From c6b2cc1263543e7b84a247c965d21f87c3b8feaf Mon Sep 17 00:00:00 2001
From: Martin Mares <mj@ucw.cz>
Date: Thu, 8 Feb 2007 23:04:56 +0100
Subject: [PATCH] More elegant evaluation of #if expressions.

---
 build/genconf | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/build/genconf b/build/genconf
index 29565a9c..ac9755f4 100755
--- a/build/genconf
+++ b/build/genconf
@@ -20,8 +20,11 @@ while (<CF>) {
 }
 close CF;
 
-my $opt_regex = join("|", keys %options);
-sub eval_expr { $_ = "@_"; s/\b($opt_regex)\b/ 1 /g if $opt_regex; s/\bCONFIG_\w+\b/ 0 /g; return eval $_; }
+sub eval_expr {
+	$_ = shift @_;
+	s/\b(CONFIG_\w+)\b/defined($options{$1}) ? 1 : 0/ge;
+	return eval $_;
+}
 
 open IN, $ARGV[0] or die "Unable to open $ARGV[0]";
 open OUT, ">$ARGV[1]" or die "Unable to create $ARGV[1]";
-- 
2.39.2