick.txt b/doc/build-sdk-quick.txt
index 8d4105254f..2b5d4931fa 100644
--- a/doc/build-sdk-quick.txt
+++ b/doc/build-sdk-quick.txt
@@ -1,7 +1,10 @@
 Basic build
+	make defconfig && make
+	or
 	make config T=x86_64-native-linuxapp-gcc && make
 Build commands
 	config           get configuration from target template (T=)
+	defconfig        auto-select target template based on arch, OS, etc.
 	all              same as build (default rule)
 	build            build in a configured directory
 	clean            remove files but keep configuration
diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
index 1f2d6bdfa0..97363416a7 100644
--- a/mk/rte.sdkconfig.mk
+++ b/mk/rte.sdkconfig.mk
@@ -60,16 +60,38 @@ showconfigs:
 
 .PHONY: notemplate
 notemplate:
-	@printf "No template specified. "
-	@echo "Use T=template among the following list:"
+	@printf "No template specified. Use 'make defconfig' or "
+	@echo "use T=template from the following list:"
 	@$(MAKE) -rR showconfigs | sed 's,^,  ,'
 
+
+.PHONY: defconfig
+defconfig:
+	@$(MAKE) config T=$(shell \
+                uname -m | awk '{ \
+                if ($$0 == "aarch64") { \
+                        print "arm64-armv8a"} \
+                else if ($$0 == "armv7l") { \
+                        print "arm-armv7a"} \
+                else if ($$0 == "ppc64") { \
+                        print "ppc_64-power8"} \
+                else { \
+                        printf "%s-native", $$0} }')-$(shell \
+                uname | awk '{ \
+                if ($$0 == "Linux") { \
+                        print "linuxapp"} \
+                else { \
+                        print "bsdapp"} }')-$(shell \
+                ${CC} -v 2>&1 | \
+                grep " version " | cut -d ' ' -f 1)
+
 .PHONY: config
 ifeq ($(RTE_CONFIG_TEMPLATE),)
 config: notemplate
 else
 config: $(RTE_OUTPUT)/include/rte_config.h $(RTE_OUTPUT)/Makefile
-	@echo "Configuration done"
+	@echo "Configuration done using" \
+		$(patsubst defconfig_%,%,$(notdir $(RTE_CONFIG_TEMPLATE)))
 endif
 
 $(RTE_OUTPUT):
diff --git a/mk/rte.sdkroot.mk b/mk/rte.sdkroot.mk
index 2843b7de1e..e2e3effa84 100644
--- a/mk/rte.sdkroot.mk
+++ b/mk/rte.sdkroot.mk
@@ -88,8 +88,8 @@ export ROOTDIRS-y ROOTDIRS- ROOTDIRS-n
 .PHONY: default
 default: all
 
-.PHONY: config showconfigs showversion showversionum
-config showconfigs showversion showversionum:
+.PHONY: config defconfig showconfigs showversion showversionum
+config defconfig showconfigs showversion showversionum:
 	$(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkconfig.mk $@
 
 .PHONY: cscope gtags tags etags
-- 
2.20.1