[Python-checkins] python/dist/src configure,1.411,1.412 configure.in,1.422,1.423

loewis@users.sourceforge.net loewis@users.sourceforge.net
Mon, 07 Jul 2003 14:26:21 -0700


Update of /cvsroot/python/python/dist/src
In directory sc8-pr-cvs1:/tmp/cvs-serv9361

Modified Files:
	configure configure.in 
Log Message:
Use -fno-strict-aliasing if available. Fixes #766696. Will backport to 2.2.


Index: configure
===================================================================
RCS file: /cvsroot/python/python/dist/src/configure,v
retrieving revision 1.411
retrieving revision 1.412
diff -C2 -d -r1.411 -r1.412
*** configure	6 Jul 2003 09:29:52 -0000	1.411
--- configure	7 Jul 2003 21:26:17 -0000	1.412
***************
*** 1,4 ****
  #! /bin/sh
! # From configure.in Revision: 1.421 .
  # Guess values for system-dependent variables and create Makefiles.
  # Generated by GNU Autoconf 2.53 for python 2.3.
--- 1,4 ----
  #! /bin/sh
! # From configure.in Revision: 1.422 .
  # Guess values for system-dependent variables and create Makefiles.
  # Generated by GNU Autoconf 2.53 for python 2.3.
***************
*** 3646,3649 ****
--- 3646,3692 ----
  case $GCC in
  yes)
+     # Python violates C99 rules, by casting between incompatible
+     # pointer types. GCC may generate bad code as a result of that,
+     # so use -fno-strict-aliasing if supported.
+     echo "$as_me:$LINENO: checking whether $CC accepts -fno-strict-aliasing" >&5
+ echo $ECHO_N "checking whether $CC accepts -fno-strict-aliasing... $ECHO_C" >&6
+      ac_save_cc="$CC"
+      CC="$CC -fno-strict-aliasing"
+      if test "$cross_compiling" = yes; then
+   ac_cv_no_strict_aliasing_ok=no
+ else
+   cat >conftest.$ac_ext <<_ACEOF
+ #line $LINENO "configure"
+ #include "confdefs.h"
+ int main() { return 0; }
+ _ACEOF
+ rm -f conftest$ac_exeext
+ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+   (eval $ac_link) 2>&5
+   ac_status=$?
+   echo "$as_me:$LINENO: \$? = $ac_status" >&5
+   (exit $ac_status); } && { ac_try='./conftest$ac_exeext'
+   { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+   (eval $ac_try) 2>&5
+   ac_status=$?
+   echo "$as_me:$LINENO: \$? = $ac_status" >&5
+   (exit $ac_status); }; }; then
+   ac_cv_no_strict_aliasing_ok=yes
+ else
+   echo "$as_me: program exited with status $ac_status" >&5
+ echo "$as_me: failed program was:" >&5
+ cat conftest.$ac_ext >&5
+ ( exit $ac_status )
+ ac_cv_no_strict_aliasing_ok=no
+ fi
+ rm -f core core.* *.core conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext
+ fi
+      CC="$ac_save_cc"
+     echo "$as_me:$LINENO: result: $ac_cv_no_strict_aliasing_ok" >&5
+ echo "${ECHO_T}$ac_cv_no_strict_aliasing_ok" >&6
+     if test $ac_cv_no_strict_aliasing_ok = yes
+     then
+       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
+     fi
      case $ac_sys_system in
  	SCO_SV*)

Index: configure.in
===================================================================
RCS file: /cvsroot/python/python/dist/src/configure.in,v
retrieving revision 1.422
retrieving revision 1.423
diff -C2 -d -r1.422 -r1.423
*** configure.in	6 Jul 2003 09:29:52 -0000	1.422
--- configure.in	7 Jul 2003 21:26:19 -0000	1.423
***************
*** 642,645 ****
--- 642,661 ----
  case $GCC in
  yes)
+     # Python violates C99 rules, by casting between incompatible
+     # pointer types. GCC may generate bad code as a result of that,
+     # so use -fno-strict-aliasing if supported.
+     AC_MSG_CHECKING(whether $CC accepts -fno-strict-aliasing)
+      ac_save_cc="$CC"
+      CC="$CC -fno-strict-aliasing"
+      AC_TRY_RUN([int main() { return 0; }],
+      ac_cv_no_strict_aliasing_ok=yes,
+      ac_cv_no_strict_aliasing_ok=no,
+      ac_cv_no_strict_aliasing_ok=no)
+      CC="$ac_save_cc"
+     AC_MSG_RESULT($ac_cv_no_strict_aliasing_ok)
+     if test $ac_cv_no_strict_aliasing_ok = yes
+     then
+       BASECFLAGS="$BASECFLAGS -fno-strict-aliasing"
+     fi
      case $ac_sys_system in
  	SCO_SV*)