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AC_DEFUN([ACX_64BIT],[
AC_ARG_ENABLE(
[64bit],
[AS_HELP_STRING([--enable-64bit],[enable 64-bit compiling @<:@disabled@:>@])],
[enable_64bit="${enableval}"],
[enable_64bit="no"])
if test "x$enable_64bit" = "xyes"
then
tmp_CFLAGS=$CFLAGS
CFLAGS="-m64"
AC_CACHE_CHECK([if we can compile in 64-bit mode], [acx_cv_prog_cc_64bit],[
acx_cv_prog_cc_64bit=no
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([],[return sizeof(void*) == 8 ? 0 : 1;])
], [
acx_cv_prog_cc_64bit=yes
])
])
if test "x$acx_cv_prog_cc_64bit" = xyes; then
AC_MSG_CHECKING([if we can run 64-bit programs])
AC_CACHE_VAL([acx_cv_sys_64bit],[
acx_cv_sys_64bit=no
AC_RUN_IFELSE([
AC_LANG_PROGRAM([],[return sizeof(void*) == 8 ? 0 : 1;])
], [
AC_MSG_RESULT(yes)
acx_cv_sys_64bit=yes
],[
AC_MSG_RESULT(no)
AC_MSG_ERROR([Don't know how to compile in 64-bit mode.])
CFLAGS=$tmp_CFLAGS
],[
AC_MSG_WARN([Cannot test, assuming 64-bit])
acx_cv_sys_64bit=yes
])
])
CXXFLAGS="-m64 $CXXFLAGS"
LDFLAGS="-m64 $LDFLAGS"
CFLAGS="-m64 $tmp_CFLAGS"
else
CFLAGS=$tmp_CFLAGS
fi
fi
])
|
