45 lines
2 KiB
Text
45 lines
2 KiB
Text
# posixver.m4
|
|
# serial 12
|
|
dnl Copyright (C) 2002-2006, 2009-2025 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.
|
|
dnl This file is offered as-is, without any warranty.
|
|
|
|
AC_DEFUN([gl_POSIXVER],
|
|
[
|
|
AC_REQUIRE([gl_DEFAULT_POSIX2_VERSION])
|
|
])
|
|
|
|
# Set the default level of POSIX conformance at configure-time.
|
|
# Build with './configure DEFAULT_POSIX2_VERSION=199209 ...' to
|
|
# support the older version, thus preserving portability with
|
|
# scripts that use sort +1, tail +32, etc.
|
|
# Note however, that this breaks tools that might run commands
|
|
# like 'sort +some-file' that conform with the newer standard.
|
|
AC_DEFUN([gl_DEFAULT_POSIX2_VERSION],
|
|
[
|
|
AC_MSG_CHECKING([for desired default level of POSIX conformance])
|
|
gl_default_posix2_version=none-specified
|
|
if test -n "$ac_cv_env_DEFAULT_POSIX2_VERSION_set"; then
|
|
gl_default_posix2_version=$ac_cv_env_DEFAULT_POSIX2_VERSION_value
|
|
AC_DEFINE_UNQUOTED([DEFAULT_POSIX2_VERSION],
|
|
$gl_default_posix2_version,
|
|
[Define the default level of POSIX conformance. The value is of
|
|
the form YYYYMM, specifying the year and month the standard was
|
|
adopted. If not defined here, it defaults to the value of
|
|
_POSIX2_VERSION in <unistd.h>. Define to 199209 to default to
|
|
POSIX 1003.2-1992, which makes standard programs like 'head',
|
|
'tail', and 'sort' accept obsolete options like '+10' and
|
|
'-10'. Define to 200112 to default to POSIX 1003.1-2001, which
|
|
makes these standard programs treat leading-'+' operands as
|
|
file names and require modern usages like '-n 10' instead of
|
|
'-10'. Whether defined here or not, the default can be
|
|
overridden at run time via the _POSIX2_VERSION environment
|
|
variable.])
|
|
fi
|
|
AC_MSG_RESULT([$gl_default_posix2_version])
|
|
AC_ARG_VAR(
|
|
[DEFAULT_POSIX2_VERSION],
|
|
[POSIX version to default to; see 'config.hin'.])
|
|
])
|