[PATCH v3 1/3] mk: add sensible default target with defconfig

[David Hunt <david.hunt@intel.com>]

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>
---
 mk/rte.sdkconfig.mk | 28 +++++++++++++++++++++++++---
 mk/rte.sdkroot.mk   |  4 ++--
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
index 1f2d6bd..fc03fe3 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 $(RTE_OUTPUT)/Makefile
-	@echo "Configuration done"
+	@echo "Configuration done using "$(shell basename \
+		$(RTE_CONFIG_TEMPLATE) | sed "s/defconfig_//g")
 endif
 
 $(RTE_OUTPUT):
diff --git a/mk/rte.sdkroot.mk b/mk/rte.sdkroot.mk
index 2843b7d..076a2d7 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: defconfig config showconfigs showversion showversionum
+defconfig config showconfigs showversion showversionum:
 	$(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkconfig.mk $@
 
 .PHONY: cscope gtags tags etags
-- 
2.7.4