Fix configure --disable-munmap handling

(fix commits d564f15, bfd8345)

* configure.ac (USE_MUNMAP, MUNMAP_THRESHOLD): Do not define if
enable_munmap is "no" (or a blank value).
* configure.ac [with_checksums=yes]: Do not report AC_MSG_ERROR if
enable_munmap is "no".

diff --git a/configure.ac b/configure.ac
index 7db6fbb..79ce080 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -882,7 +882,7 @@ AC_ARG_ENABLE(munmap,
     [AC_HELP_STRING([--enable-munmap=N],
         [return page to the os if empty for N collections])],
     MUNMAP_THRESHOLD=$enableval)
-if test "${enable_munmap}" != ""; then
+if test x$enable_munmap != x -a x$enable_munmap != xno; then
     AC_DEFINE([USE_MMAP], 1,
               [Define to use mmap instead of sbrk to expand the heap.])
     case "$host" in
@@ -915,7 +915,8 @@ AC_ARG_WITH([checksums],
                      substantial performance cost; use only for debugging
                      of the incremental collector])])
 if test x$with_checksums = xyes; then
-    if test x$enable_munmap != x -o x$THREADS != xnone; then
+    if test x$enable_munmap != x -a x$enable_munmap != xno \
+            -o x$THREADS != xnone; then
         AC_MSG_ERROR([CHECKSUMS not compatible with USE_MUNMAP or threads])
     fi
     AC_DEFINE([CHECKSUMS], 1,