mirror of
https://gitlab.xiph.org/xiph/ezstream.git
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9acbffc2dd
There are a few benefits to this, but the main reason is consistency and me completely understanding what's going on. Regressions are not expected, but wouldn't surprise either ... this needs lots of testing. git-svn-id: https://svn.xiph.org/trunk/ezstream@15776 0101bb08-14d6-0310-b084-bc0e0c8e3800
73 lines
2.0 KiB
Plaintext
73 lines
2.0 KiB
Plaintext
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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