39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
# pid_t.m4 serial 4
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dnl Copyright (C) 2020-2022 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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# The following implementation works around a problem in autoconf <= 2.69.
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m4_version_prereq([2.70], [], [
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dnl Define pid_t if the headers don't define it.
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AC_DEFUN([AC_TYPE_PID_T],
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[
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AC_CHECK_TYPE([pid_t],
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[],
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[dnl On 64-bit native Windows, define it to the equivalent of 'intptr_t'
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dnl (= 'long long' = '__int64'), because that is the return type
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dnl of the _spawnv* functions
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dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/spawnvp-wspawnvp>
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dnl and the argument type of the _cwait function
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dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/cwait>.
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dnl Otherwise (on 32-bit Windows and on old Unix platforms), define it
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dnl to 'int'.
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[
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#if defined _WIN64 && !defined __CYGWIN__
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LLP64
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#endif
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]])
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],
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[gl_pid_type='int'],
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[gl_pid_type='__int64'])
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AC_DEFINE_UNQUOTED([pid_t], [$gl_pid_type],
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[Define as a signed integer type capable of holding a process identifier.])
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],
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[AC_INCLUDES_DEFAULT])
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])
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])# m4_version_prereq 2.70
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