| 1 | # minmax.m4 serial 4
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| 2 | dnl Copyright (C) 2005, 2009-2021 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 | ])
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