[2367] Move experimental resolver config code to the top of configure.ac

configure.ac

@@ -24,6 +24,19 @@ AC_CONFIG_MACRO_DIR([m4macros])
 # Checks for programs.
 AC_PROG_CXX
 
+build_experimental_resolver=no
+AC_ARG_ENABLE(experimental-resolver,
+  [AC_HELP_STRING([--enable-experimental-resolver],
+  [enable building of the experimental resolver [default=no]])],
+  [build_experimental_resolver=$enableval])
+AM_CONDITIONAL([BUILD_EXPERIMENTAL_RESOLVER], [test "$build_experimental_resolver" = "yes"])
+if test "$build_experimental_resolver" = "yes"; then
+   BUILD_EXPERIMENTAL_RESOLVER=yes
+else
+   BUILD_EXPERIMENTAL_RESOLVER=no
+fi
+AC_SUBST(BUILD_EXPERIMENTAL_RESOLVER)
+
 # Enable low-performing debugging facilities? This option optionally
 # enables some debugging aids that perform slowly and hence aren't built
 # by default.
@@ -1001,19 +1014,6 @@ if test "$BOOST_NUMERIC_CAST_WOULDFAIL" = "yes" -a X"$werror_ok" = X1 -a $CLANGP
     AC_MSG_ERROR([Failed to compile a required header file.  If you are using FreeBSD and Boost installed via ports, retry with specifying --without-werror.  See the ChangeLog entry for Trac no. 1991 for more details.])
 fi
 
-build_experimental_resolver=no
-AC_ARG_ENABLE(experimental-resolver,
-  [AC_HELP_STRING([--enable-experimental-resolver],
-  [enable building of the experimental resolver [default=no]])],
-  [build_experimental_resolver=$enableval])
-AM_CONDITIONAL([BUILD_EXPERIMENTAL_RESOLVER], [test "$build_experimental_resolver" = "yes"])
-if test "$build_experimental_resolver" = "yes"; then
-   BUILD_EXPERIMENTAL_RESOLVER=yes
-else
-   BUILD_EXPERIMENTAL_RESOLVER=no
-fi
-AC_SUBST(BUILD_EXPERIMENTAL_RESOLVER)
-
 use_shared_memory=yes
 AC_ARG_WITH(shared-memory,
     AC_HELP_STRING([--with-shared-memory],