DPDK 20.05 had some deprecation notes after "make config"
and after the build.
For DPDK 20.08, the config note is replaced with a warning
before the config and before the build.
After the warning, there is a pause which can be skipped
with the variable MAKE_PAUSE.

This deprecation process was discussed in the Technical Board:
http://mails.dpdk.org/archives/dev/2020-April/162839.html

Signed-off-by: Thomas Monjalon <tho...@monjalon.net>
---
 mk/rte.sdkconfig.mk |  5 -----
 mk/rte.sdkroot.mk   | 16 ++++++++++++++++
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
index 2ea85e4643..f538649f22 100644
--- a/mk/rte.sdkconfig.mk
+++ b/mk/rte.sdkconfig.mk
@@ -62,11 +62,6 @@ else
 config: $(RTE_OUTPUT)/include/rte_config.h $(RTE_OUTPUT)/Makefile
        @echo "Configuration done using" \
                $(patsubst defconfig_%,%,$(notdir $(RTE_CONFIG_TEMPLATE)))
-       @echo "==== NOTE ===="
-       @echo "It is recommended to build DPDK using 'meson' and 'ninja'"
-       @echo "See https://doc.dpdk.org/guides/linux_gsg/build_dpdk.html for 
instructions"
-       @echo "Building DPDK with 'make' will be deprecated in a future release"
-       @echo "=============="
 endif
 
 $(RTE_OUTPUT):
diff --git a/mk/rte.sdkroot.mk b/mk/rte.sdkroot.mk
index 4043a9d4e8..d3b9cdd048 100644
--- a/mk/rte.sdkroot.mk
+++ b/mk/rte.sdkroot.mk
@@ -60,7 +60,22 @@ export ROOTDIRS-y ROOTDIRS- ROOTDIRS-n
 .PHONY: default test-build
 default test-build: all
 
+.PHONY: warning
+warning:
+       @echo
+       @echo "=========================== WARNING ============================"
+       @echo "It is recommended to build DPDK using 'meson' and 'ninja'"
+       @echo "See https://doc.dpdk.org/guides/linux_gsg/build_dpdk.html";
+       @echo "Building DPDK with 'make' will be deprecated in a future release"
+       @echo "================================================================"
+       @echo
+       @test "$(MAKE_PAUSE)" = n || ( \
+       echo "This deprecation warning can be passed by adding MAKE_PAUSE=n"; \
+       echo "to 'make' command line or as an exported environment variable."; \
+       echo "Press enter to continue..."; read)
+
 .PHONY: config defconfig showconfigs showversion showversionum
+config: warning
 config defconfig showconfigs showversion showversionum:
        $(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkconfig.mk $@
 
@@ -96,4 +111,5 @@ examples examples_clean:
 # all other build targets
 %:
        $(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkconfig.mk checkconfig
+       $(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkroot.mk warning
        $(Q)$(MAKE) -f $(RTE_SDK)/mk/rte.sdkbuild.mk $@
-- 
2.26.2

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