[Python-checkins] CVS: python/dist/src configure.in,1.135,1.136
Vladimir Marangozov
python-dev@python.org
2000年7月11日 22:04:47 -0700
Update of /cvsroot/python/python/dist/src
In directory slayer.i.sourceforge.net:/tmp/cvs-serv774
Modified Files:
configure.in
Log Message:
Second try: checks whether right shift extends the sign bit.
Adds caching and reverts back the 'return' to 'exit()' in
AC_TRY_RUN as recommended by the Autoconf documentation.
Index: configure.in
===================================================================
RCS file: /cvsroot/python/python/dist/src/configure.in,v
retrieving revision 1.135
retrieving revision 1.136
diff -C2 -r1.135 -r1.136
*** configure.in 2000年07月12日 03:02:16 1.135
--- configure.in 2000年07月12日 05:04:44 1.136
***************
*** 1140,1152 ****
# or fills with zeros (like the Cray J90, according to Tim Peters).
AC_MSG_CHECKING(whether right shift extends the sign bit)
AC_TRY_RUN([
int main()
{
! return ((-1)>>3 == -1) ? 1 : 0;
}
! ],
! [AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
! AC_MSG_RESULT(yes)],
! [AC_MSG_RESULT(no)])
# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!
--- 1140,1156 ----
# or fills with zeros (like the Cray J90, according to Tim Peters).
AC_MSG_CHECKING(whether right shift extends the sign bit)
+ AC_CACHE_VAL(ac_cv_rshift_extends_sign, [
AC_TRY_RUN([
int main()
{
! exit(((-1)>>3 == -1) ? 0 : 1);
}
! ], ac_cv_rshift_extends_sign=yes, ac_cv_rshift_extends_sign=no)])
! AC_MSG_RESULT($ac_cv_rshift_extends_sign)
! if test "$ac_cv_rshift_extends_sign" = no
! then
! AC_DEFINE(SIGNED_RIGHT_SHIFT_ZERO_FILLS)
! fi
!
# THIS MUST BE LAST, IT CAN BREAK OTHER TESTS!