diff options
| -rwxr-xr-x | configure | 45 | ||||
| -rw-r--r-- | configure.in | 16 |
2 files changed, 60 insertions, 1 deletions
@@ -1,5 +1,5 @@ #! /bin/sh -# From configure.in Revision: 1.421 . +# 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. # @@ -3645,6 +3645,49 @@ fi # tweak BASECFLAGS based on compiler and platform 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 $ac_sys_system in SCO_SV*) BASECFLAGS="$BASECFLAGS -m486 -DSCO5" diff --git a/configure.in b/configure.in index 8ab79b5..210eab3 100644 --- a/configure.in +++ b/configure.in @@ -641,6 +641,22 @@ AC_SUBST(BASECFLAGS) # tweak BASECFLAGS based on compiler and platform 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 $ac_sys_system in SCO_SV*) BASECFLAGS="$BASECFLAGS -m486 -DSCO5" |