#
  # Sed script to parse CPP macros and generate output usable by make
  #
  # It is expected that this script is fed the output of 'gpp -dM'
  # which preprocesses the common.h header files and outputs the final
  # list of CPP macros (and whitespace is sanitized)
  #
  
  # Only process values prefixed with #define CONFIG_
  /^#define CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*/ {
  	# Strip the #define prefix
  	s/#define *//;
  	# Change to form CONFIG_*=VALUE
  	s/  */=/;
  	# Drop trailing spaces
  	s/ *$//;
  	# drop quotes around string values
  	s/="\(.*\)"$/=\1/;
  	# Concatenate string values
  	s/" *"//g;
  	# Assume strings as default - add quotes around values
  	s/=\(..*\)/="\1"/;
  	# but remove again from decimal numbers
  	s/="\([0-9][0-9]*\)"/=\1/;
  	# ... and from hex numbers
  	s/="\(0[Xx][0-9a-fA-F][0-9a-fA-F]*\)"/=\1/;
  	# ... and from configs defined from other configs
  	s/="\(CONFIG_[A-Za-z0-9_][A-Za-z0-9_]*\)"/=$(\1)/;
  	# Change '1' and empty values to "y" (not perfect, but
  	# supports conditional compilation in the makefiles
  	s/=$/=y/;
  	s/=1$/=y/;
  	# print the line
  	p
  }