[dpdk-dev] [PATCH] External app builds need to locate common make fragments and includes.

[Keith Wiles <keith.wiles@intel.com>]

When building an external application like Pktgen and using the proper
makefile fragments rte.extXYZ.mk NOT rte.XYZ.mk files as you would
use with example applications in the same RTE_SDK directory the rte.extXYZ.mk
files are missing some defines/includes.

  1 - Add missing tests for RTE_SDK/RTE_TARGET not defined code.
  2 - The build of external applications are forced to be verbose ouput
      as the Q=@ define is not present.
  3 - Missing include of target/generic/rte.vars.mk file which includes
      the information to locate the rte_config.h and other DPDK include
      files.

A patch like this one was submitted before and was rejected because it
seemed it was not required, because target/generic/rte.vars.mk already
included by rte.vars.mk.

This is not the cause for external applications like Pktgen which are
built outside of the RTE_SDK directory and only include the rte.extXYZ.mk
makefile fragments.

Signed-off-by: Keith Wiles <keith.wiles@intel.com>
---
 mk/rte.extvars.mk | 36 ++++++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/mk/rte.extvars.mk b/mk/rte.extvars.mk
index 3e5a990..e6c6401 100644
--- a/mk/rte.extvars.mk
+++ b/mk/rte.extvars.mk
@@ -30,8 +30,19 @@
 #   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #
-# directory where sources are located
+# To be included at the beginning of all RTE external user Makefiles. This
+# .mk will define the RTE environment variables by including the
+# config file of SDK. It also includes the config file from external
+# application if any.
 #
+
+ifeq ($(RTE_SDK),)
+$(error RTE_SDK is not defined)
+endif
+ifeq ($(wildcard $(RTE_SDK)),)
+$(error RTE_SDK variable points to an invalid location)
+endif
+
 ifdef S
 ifeq ("$(origin S)", "command line")
 RTE_SRCDIR := $(abspath $(S))
@@ -40,6 +51,16 @@ endif
 RTE_SRCDIR  ?= $(CURDIR)
 export RTE_SRCDIR
 
+# define Q to '@' or not. $(Q) is used to prefix all shell commands to
+# be executed silently.
+Q=@
+ifdef V
+ifeq ("$(origin V)", "command line")
+Q=
+endif
+endif
+export Q
+
 #
 # Makefile to call once $(RTE_OUTPUT) is created
 #
@@ -51,6 +72,13 @@ endif
 RTE_EXTMK ?= $(RTE_SRCDIR)/Makefile
 export RTE_EXTMK
 
+# RTE_TARGET is deducted from config when we are building the SDK.
+# Else, when building an external app, RTE_TARGET must be specified
+# by the user.
+ifeq ($(RTE_TARGET),)
+$(error RTE_TARGET is not defined)
+endif
+
 RTE_SDK_BIN := $(RTE_SDK)/$(RTE_TARGET)
 
 #
@@ -78,4 +106,8 @@ RTE_MACHINE := $(CONFIG_RTE_MACHINE:"%"=%)
 RTE_EXEC_ENV := $(CONFIG_RTE_EXEC_ENV:"%"=%)
 RTE_TOOLCHAIN := $(CONFIG_RTE_TOOLCHAIN:"%"=%)
 
-
+ifneq ($(wildcard $(RTE_SDK)/mk/target/$(RTE_TARGET)/rte.vars.mk),)
+include $(RTE_SDK)/mk/target/$(RTE_TARGET)/rte.vars.mk
+else
+include $(RTE_SDK)/mk/target/generic/rte.vars.mk
+endif
-- 
2.3.0