AC_DEFUN([utrace_CC_m32], [dnl

AC_CACHE_CHECK([$CC option for 32-bit word size], utrace_cv_CC_m32, [dnl

save_CC="$CC"

utrace_cv_CC_m32=none

for ut_try in -m32 -m31; do

  [CC=`echo "$save_CC" | sed 's/ -m[36][241]//'`" $ut_try"]

  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[int foo (void) { return 1; }]])],

		    [utrace_cv_CC_m32=$ut_try])

  test x$utrace_cv_CC_m32 = xnone || break

done

CC="$save_CC"])])

AC_DEFUN([utrace_HOST64], [AC_REQUIRE([utrace_CC_m32])

AS_IF([test x$utrace_cv_CC_m32 != xnone], [dnl

AC_CACHE_CHECK([for 64-bit host], utrace_cv_host64, [dnl

AC_EGREP_CPP([@utrace_host64@], [#include <stdint.h>

#if (UINTPTR_MAX > 0xffffffffUL)

@utrace_host64@

#endif],

             utrace_cv_host64=yes, utrace_cv_host64=no)])

AS_IF([test $utrace_cv_host64 = no],

      [utrace_biarch=-m64 utrace_thisarch=$utrace_cv_CC_m32],

      [utrace_biarch=$utrace_cv_CC_m32 utrace_thisarch=-m64])

biarch_CC=`echo "$CC" | sed "s/ *${utrace_thisarch}//"`

biarch_CC="$biarch_CC $utrace_biarch"])])

AC_DEFUN([utrace_BIARCH], [AC_REQUIRE([utrace_HOST64])

utrace_biarch_forced=no

AC_ARG_WITH([biarch],

	    AC_HELP_STRING([--with-biarch],

			   [enable biarch tests despite build problems]),

	    [AS_IF([test "x$with_biarch" != xno], [utrace_biarch_forced=yes])])

AS_IF([test $utrace_biarch_forced = yes], [dnl

utrace_cv_cc_biarch=yes

AC_MSG_NOTICE([enabling biarch tests regardless using $biarch_CC])], [dnl

AS_IF([test x$utrace_cv_CC_m32 != xnone], [dnl

AC_CACHE_CHECK([whether $biarch_CC makes executables we can run],

	       utrace_cv_cc_biarch, [dnl

save_CC="$CC"

CC="$biarch_CC"

AC_RUN_IFELSE([AC_LANG_PROGRAM([], [])],

	      utrace_cv_cc_biarch=yes, utrace_cv_cc_biarch=no, utrace_cv_cc_biarch=no)

CC="$save_CC"])], [utrace_cv_cc_biarch=no])

AS_IF([test $utrace_cv_cc_biarch != yes], [dnl

AC_MSG_WARN([not running biarch tests, $biarch_CC does not work])])])

AM_CONDITIONAL(BIARCH, [test $utrace_cv_cc_biarch = yes])])