Makefile.shared
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 # Kamailio build system
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 #
 # shared functions 
 #
 #
 #
 
 escape_values=$(subst $$,\$$,$(subst ",\", $(1)))
 
 # generates echo "$(1)=escape($(1))"
 cfg_gen_var=echo "$(1)=$(call escape_values,$($(1)))"
 
 # similar to cfg_gen_var, but for FOO=1 var=$(FOO)
 # it would generate "echo var=$(FOO)" and not "echo var=1"
 cfg_gen_var2=echo "$(1)=$(call escape_values,$(value $(1)))"
 
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 # generate a var from itself concatenated with another one
 cfg_gen_var3=echo "$(1)=$(call escape_values,$(value $(1))) \$$($(2))"
 
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 # generates echo "$(1)=escape($(1)) >> $(2)"
 cfg_save_var=$(call cfg_gen_var,$(1)) >>$(2);
 # same as above but uses cfg_gen_var2
 cfg_save_var2=$(call cfg_gen_var2,$(1)) >>$(2);
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 # concatenate another var to first var
 cfg_save_var3=$(call cfg_gen_var3,$(1),$(2)) >>$(3);
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 # map function $(1) on variable list $($(2)) (the function is used with only
 # one arg)
 mapf1=$(foreach v,$($(2)),$(call $(1),$v))
 # map function $(1) on variable list $($(2)), passing also $(3) as second
 # arg
 mapf2=$(foreach v,$($(2)),$(call $(1),$v,$(3)))
 
 
 #cfg_fixed_to_file=$(call mapf2,cfg_save_var,saved_fixed_vars,$(1))
 #cfg_chg_to_file=$(call mapf2,cfg_save_var2,saved_chg_vars,$(1))
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 ifeq (${err_fail},1)
 sh_err_fail=set -e;
 try_err=$(1) ; if [ $$? != 0 ]; then echo ERROR: $(1) failed ;  exit 1 ; fi
 else
 sh_err_fail=
 try_err=$(1) ; if [ $$? != 0 ]; then echo ERROR: $(1) failed ; fi
 endif
 
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 DOCBOOK = $(shell which docbook2x-man 2>/dev/null)
 ifeq ($(DOCBOOK),)
 	DOCBOOK = $(shell which db2x_docbook2man 2>/dev/null)
 endif