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AC_DEFUN([AC_COMPILE_CHECK_SIZEOF],

[changequote(<<, >>)dnl

dnl The name to #define.

define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl

dnl The cache variable name.

define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl

changequote([, ])dnl

AC_MSG_CHECKING(size of $1)

AC_CACHE_VAL(AC_CV_NAME,

[for ac_size in 4 8 1 2 16 12 $2 ; do # List sizes in rough order of prevalence.

  AC_TRY_COMPILE([#include "confdefs.h"

#include <sys/types.h>

$2

], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)

  if test x$AC_CV_NAME != x ; then break; fi

done

])

if test x$AC_CV_NAME = x ; then

  AC_MSG_ERROR([cannot determine a size for $1])

fi

AC_MSG_RESULT($AC_CV_NAME)

AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])

undefine([AC_TYPE_NAME])dnl

undefine([AC_CV_NAME])dnl

])

AC_DEFUN([AC_C_BIGENDIAN_CROSS],

[AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,

[ac_cv_c_bigendian=unknown

# See if sys/param.h defines the BYTE_ORDER macro.

AC_TRY_COMPILE([#include <sys/types.h>

#include <sys/param.h>], [

#if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN

 bogus endian macros

#endif], [# It does; now see whether it defined to BIG_ENDIAN or not.

AC_TRY_COMPILE([#include <sys/types.h>

#include <sys/param.h>], [

#if BYTE_ORDER != BIG_ENDIAN

 not big endian

#endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])

if test $ac_cv_c_bigendian = unknown; then

AC_TRY_RUN([main () {

  /* Are we little or big endian?  From Harbison&Steele.  */

  union

  {

    long l;

    char c[sizeof (long)];

  } u;

  u.l = 1;

  exit (u.c[sizeof (long) - 1] == 1);

}], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes,

[ echo $ac_n "cross-compiling... " 2>&AC_FD_MSG ])

fi])

if test $ac_cv_c_bigendian = unknown; then

AC_MSG_CHECKING(to probe for byte ordering)

[

cat >conftest.c <<EOF

short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };

short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };

void _ascii() { char* s = (char*) ascii_mm; s = (char*) ascii_ii; }

short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };

short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };

void _ebcdic() { char* s = (char*) ebcdic_mm; s = (char*) ebcdic_ii; }

int main() { _ascii (); _ebcdic (); return 0; }

EOF

] if test -f conftest.c ; then

     if ${CC-cc} ${CFLAGS} -c conftest.c -o conftest.o && test -f conftest.o ; then

        if test `grep -l BIGenDianSyS conftest.o` ; then

           echo $ac_n ' big endian probe OK, ' 1>&AC_FD_MSG

           ac_cv_c_bigendian=yes

        fi

        if test `grep -l LiTTleEnDian conftest.o` ; then

           echo $ac_n ' little endian probe OK, ' 1>&AC_FD_MSG

           if test $ac_cv_c_bigendian = yes ; then

            ac_cv_c_bigendian=unknown;

           else

            ac_cv_c_bigendian=no

           fi

        fi

        echo $ac_n 'guessing bigendian ...  ' >&AC_FD_MSG

     fi

  fi

AC_MSG_RESULT($ac_cv_c_bigendian)

fi

if test $ac_cv_c_bigendian = yes; then

  AC_DEFINE(WORDS_BIGENDIAN, 1, [whether byteorder is bigendian])

  AC_DEFINE(HOST_WORDS_BIG_ENDIAN, 1,

  [Define if the host machine stores words of multi-word integers in

   big-endian order.])

  BYTEORDER=4321

else

  BYTEORDER=1234

fi

AC_DEFINE_UNQUOTED(BYTEORDER, $BYTEORDER, [1234 = LIL_ENDIAN, 4321 = BIGENDIAN])

if test $ac_cv_c_bigendian = unknown; then

  AC_MSG_ERROR([unknown endianess - sorry, please pre-set ac_cv_c_bigendian])

fi

])