minmax.m4
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minmax.m4
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	# minmax.m4 serial 2
	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_PREREQ(2.52)

	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_SOURCE([[#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])
	])