commit d4a4b66a401d8988441dd663bf1664e11c045797
from: Russ Cox <rsc@swtch.com>
date: Tue May 19 01:41:35 2020 UTC

diff: rename class to fix AIX

math.h defines a function named class on AIX.

commit - 84167be4ad170c879db48493438f507c2d40d28d
commit + d4a4b66a401d8988441dd663bf1664e11c045797
blob - ed4d17b8e609b211d1c1b6ff57bbbce00dae048c
blob + 478c1b1b4066e5a8f75ca8157b2ed14a8cf9419d
--- src/cmd/diff/diffreg.c
+++ src/cmd/diff/diffreg.c
@@ -66,6 +66,9 @@
 *	3*(number of k-candidates installed),  typically about
 *	6n words for files of length n.
 */
+
+#define class diffclass
+
 /* TIDY THIS UP */
 struct cand {
 	int x;