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+# minmax.m4 serial 4
+dnl Copyright (C) 2005, 2009-2022 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_PREREQ([2.53])
+
+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)
+dnl The parameter has to be a literal header name; it cannot be macro,
+dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
+dnl invocations with a literal macro name.)
+AC_DEFUN([gl_MINMAX_IN_HEADER],
+[
+ m4_pushdef([header], AS_TR_SH([$1]))
+ m4_pushdef([HEADER], AS_TR_CPP([$1]))
+ AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
+ [gl_cv_minmax_in_]header,
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM(
+ [[#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
+ m4_popdef([HEADER])
+ m4_popdef([header])
+])