39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
|
# pid_t.m4 serial 4
|
||
|
|
dnl Copyright (C) 2020-2023 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.
|
||
|
|
|
||
|
|
# The following implementation works around a problem in autoconf <= 2.69.
|
||
|
|
m4_version_prereq([2.70], [], [
|
||
|
|
|
||
|
|
dnl Define pid_t if the headers don't define it.
|
||
|
|
AC_DEFUN([AC_TYPE_PID_T],
|
||
|
|
[
|
||
|
|
AC_CHECK_TYPE([pid_t],
|
||
|
|
[],
|
||
|
|
[dnl On 64-bit native Windows, define it to the equivalent of 'intptr_t'
|
||
|
|
dnl (= 'long long' = '__int64'), because that is the return type
|
||
|
|
dnl of the _spawnv* functions
|
||
|
|
dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/spawnvp-wspawnvp>
|
||
|
|
dnl and the argument type of the _cwait function
|
||
|
|
dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/cwait>.
|
||
|
|
dnl Otherwise (on 32-bit Windows and on old Unix platforms), define it
|
||
|
|
dnl to 'int'.
|
||
|
|
AC_COMPILE_IFELSE(
|
||
|
|
[AC_LANG_PROGRAM([[
|
||
|
|
#if defined _WIN64 && !defined __CYGWIN__
|
||
|
|
LLP64
|
||
|
|
#endif
|
||
|
|
]])
|
||
|
|
],
|
||
|
|
[gl_pid_type='int'],
|
||
|
|
[gl_pid_type='__int64'])
|
||
|
|
AC_DEFINE_UNQUOTED([pid_t], [$gl_pid_type],
|
||
|
|
[Define as a signed integer type capable of holding a process identifier.])
|
||
|
|
],
|
||
|
|
[AC_INCLUDES_DEFAULT])
|
||
|
|
])
|
||
|
|
|
||
|
|
])# m4_version_prereq 2.70
|