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Kirill Smelkov
cpython
Commits
58190047
Commit
58190047
authored
Jul 07, 2003
by
Martin v. Löwis
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Use -fno-strict-aliasing if available. Fixes #766696. Will backport to 2.2.
parent
ba03c45f
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2
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60 additions
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1 deletion
+60
-1
configure
configure
+44
-1
configure.in
configure.in
+16
-0
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configure
View file @
58190047
#! /bin/sh
# From configure.in Revision: 1.42
1
.
# From configure.in Revision: 1.42
2
.
# 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"
...
...
configure.in
View file @
58190047
...
...
@@ -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"
...
...
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