mirror of
https://gitlab.xiph.org/xiph/ezstream.git
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74 lines
2.0 KiB
Plaintext
74 lines
2.0 KiB
Plaintext
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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