make/lib/awk.mk

   1 ################################################################################
   2 # Desc:   Named functions for awk
   3 # Author: Ken Grimes
   4 # Date:   2016
   5 ################################################################################
   6 # This makefile consists of awk programs that may come in handy as an extension
   7 # to the basic lisp make capabilities without having to invoke guile
   8 ################################################################################
   9
  10 # AWK_REVERSE_SQUASH############################################################
  11 # The following awk program reverses the order of a list while also removing
  12 # duplicate entries.  The effect of this when run on the dependency tree is that
  13 # it will remove duplicates occurring in reverse order, allowing the most deeply
  14 # nested libraries to be built, and linked, first. #############################
  15 define AWK_REVERSE_SQUASH =
  16 awk \
  17 '
  18 { for(i=NF;i>0;i--)
  19     printf (!a[$$i]++) ? $$i FS : "";
  20   i=split("",a);
  21   print ""
  22 }
  23 '
  24 #/AWK_REVERSE_SQUASH############################################################
  25 endef