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annotate m4/minmax.m4 @ 17252:7a29ec33d6c5

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author Karl Berry <karl@freefriends.org>
date Tue, 01 Jan 2013 09:17:08 -0800
parents e542fd46ad6f
children 344018b6e5d7
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1 # minmax.m4 serial 4
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2 dnl Copyright (C) 2005, 2009-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
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4 dnl gives unlimited permission to copy and/or distribute it,
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 AC_PREREQ([2.53])
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8
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9 AC_DEFUN([gl_MINMAX],
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10 [
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11 AC_REQUIRE([gl_PREREQ_MINMAX])
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12 ])
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13
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14 # Prerequisites of lib/minmax.h.
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15 AC_DEFUN([gl_PREREQ_MINMAX],
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16 [
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17 gl_MINMAX_IN_HEADER([limits.h])
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18 gl_MINMAX_IN_HEADER([sys/param.h])
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19 ])
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20
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21 dnl gl_MINMAX_IN_HEADER(HEADER)
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22 dnl The parameter has to be a literal header name; it cannot be macro,
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23 dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
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24 dnl invocations with a literal macro name.)
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25 AC_DEFUN([gl_MINMAX_IN_HEADER],
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26 [
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27 m4_pushdef([header], AS_TR_SH([$1]))
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28 m4_pushdef([HEADER], AS_TR_CPP([$1]))
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29 AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
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30 [gl_cv_minmax_in_]header,
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31 [AC_COMPILE_IFELSE(
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32 [AC_LANG_PROGRAM(
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33 [[#include <$1>
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34 int x = MIN (42, 17);]],
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35 [[]])],
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36 [gl_cv_minmax_in_]header[=yes],
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37 [gl_cv_minmax_in_]header[=no])])
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38 if test $gl_cv_minmax_in_[]header = yes; then
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39 AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
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40 [Define to 1 if <$1> defines the MIN and MAX macros.])
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41 fi
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42 m4_popdef([HEADER])
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43 m4_popdef([header])
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44 ])