| 1 | # minmax.m4 serial 4
|
|---|
| 2 | dnl Copyright (C) 2005, 2009-2022 Free Software Foundation, Inc.
|
|---|
| 3 | dnl This file is free software; the Free Software Foundation
|
|---|
| 4 | dnl gives unlimited permission to copy and/or distribute it,
|
|---|
| 5 | dnl with or without modifications, as long as this notice is preserved.
|
|---|
| 6 |
|
|---|
| 7 | AC_PREREQ([2.53])
|
|---|
| 8 |
|
|---|
| 9 | AC_DEFUN([gl_MINMAX],
|
|---|
| 10 | [
|
|---|
| 11 | AC_REQUIRE([gl_PREREQ_MINMAX])
|
|---|
| 12 | ])
|
|---|
| 13 |
|
|---|
| 14 | # Prerequisites of lib/minmax.h.
|
|---|
| 15 | AC_DEFUN([gl_PREREQ_MINMAX],
|
|---|
| 16 | [
|
|---|
| 17 | gl_MINMAX_IN_HEADER([limits.h])
|
|---|
| 18 | gl_MINMAX_IN_HEADER([sys/param.h])
|
|---|
| 19 | ])
|
|---|
| 20 |
|
|---|
| 21 | dnl gl_MINMAX_IN_HEADER(HEADER)
|
|---|
| 22 | dnl The parameter has to be a literal header name; it cannot be macro,
|
|---|
| 23 | dnl nor a shell variable. (Because autoheader collects only AC_DEFINE
|
|---|
| 24 | dnl invocations with a literal macro name.)
|
|---|
| 25 | AC_DEFUN([gl_MINMAX_IN_HEADER],
|
|---|
| 26 | [
|
|---|
| 27 | m4_pushdef([header], AS_TR_SH([$1]))
|
|---|
| 28 | m4_pushdef([HEADER], AS_TR_CPP([$1]))
|
|---|
| 29 | AC_CACHE_CHECK([whether <$1> defines MIN and MAX],
|
|---|
| 30 | [gl_cv_minmax_in_]header,
|
|---|
| 31 | [AC_COMPILE_IFELSE(
|
|---|
| 32 | [AC_LANG_PROGRAM(
|
|---|
| 33 | [[#include <$1>
|
|---|
| 34 | int x = MIN (42, 17);]],
|
|---|
| 35 | [[]])],
|
|---|
| 36 | [gl_cv_minmax_in_]header[=yes],
|
|---|
| 37 | [gl_cv_minmax_in_]header[=no])])
|
|---|
| 38 | if test $gl_cv_minmax_in_[]header = yes; then
|
|---|
| 39 | AC_DEFINE([HAVE_MINMAX_IN_]HEADER, 1,
|
|---|
| 40 | [Define to 1 if <$1> defines the MIN and MAX macros.])
|
|---|
| 41 | fi
|
|---|
| 42 | m4_popdef([HEADER])
|
|---|
| 43 | m4_popdef([header])
|
|---|
| 44 | ])
|
|---|
