makefile: detect if GCC is >= 4.3.0 before adding -Wno-array-bounds

GCC versions less than 4.3.0 had a compiler error because
the -Wno-array-bounds flag wasn't valid.

Signed-off-by: Steven Noonan <steven@uplinklabs.net>

1 files changed, 59 insertions, 0 deletions

diff --git a/crawl-ref/source/util/gcc-gte.pl b/crawl-ref/source/util/gcc-gte.pl
new file mode 100755
index 0000000000..cd74544d7f
--- /dev/null
+++ b/crawl-ref/source/util/gcc-gte.pl
@@ -0,0 +1,59 @@
+#!/usr/bin/perl
+#
+# Simple GCC version check
+#
+# I have a feeling this could be better-implemented, because
+# it seems like the regex results should be available in an
+# array (i.e $RESULT[1] == $1 or something), but whatever.
+# But for now, this works fine. - Steven
+#
+
+use strict;
+use warnings;
+
+my $gcc = $ARGV[0];
+my $min = $ARGV[1];
+
+if ( `which $gcc 2> /dev/null` ) {
+} else {
+	die "Can't detect GCC version ($gcc is missing?)\n";
+}
+
+my $local = `$gcc -dumpversion`;
+my $pattern = "([0-9]+).([0-9]+).([0-9]+)";
+
+if ($local =~ $pattern) {
+} else {
+	die "Version '$local' is malformed.\n";
+}
+
+my $local_major = $1;
+my $local_minor = $2;
+my $local_patch = $3;
+
+if ($min =~ $pattern) {
+} else {
+	die "Version '$min' is malformed.\n";
+}
+
+my $min_major = $1;
+my $min_minor = $2;
+my $min_patch = $3;
+
+if ($local_major < $min_major) {
+	print "No\n";
+	exit 0;
+}
+
+if ($local_minor < $min_minor) {
+	print "No\n";
+	exit 0;
+}
+
+if ($local_patch < $min_patch) {
+	print "No\n";
+	exit 0;
+}
+
+print "Yes\n";
+exit 0;