[dpdk-dev] [PATCH 2/2] examples/ethtool: enable build using pkg-config vars

[Bruce Richardson <bruce.richardson@intel.com>]

When provided as an example in a DPDK package, the build of the example
app should use the pkg-config-supplied values from the package. As with
other examples, set up makefile to allow compilation either using
pkg-config or old $RTE_SDK/$RTE_TARGET values.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 examples/ethtool/Makefile | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/examples/ethtool/Makefile b/examples/ethtool/Makefile
index 2b40b4b61..9ea7e0e07 100644
--- a/examples/ethtool/Makefile
+++ b/examples/ethtool/Makefile
@@ -1,6 +1,54 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2015 Intel Corporation
 
+# Build using pkg-config variables if possible
+$(shell pkg-config --exists libdpdk)
+ifeq ($(.SHELLSTATUS),0)
+
+# sample app consists of two parts, an example library and app using it
+APP := ethtool
+SRCS-y := ethtool-app/main.c ethtool-app/ethapp.c
+
+LIB := rte_ethtool
+LIB-SRC := rte_ethtool.c
+
+all: shared
+.PHONY: shared static
+shared: build/$(APP)-shared
+	ln -sf $(APP)-shared build/$(APP)
+static: build/$(APP)-static
+	ln -sf $(APP)-static build/$(APP)
+
+PC_FILE := $(shell pkg-config --path libdpdk)
+CFLAGS += -O3 $(shell pkg-config --cflags libdpdk)
+LDFLAGS_SHARED = $(shell pkg-config --libs libdpdk) -lrte_pmd_ixgbe
+LDFLAGS_STATIC = -Wl,-Bstatic $(shell pkg-config --static --libs libdpdk)
+
+LIB-OBJ := build/$(LIB-SRC:.c=.o)
+AR_FILE := build/lib$(LIB).a
+
+$(LIB-OBJ): lib/$(LIB-SRC) Makefile $(PC_FILE) | build
+	$(CC) -c $(CFLAGS) lib/$(LIB-SRC) -o $@
+
+$(AR_FILE): $(LIB-OBJ)
+	$(AR) r $@ $<
+
+build/$(APP)-shared: $(SRCS-y) $(AR_FILE) Makefile $(PC_FILE) | build
+	$(CC) -Ilib $(CFLAGS) $(SRCS-y) $(AR_FILE) -o $@ $(LDFLAGS) $(LDFLAGS_SHARED)
+
+build/$(APP)-static: $(SRCS-y) $(AR_FILE) Makefile $(PC_FILE) | build
+	$(CC) -Ilib $(CFLAGS) $(SRCS-y) $(AR_FILE) -o $@ $(LDFLAGS) $(LDFLAGS_STATIC)
+
+build:
+	@mkdir -p $@
+
+.PHONY: clean
+clean:
+	rm -f build/$(APP) build/$(APP)-static build/$(APP)-shared
+	rmdir --ignore-fail-on-non-empty build
+
+else
+
 ifeq ($(RTE_SDK),)
 $(error "Please define RTE_SDK environment variable")
 endif
@@ -21,3 +69,5 @@ endif
 DEPDIRS-ethtool-app := lib
 
 include $(RTE_SDK)/mk/rte.extsubdir.mk
+
+endif # no pkg-config for DPDK
-- 
2.14.3