| 1 | dnl
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| 2 | dnl $Id$
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| 3 | dnl
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| 4 |
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| 5 | dnl check if this computer is little or big-endian
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| 6 | dnl if we can figure it out at compile-time then don't define the cpp symbol
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| 7 | dnl otherwise test for it and define it. also allow options for overriding
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| 8 | dnl it when cross-compiling
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| 9 |
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| 10 | AC_DEFUN([KRB_C_BIGENDIAN], [
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| 11 | AC_ARG_ENABLE(bigendian,
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| 12 | AS_HELP_STRING([--enable-bigendian],[the target is big endian]),
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| 13 | krb_cv_c_bigendian=yes)
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| 14 | AC_ARG_ENABLE(littleendian,
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| 15 | AS_HELP_STRING([--enable-littleendian],[the target is little endian]),
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| 16 | krb_cv_c_bigendian=no)
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| 17 | AC_CACHE_CHECK([whether byte order is known at compile time],
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| 18 | krb_cv_c_bigendian_compile,
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| 19 | [AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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| 20 | #include <sys/types.h>
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| 21 | #include <sys/param.h>
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| 22 | #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
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| 23 | bogus endian macros
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| 24 | #endif]])],[krb_cv_c_bigendian_compile=yes],[krb_cv_c_bigendian_compile=no])])
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| 25 | AC_CACHE_CHECK(whether byte ordering is bigendian, krb_cv_c_bigendian,[
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| 26 | if test "$krb_cv_c_bigendian_compile" = "yes"; then
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| 27 | AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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| 28 | #include <sys/types.h>
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| 29 | #include <sys/param.h>
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| 30 | #if BYTE_ORDER != BIG_ENDIAN
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| 31 | not big endian
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| 32 | #endif]])],[krb_cv_c_bigendian=yes],[krb_cv_c_bigendian=no])
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| 33 | else
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| 34 | AC_RUN_IFELSE([AC_LANG_SOURCE([[main (int argc, char **argv) {
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| 35 | /* Are we little or big endian? From Harbison&Steele. */
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| 36 | union
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| 37 | {
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| 38 | long l;
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| 39 | char c[sizeof (long)];
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| 40 | } u;
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| 41 | u.l = 1;
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| 42 | exit (u.c[sizeof (long) - 1] == 1);
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| 43 | }]])],[krb_cv_c_bigendian=no],[krb_cv_c_bigendian=yes],
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| 44 | [AC_MSG_ERROR([specify either --enable-bigendian or --enable-littleendian])])
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| 45 | fi
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| 46 | ])
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| 47 | if test "$krb_cv_c_bigendian" = "yes"; then
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| 48 | AC_DEFINE(WORDS_BIGENDIAN, 1, [define if target is big endian])dnl
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| 49 | fi
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| 50 | if test "$krb_cv_c_bigendian_compile" = "yes"; then
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| 51 | AC_DEFINE(ENDIANESS_IN_SYS_PARAM_H, 1, [define if sys/param.h defines the endiness])dnl
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| 52 | fi
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| 53 | AH_BOTTOM([
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| 54 | #ifdef ENDIANESS_IN_SYS_PARAM_H
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| 55 | # include <sys/types.h>
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| 56 | # include <sys/param.h>
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| 57 | # if BYTE_ORDER == BIG_ENDIAN
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| 58 | # define WORDS_BIGENDIAN 1
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| 59 | # endif
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| 60 | #endif
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| 61 | ])
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| 62 | ])
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