39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
# ssize_t.m4
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# serial 6
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dnl Copyright (C) 2001-2003, 2006, 2010-2024 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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dnl From Bruno Haible.
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dnl Define ssize_t if it does not already exist.
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AC_DEFUN([gt_TYPE_SSIZE_T],
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[
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AC_CACHE_CHECK([for ssize_t], [gl_cv_ssize_t],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <sys/types.h>]],
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[[int x = sizeof (ssize_t *) + sizeof (ssize_t);
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return !x;]])],
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[gl_cv_ssize_t=yes], [gl_cv_ssize_t=no])])
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if test $gl_cv_ssize_t = no; then
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dnl On 64-bit native Windows, ssize_t needs to be defined as 'long long',
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dnl for consistency with the 64-bit size_t.
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AC_CACHE_CHECK([whether size_t is wider than 'long'], [gl_cv_size_t_large],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <sys/types.h>
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typedef int array [2 * (sizeof (size_t) > sizeof (long)) - 1];
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]])],
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[gl_cv_size_t_large=yes], [gl_cv_size_t_large=no])])
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if test $gl_cv_size_t_large = yes; then
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gl_def_ssize_t='long long'
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else
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gl_def_ssize_t='long'
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fi
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AC_DEFINE_UNQUOTED([ssize_t], [$gl_def_ssize_t],
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[Define as a signed type of the same size as size_t.])
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fi
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])
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