define2mk.sed

#
# 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/;
	# 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
}