autoconf tests for the 'minmax' module.

diff --git a/m4/minmax.m4 b/m4/minmax.m4
new file mode 100644 (file)
index 0000000..6c6b72b
--- /dev/null
+++ b/m4/minmax.m4
@@ -0,0 +1,38 @@
+# minmax.m4 serial 1
+dnl Copyright (C) 2005 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+AC_DEFUN([gl_MINMAX],
+[
+  AC_REQUIRE([gl_PREREQ_MINMAX])
+])
+
+# Prerequisites of lib/minmax.h.
+AC_DEFUN([gl_PREREQ_MINMAX],
+[
+  gl_MINMAX_IN_HEADER([limits.h])
+  gl_MINMAX_IN_HEADER([sys/param.h])
+])
+
+dnl gl_MINMAX_IN_HEADER(HEADER)
+AC_DEFUN([gl_MINMAX_IN_HEADER],
+[
+  define([header],[translit([$1],[./-],
+                                 [___])])
+  define([HEADER],[translit([$1],[abcdefghijklmnopqrstuvwxyz./-],
+                                 [ABCDEFGHIJKLMNOPQRSTUVWXYZ___])])
+  AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
+    [gl_cv_minmax_in_]header,
+    [AC_TRY_COMPILE([#include <$1>
+int x = MIN (42, 17);], [],
+       [gl_cv_minmax_in_]header[=yes],
+       [gl_cv_minmax_in_]header[=no])])
+  if test $gl_cv_minmax_in_[]header = yes; then
+    AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
+      [Define to 1 if <$1> defines the MIN and MAX macros.])
+  fi
+  undefine([HEADER])
+  undefine([header])
+])