Replace obsolete AC_TRY_COMPILE with AC_COMPILE_IFELSE

Autoconf made several macros obsolete including the AC_TRY_COMPILE in
2000 and since Autoconf 2.50:
http://git.savannah.gnu.org/cgit/autoconf.git/tree/ChangeLog.2

These macros should be replaced with the current AC_COMPILE_IFELSE
instead.

Refs:
- https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Obsolete-Macros.html
- https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/AC_005fACT_005fIFELSE-vs-AC_005fTRY_005fACT.html

1 files changed, 5 insertions, 5 deletions

diff --git a/m4/ax_cxx_have_koenig_lookup.m4 b/m4/ax_cxx_have_koenig_lookup.m4
index 3a4c767..77789f4 100644
--- a/m4/ax_cxx_have_koenig_lookup.m4
+++ b/m4/ax_cxx_have_koenig_lookup.m4
@@ -20,14 +20,14 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 8
+#serial 9
 
 AU_ALIAS([MNI_CXX_HAVE_KOENIG_LOOKUP], [AX_CXX_HAVE_KOENIG_LOOKUP])
 AC_DEFUN([AX_CXX_HAVE_KOENIG_LOOKUP],
     [AC_CACHE_CHECK(whether the compiler implements Koenig lookup,
                     ax_cv_cxx_have_koenig_lookup,
                     [AC_LANG_PUSH(C++)
-                     AC_TRY_COMPILE([
+                     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
     namespace N1 {
         class C {};
         void f1(const C& c) {}
@@ -40,9 +40,9 @@ AC_DEFUN([AX_CXX_HAVE_KOENIG_LOOKUP],
                        // otherwise this will fail to compile.
         }
     }
-    ],[],
-                     ax_cv_cxx_have_koenig_lookup=yes,
-                     ax_cv_cxx_have_koenig_lookup=no)
+    ]], [])],
+                    [ax_cv_cxx_have_koenig_lookup=yes],
+                    [ax_cv_cxx_have_koenig_lookup=no])
                      AC_LANG_POP])
     if test "$ax_cv_cxx_have_koenig_lookup" = yes; then
         AC_DEFINE(CXX_HAVE_KOENIG_LOOKUP,1,