45 lines
1.3 KiB
Text
45 lines
1.3 KiB
Text
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# minmax.m4 serial 4
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dnl Copyright (C) 2005, 2009-2021 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_PREREQ([2.53])
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AC_DEFUN([gl_MINMAX],
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[
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AC_REQUIRE([gl_PREREQ_MINMAX])
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])
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# Prerequisites of lib/minmax.h.
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AC_DEFUN([gl_PREREQ_MINMAX],
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[
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gl_MINMAX_IN_HEADER([limits.h])
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gl_MINMAX_IN_HEADER([sys/param.h])
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])
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dnl gl_MINMAX_IN_HEADER(HEADER)
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dnl The parameter has to be a literal header name; it cannot be macro,
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dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
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dnl invocations with a literal macro name.)
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AC_DEFUN([gl_MINMAX_IN_HEADER],
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[
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m4_pushdef([header], AS_TR_SH([$1]))
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m4_pushdef([HEADER], AS_TR_CPP([$1]))
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AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
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[gl_cv_minmax_in_]header,
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <$1>
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int x = MIN (42, 17);]],
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[[]])],
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[gl_cv_minmax_in_]header[=yes],
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[gl_cv_minmax_in_]header[=no])])
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if test $gl_cv_minmax_in_[]header = yes; then
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AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
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[Define to 1 if <$1> defines the MIN and MAX macros.])
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fi
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m4_popdef([HEADER])
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m4_popdef([header])
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])
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