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+?RCS: $Id: d_built_clz.U 167 2013-05-08 17:58:00Z rmanfredi $
+?RCS: Copyright (c) 2012 Raphael Manfredi
+?RCS: You may redistribute only under the terms of the Artistic License,
+?RCS: as specified in the README file that comes with the distribution.
+?RCS: You may reuse parts of this distribution only within the terms of
+?RCS: that same Artistic License; a copy of which may be found at the root
+?RCS: of the source tree for dist 4.0.
+?MAKE:d_built_clz: Trylink cat
+?MAKE: -pick add $@ %<
+?S: This variable conditionally defines the HAS_BUILTIN_CLZ symbol, which
+?S: indicates to the C program that __builtin_clz is available to count
+?S: leading zeroes.
+?C: This symbol, if defined, indicates that the __builtin_clz routine is
+?C: available to count leading zeroes in a word.
+?H:#$d_built_clz HAS_BUILTIN_CLZ /**/
+?LINT:set d_built_clz
+: check for __builtin_clz
+$cat >try.c <<EOC
+int main(void)
+ static int ret;
+ ret |= __builtin_clz(127);
+ return ret ? 0 : 1;
+set d_built_clz
+eval $trylink