1) Add --with-distcache to configure for choosing

the distcache installation directory.

2) Use correct build variable MOD_SOCACHE_DC_LDADD
instead of MOD_SOCACHE_LDADD in build macro.

Also made the macro a bit more consistent with the
SSL checking macro.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1142648 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 79 insertions, 23 deletions

diff --git a/modules/cache/config.m4 b/modules/cache/config.m4
index b70ec42332..6f742dd75f 100644
--- a/modules/cache/config.m4
+++ b/modules/cache/config.m4
@@ -25,47 +25,103 @@ esac
 APACHE_MODULE(cache, dynamic file caching.  At least one storage management module (e.g. mod_cache_disk) is also necessary., $cache_objs, , most)
 APACHE_MODULE(cache_disk, disk caching module, $cache_disk_objs, , most)
 
-AC_DEFUN([CHECK_DISTCACHE], [
-  AC_CHECK_HEADER(
-    [distcache/dc_client.h],
-    [have_distcache=yes],
-    [have_distcache=no])
-  if test "$have_distcache" = "yes"; then
-    AC_MSG_CHECKING(for Distcache version)
-    AC_TRY_COMPILE(
-[#include <distcache/dc_client.h>],
-[#if DISTCACHE_CLIENT_API != 0x0001
+dnl
+dnl APACHE_CHECK_DISTCACHE
+dnl
+dnl Configure for the detected distcache installation, giving
+dnl preference to "--with-distcache=<path>" if it was specified.
+dnl
+AC_DEFUN(APACHE_CHECK_DISTCACHE,[
+if test "x$ap_distcache_configured" = "x"; then
+  dnl initialise the variables we use
+  ap_distcache_found=""
+  ap_distcache_base=""
+  ap_distcache_libs=""
+  ap_distcache_ldflags=""
+
+  dnl Determine the distcache base directory, if any
+  AC_MSG_CHECKING([for user-provided distcache base])
+  AC_ARG_WITH(distcache, APACHE_HELP_STRING(--with-distcache=DIR, Distcache installation directory), [
+    dnl If --with-distcache specifies a directory, we use that directory or fail
+    if test "x$withval" != "xyes" -a "x$withval" != "x"; then
+      dnl This ensures $withval is actually a directory and that it is absolute
+      ap_distcache_base="`cd $withval ; pwd`"
+    fi
+  ])
+  if test "x$ap_distcache_base" = "x"; then
+    AC_MSG_RESULT(none)
+  else
+    AC_MSG_RESULT($ap_distcache_base)
+  fi
+
+  dnl Run header and version checks
+  saved_CPPFLAGS="$CPPFLAGS"
+  saved_LIBS="$LIBS"
+  saved_LDFLAGS="$LDFLAGS"
+
+  if test "x$ap_distcache_base" != "x"; then
+    APR_ADDTO(CPPFLAGS, [-I$ap_distcache_base/include])
+    APR_ADDTO(INCLUDES, [-I$ap_distcache_base/include])
+    APR_ADDTO(LDFLAGS, [-L$ap_distcache_base/lib])
+    APR_ADDTO(ap_distcache_ldflags, [-L$ap_distcache_base/lib])
+    if test "x$ap_platform_runtime_link_flag" != "x"; then
+      APR_ADDTO(LDFLAGS, [$ap_platform_runtime_link_flag$ap_distcache_base/lib])
+      APR_ADDTO(ap_distcache_ldflags, [$ap_platform_runtime_link_flag$ap_distcache_base/lib])
+    fi
+  fi
+  dnl First check for mandatory headers
+  AC_CHECK_HEADERS([distcache/dc_client.h], [ap_distcache_found="yes"], [])
+  if test "$ap_distcache_found" = "yes"; then
+    dnl test for a good version
+    AC_MSG_CHECKING(for distcache version)
+    AC_TRY_COMPILE([#include <distcache/dc_client.h>],[
+#if DISTCACHE_CLIENT_API != 0x0001
 #error "distcache API version is unrecognised"
 #endif],
-[],
-[have_distcache=no])
-    AC_MSG_RESULT($have_distcache)
+    [],
+    [ap_distcache_found="no"])
+  AC_MSG_RESULT($ap_distcache_found)
   fi
-  if test "$have_distcache" = "yes"; then
-    AC_MSG_CHECKING(for Distcache libraries)
-    save_libs=$LIBS
-    LIBS="$LIBS -ldistcache -lnal"
+  if test "$ap_distcache_found" != "yes"; then
+    AC_MSG_ERROR([...No distcache detected])
+  else
+    dnl Run library and function checks
+    AC_MSG_CHECKING(for distcache libraries)
+    ap_distcache_libs="-ldistcache -lnal"
+    APR_ADDTO(LIBS, [$ap_distcache_libs])
+
     AC_TRY_LINK(
       [#include <distcache/dc_client.h>],
       [DC_CTX *foo = DC_CTX_new((const char *)0,0);],
       [],
-      [have_distcache=no])
-    LIBS=$save_libs
-    AC_MSG_RESULT($have_distcache)
+      [ap_distcache_found="no"])
+    AC_MSG_RESULT($ap_distcache_found)
+    if test "$ap_distcache_found" != "yes"; then
+      AC_MSG_ERROR([... Error, distcache libraries were missing or unusable])
+    fi
   fi
-  if test "$have_distcache" = "yes"; then
-    APR_ADDTO(MOD_SOCACHE_LDADD, [-ldistcache -lnal])
+
+  dnl restore
+  CPPFLAGS="$saved_CPPFLAGS"
+  LIBS="$saved_LIBS"
+  LDFLAGS="$saved_LDFLAGS"
+
+  dnl Adjust apache's configuration based on what we found above.
+  if test "$ap_distcache_found" = "yes"; then
+    APR_ADDTO(MOD_SOCACHE_DC_LDADD, [$ap_distcache_ldflags $ap_distcache_libs])
     AC_DEFINE(HAVE_DISTCACHE, 1, [Define if distcache support is enabled])
   else
     enable_socache_dc=no
   fi
+  ap_distcache_configured="yes"
+fi
 ])
 
 APACHE_MODULE(socache_shmcb,  shmcb small object cache provider, , , most)
 APACHE_MODULE(socache_dbm, dbm small object cache provider, , , most)
 APACHE_MODULE(socache_memcache, memcache small object cache provider, , , most)
 APACHE_MODULE(socache_dc, distcache small object cache provider, , , no, [
-   CHECK_DISTCACHE
+    APACHE_CHECK_DISTCACHE
 ])
 
 APR_ADDTO(INCLUDES, [-I\$(top_srcdir)/$modpath_current])