HCoop / hcoop / debian / openafs.git / blame
| Commit | Line | Data |
|---|---|---|
| 805e021f CE |
1 | dnl |
| 2 | dnl $Id$ | |
| 3 | dnl | |
| 4 | ||
| 5 | dnl check if this computer is little or big-endian | |
| 6 | dnl if we can figure it out at compile-time then don't define the cpp symbol | |
| 7 | dnl otherwise test for it and define it. also allow options for overriding | |
| 8 | dnl it when cross-compiling | |
| 9 | ||
| 10 | AC_DEFUN([OPENAFS_CHECK_BIGENDIAN], [ | |
| 11 | AC_ARG_ENABLE([bigendian], | |
| 12 | [AS_HELP_STRING([--enable-bigendian], [the target is big endian])], | |
| 13 | [openafs_cv_c_bigendian=yes]) | |
| 14 | AC_ARG_ENABLE([littleendian], | |
| 15 | [AS_HELP_STRING([--enable-littleendian], [the target is little endian])], | |
| 16 | [openafs_cv_c_bigendian=no]) | |
| 17 | ||
| 18 | AC_CACHE_CHECK(whether byte order is known at compile time, | |
| 19 | openafs_cv_c_bigendian_compile, | |
| 20 | [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ | |
| 21 | #include <sys/types.h> | |
| 22 | #include <sys/param.h>]], [[ | |
| 23 | #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN | |
| 24 | bogus endian macros | |
| 25 | #endif]])],[openafs_cv_c_bigendian_compile=yes],[openafs_cv_c_bigendian_compile=no])]) | |
| 26 | AC_CACHE_CHECK(whether byte ordering is bigendian, openafs_cv_c_bigendian,[ | |
| 27 | if test "$openafs_cv_c_bigendian_compile" = "yes"; then | |
| 28 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ | |
| 29 | #include <sys/types.h> | |
| 30 | #include <sys/param.h>]], [[ | |
| 31 | #if BYTE_ORDER != BIG_ENDIAN | |
| 32 | not big endian | |
| 33 | #endif]])],[openafs_cv_c_bigendian=yes],[openafs_cv_c_bigendian=no]) | |
| 34 | else | |
| 35 | AC_RUN_IFELSE([AC_LANG_SOURCE([[main () { | |
| 36 | /* Are we little or big endian? From Harbison&Steele. */ | |
| 37 | union | |
| 38 | { | |
| 39 | long l; | |
| 40 | char c[sizeof (long)]; | |
| 41 | } u; | |
| 42 | u.l = 1; | |
| 43 | exit (u.c[sizeof (long) - 1] == 1); | |
| 44 | }]])], | |
| 45 | [openafs_cv_c_bigendian=no], | |
| 46 | [openafs_cv_c_bigendian=yes], | |
| 47 | [AC_MSG_ERROR(specify either --enable-bigendian or --enable-littleendian)]) | |
| 48 | fi | |
| 49 | ]) | |
| 50 | if test "$openafs_cv_c_bigendian" = "yes"; then | |
| 51 | AC_DEFINE(AUTOCONF_FOUND_BIGENDIAN, 1, [define if target is big endian])dnl | |
| 52 | fi | |
| 53 | if test "$openafs_cv_c_bigendian_compile" = "yes"; then | |
| 54 | AC_DEFINE(ENDIANESS_IN_SYS_PARAM_H, 1, [define if sys/param.h defines the endiness])dnl | |
| 55 | fi | |
| 56 | ]) |