[dpdk-dev] [PATCH v2 05/12] mk: introduce new install syntax

[Thomas Monjalon <thomas.monjalon@6wind.com>]

The old install command was:
	make install T=x86_64-native-linuxapp-gcc DESTDIR=install
It still works and can be replaced by these more standard commands:
	make config T=x86_64-native-linuxapp-gcc 0=x86_64-native-linuxapp-gcc
	make O=x86_64-native-linuxapp-gcc
	make install O=x86_64-native-linuxapp-gcc prefix= DESTDIR=install

It means the "make install" do not perform any compilation anymore when T
is not used. It is done only in pre_install to keep compatibility with the
old syntax based on T= option.

The default prefix /usr/local is empty in the T= case which is
used only for a local install.

Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>
---
 doc/build-sdk-quick.txt                          |  7 ++++---
 doc/guides/prog_guide/dev_kit_root_make_help.rst |  4 +---
 mk/rte.sdkinstall.mk                             | 12 ++++++++++++
 3 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/doc/build-sdk-quick.txt b/doc/build-sdk-quick.txt
index 662ef63..acd1bfe 100644
--- a/doc/build-sdk-quick.txt
+++ b/doc/build-sdk-quick.txt
@@ -5,7 +5,8 @@ Build commands
 	all              same as build (default rule)
 	build            build in a configured directory
 	clean            remove files but keep configuration
-	install          configure, build and install a target in DESTDIR
+	install T=       configure, build and install a target in DESTDIR
+	install          install optionally staged in DESTDIR
 	examples         build examples for given targets (T=)
 	examples_clean   clean examples for given targets (T=)
 Build variables
@@ -17,8 +18,8 @@ Build variables
 	CROSS     toolchain prefix
 	V         verbose
 	D         debug dependencies
-	O         build directory (default: build/ - install default: ./)
-	DESTDIR   second-stage install directory
+	O         build directory (default: build/ - install T= default: ./)
+	DESTDIR   staging install directory
 	prefix    root install directory
 	T         target template - used with config or install
 			format: <arch-machine-execenv-toolchain>
diff --git a/doc/guides/prog_guide/dev_kit_root_make_help.rst b/doc/guides/prog_guide/dev_kit_root_make_help.rst
index b0429d8..fb3520e 100644
--- a/doc/guides/prog_guide/dev_kit_root_make_help.rst
+++ b/doc/guides/prog_guide/dev_kit_root_make_help.rst
@@ -107,8 +107,6 @@ Install Targets
 
 *   Install
 
-    Build the DPDK binary.
-    The name of the target to install is specified using T=mytarget.
     The list of available targets are in $(RTE_SDK)/config (remove the defconfig\_ prefix).
 
     The GNU standards variables may be used:
@@ -119,7 +117,7 @@ Install Targets
 
     .. code-block:: console
 
-        make install T=x86_64-native-linuxapp-gcc prefix=/usr
+        make install DESTDIR=myinstall prefix=/usr
 
 Test Targets
 ------------
diff --git a/mk/rte.sdkinstall.mk b/mk/rte.sdkinstall.mk
index 4816998..6a7aedd 100644
--- a/mk/rte.sdkinstall.mk
+++ b/mk/rte.sdkinstall.mk
@@ -33,11 +33,21 @@
 # Configuration, compilation and installation can be done at once
 # with make install T=<config>
 
+ifdef T # config, build and install combined
 # The build directory is T and may be prepended with O
 O ?= .
 BUILD_DIR := $O/$T
+else # standard install
+# Build directory is given with O=
+O ?= build
+BUILD_DIR := $O
+endif
 
+ifdef T # defaults with T= will install an almost flat staging tree
+export prefix ?=
+else
 prefix      ?=     /usr/local
+endif
 exec_prefix ?=      $(prefix)
 bindir      ?= $(exec_prefix)/bin
 libdir      ?= $(exec_prefix)/lib
@@ -58,6 +68,7 @@ rte_symlink = ln -snf $$($(RTE_SDK)/scripts/relpath.sh $1 $(dir $2)) $2
 
 .PHONY: pre_install
 pre_install:
+ifdef T
 	$(Q)if [ ! -f $(BUILD_DIR)/.config ]; then \
 		$(MAKE) config T=$T O=$(BUILD_DIR); \
 	elif cmp -s $(BUILD_DIR)/.config.orig $(BUILD_DIR)/.config; then \
@@ -74,6 +85,7 @@ pre_install:
 		echo "Using local configuration"; \
 	fi
 	$(Q)$(MAKE) all O=$(BUILD_DIR)
+endif
 
 .PHONY: install
 install: pre_install
-- 
2.5.2