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73 lines
2.0 KiB
Plaintext
73 lines
2.0 KiB
Plaintext
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dnl $Id: vacopy.m4 719 2008-10-29 09:08:42Z mgrimm $
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dnl Check for means to copy variable argument lists. After this check,
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dnl va_copy will at least be defined to something working.
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dnl This requires stdarg.h, which is assumed to exist.
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dnl Copyright (c) 2008 Moritz Grimm <mgrimm@mrsserver.net>
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dnl
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dnl Permission to use, copy, modify, and distribute this software for any
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dnl purpose with or without fee is hereby granted, provided that the above
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dnl copyright notice and this permission notice appear in all copies.
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dnl
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dnl THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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dnl WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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dnl MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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dnl ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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dnl WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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dnl ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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dnl OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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dnl AX_FUNC_VA_COPY
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AC_DEFUN([AX_FUNC_VA_COPY],
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[
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AC_MSG_CHECKING([for means to copy variable argument lists])
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AC_CACHE_VAL([local_ac_cv_func_va_copy],
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[
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#include <stdarg.h>
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]],
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[[
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va_list ap, ap2;
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va_copy(ap2, ap);
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]])],
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[local_ac_cv_func_va_copy=va_copy],
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[AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#include <stdarg.h>
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]],
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[[
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va_list ap, ap2;
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__va_copy(ap2, ap);
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]])],
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[local_ac_cv_func_va_copy=__va_copy],
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[local_ac_cv_func_va_copy=memcpy]
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)]
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)
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])
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AH_TEMPLATE([va_copy],
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[Define vararg lists copy function if necessary.])
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case "${local_ac_cv_func_va_copy}" in
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va_copy)
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AC_MSG_RESULT([va_copy])
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;;
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__va_copy)
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AC_MSG_RESULT([__va_copy])
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AC_DEFINE([va_copy],
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[__va_copy])
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;;
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memcpy)
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AC_MSG_RESULT([memcpy])
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AC_DEFINE([va_copy(dst, src)],
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[memcpy(&(dst), &(src), sizeof(va_list))])
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;;
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*)
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dnl Cannot happen unless the cache value is corrupt.
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;;
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esac
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])
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