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# This file is part of GNU cpio
# Copyright (C) 2009 Free Software Foundation
#
# GNU cpio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU cpio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU cpio. If not, see <http://www.gnu.org/licenses/>.
# CPIO_PACKED_STRUCTS is based on code from ClamAV
AC_DEFUN([CPIO_PACKED_STRUCTS],[
dnl check for __attribute__((packed))
AC_MSG_CHECKING([for structure packing via __attribute__((packed))])
AC_CACHE_VAL(cpio_cv_have_attrib_packed,[
AC_TRY_COMPILE(,
[struct { int i __attribute__((packed)); } s; ],
[have_attrib_packed=yes],
[have_attrib_packed=no])
])
AC_MSG_RESULT($have_attrib_packed)
if test "$have_attrib_packed" = no; then
AC_MSG_CHECKING(for structure packing via pragma)
AC_CACHE_VAL(cpio_cv_have_pragma_pack,[
AC_TRY_RUN(CPIO_FLUSHLEFT([
int main(int argc, char **argv) {
#pragma pack(1)
struct { char c; long l; } s;
return sizeof(s)==sizeof(s.c)+sizeof(s.l) ? 0:1; } ]),
[have_pragma_pack=yes],
[have_pragma_pack=no])
])
AC_MSG_RESULT($have_pragma_pack)
if test "$have_pragma_pack" = yes; then
AC_DEFINE(HAVE_PRAGMA_PACK, 1, "pragma pack")
else
AC_MSG_CHECKING(for structure packing via hppa/hp-ux pragma)
AC_CACHE_VAL(cpio_cv_have_pragma_pack_hpux,[
AC_TRY_RUN(CPIO_FLUSHLEFT([
/* hppa/hp-ux wants pragma outside of function */
#pragma pack 1
struct { char c; long l; } s;
int main(int argc, char **argv) {
return sizeof(s)==sizeof(s.c)+sizeof(s.l) ? 0:1; } ]),
[have_pragma_pack_hpux=yes],
[have_pragma_pack_hpux=no])
])
AC_MSG_RESULT($have_pragma_pack_hpux)
AC_DEFINE(HAVE_PRAGMA_PACK_HPPA, 1, "pragma pack hppa/hp-ux style")
fi
fi
if test "${have_attrib_packed}${have_pragma_pack}$have_pragma_pack_hpux" = "nonono"; then
AC_MSG_ERROR(Need to know how to pack structures with this compiler)
fi
if test "$have_attrib_packed" = yes; then
AC_DEFINE(HAVE_ATTRIB_PACKED, 1, [attrib packed])
fi
])
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