[PATCH 06/19] configure: properly pass through MM_DEBUG

[Daniel Axtens]

I noticed that compiling with --enable-mm-debug didn't cause the
functions in #ifdef MM_DEBUG to be compiled in. Somehow the variable
wasn't actually being substituted into anything that was built.

Change configure.ac to do AC_SUBST(), and put a substitution into
config.h.in. This makes MM_DEBUG available to any file which includes
config.h.

Signed-off-by: Daniel Axtens <dja@axtens.net>
---
 config.h.in  | 3 +++
 configure.ac | 6 ++++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/config.h.in b/config.h.in
index 9e8f9911b183..8cf62616cad7 100644
--- a/config.h.in
+++ b/config.h.in
@@ -13,6 +13,9 @@
 #define DISK_CACHE_STATS @DISK_CACHE_STATS@
 #define BOOT_TIME_STATS @BOOT_TIME_STATS@
 
+/* Define to 1 to enable mm debugging */
+#define MM_DEBUG @MM_DEBUG@
+
 /* We don't need those.  */
 #define MINILZO_CFG_SKIP_LZO_PTR 1
 #define MINILZO_CFG_SKIP_LZO_UTIL 1
diff --git a/configure.ac b/configure.ac
index 8d1c81a7316e..889d07b3c1d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1511,9 +1511,11 @@ AC_ARG_ENABLE([mm-debug],
              AS_HELP_STRING([--enable-mm-debug],
                              [include memory manager debugging]))
 if test x$enable_mm_debug = xyes; then
-    AC_DEFINE([MM_DEBUG], [1],
-            [Define to 1 if you enable memory manager debugging.])
+    MM_DEBUG=1
+else
+    MM_DEBUG=0
 fi
+AC_SUBST([MM_DEBUG])
 
 AC_ARG_ENABLE([cache-stats],
              AS_HELP_STRING([--enable-cache-stats],
-- 
2.30.2