kernel-source/config-subst

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#!/bin/sh
# Substitute CONFIG_ variables
awk '
function subst(force)
{
if (!done || force) {
if (has_value)
print symbol "=" value
else
print "# " symbol " is not set"
}
done=1
}
BEGIN { symbol = ARGV[1]
if (ARGC == 3) {
has_value=1
value = ARGV[2]
}
split("", ARGV)
}
match($0, "\\<" symbol "\\>") \
{ subst(1) ; next }
{ print }
END { subst(0) }
' "$@"