configure.ac: handle undefined LEVEL1_DCACHE_LINESIZE

On some platforms (riscv64, s390x) this value is "undefined" as returned
from getconf. We also need to handle this to avoid using the string
"undefined" blindly in further #defines.

diff --git a/configure.ac b/configure.ac
index 9780991122e42b32eaa1e5b1f6ddcf222adce786..659ace078dacb2f4c096a951f190c3efb137c7cb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -2159,7 +2159,7 @@ fi
     AC_PATH_PROG(HAVE_GETCONF_CMD, getconf, "no")
     if test "$HAVE_GETCONF_CMD" != "no"; then
         CLS=$(getconf LEVEL1_DCACHE_LINESIZE)
-        if [test "$CLS" != "" && test "$CLS" != "0"]; then
+        if [test "$CLS" != "undefined" && test "$CLS" != "" && test "$CLS" != "0"]; then
             AC_DEFINE_UNQUOTED([CLS],[${CLS}],[L1 cache line size])
         else
             AC_DEFINE([CLS],[64],[L1 cache line size])