mk: filter duplicate configuration entries

[dpdk.git] / mk / rte.sdkconfig.mk

diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
index 068d787..e93237f 100644 (file)
--- a/mk/rte.sdkconfig.mk
+++ b/mk/rte.sdkconfig.mk
@@ -79,11 +79,20 @@ $(RTE_OUTPUT):
 ifdef NODOTCONF
 $(RTE_OUTPUT)/.config: ;
 else
+# Generate config from template, if there are duplicates keep only the last.
+# To do so the temp config is checked for duplicate keys with cut/sort/uniq
+# Then for each of those identified duplicates as long as there are more than
+# just one left the last match is removed.
 $(RTE_OUTPUT)/.config: $(RTE_CONFIG_TEMPLATE) FORCE | $(RTE_OUTPUT)
        $(Q)if [ "$(RTE_CONFIG_TEMPLATE)" != "" -a -f "$(RTE_CONFIG_TEMPLATE)" ]; then \
                $(CPP) -undef -P -x assembler-with-cpp \
                -ffreestanding \
                -o $(RTE_OUTPUT)/.config_tmp $(RTE_CONFIG_TEMPLATE) ; \
+               for config in $$(grep -v "^#" $(RTE_OUTPUT)/.config_tmp | cut -d"=" -f1 | sort | uniq -d); do \
+                       while [ $$(grep "^$${config}=" $(RTE_OUTPUT)/.config_tmp -c ) -gt 1 ]; do \
+                               sed -i "0,/^$${config}=/{//d}" $(RTE_OUTPUT)/.config_tmp; \
+                       done; \
+               done; \
                if ! cmp -s $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config; then \
                        cp $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config ; \
                        cp $(RTE_OUTPUT)/.config_tmp $(RTE_OUTPUT)/.config.orig ; \