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Issue #9203: Computed gotos are now enabled by default on supported

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compilers (which are detected by the configure script).  They can still
be disable selectively by specifying --without-computed-gotos.
This commit is contained in:
Antoine Pitrou 2010-08-13 21:15:58 +00:00
parent d835cf1c84
commit 042b128f58
5 changed files with 126 additions and 25 deletions
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79
configure vendored
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@ -1,5 +1,5 @@
#! /bin/sh
# From configure.in Revision: 82090 .
# From configure.in Revision: 83580 .
# Guess values for system-dependent variables and create Makefiles.
# Generated by GNU Autoconf 2.65 for python 3.2.
#
@ -1421,8 +1421,9 @@ Optional Packages:
--with-libm=STRING math library
--with-libc=STRING C library
--with-wide-unicode Use 4-byte Unicode characters (default is 2 bytes)
--with-computed-gotos Use computed gotos / threaded dispatch in evaluation
loop (not available on all compilers)
--with(out)-computed-gotos
Use computed gotos in evaluation loop (enabled by
default on supported compilers)
Some influential environment variables:
CC C compiler command
@ -1929,11 +1930,11 @@ else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
$ac_includes_default
enum { N = $2 / 2 - 1 };
int
main ()
{
static int test_array [1 - 2 * !(0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1))];
static int test_array [1 - 2 * !(enum { N = $2 / 2 - 1 };
0 < ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1))];
test_array [0] = 0
;
@ -1944,11 +1945,11 @@ if ac_fn_c_try_compile "$LINENO"; then :
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
$ac_includes_default
enum { N = $2 / 2 - 1 };
int
main ()
{
static int test_array [1 - 2 * !(($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)
static int test_array [1 - 2 * !(enum { N = $2 / 2 - 1 };
($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 1)
< ($ac_type) ((((($ac_type) 1 << N) << N) - 1) * 2 + 2))];
test_array [0] = 0
@ -9121,7 +9122,7 @@ fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_doc_strings" >&5
$as_echo "$with_doc_strings" >&6; }
# Check for Python-specific malloc support
# Check if eval loop should use timestamp counter profiling
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-tsc" >&5
$as_echo_n "checking for --with-tsc... " >&6; }
@ -13502,6 +13503,49 @@ $as_echo "#define HAVE_BROKEN_MBSTOWCS 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC supports computed gotos" >&5
$as_echo_n "checking whether $CC supports computed gotos... " >&6; }
if test "${ac_cv_computed_gotos+set}" = set; then :
$as_echo_n "(cached) " >&6
else
if test "$cross_compiling" = yes; then :
ac_cv_computed_gotos=no
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int main(int argc, char **argv)
{
static void *targets[1] = { &&LABEL1 };
goto LABEL2;
LABEL1:
return 0;
LABEL2:
goto *targets[0];
return 1;
}
_ACEOF
if ac_fn_c_try_run "$LINENO"; then :
ac_cv_computed_gotos=yes
else
ac_cv_computed_gotos=no
fi
rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
conftest.$ac_objext conftest.beam conftest.$ac_ext
fi
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_computed_gotos" >&5
$as_echo "$ac_cv_computed_gotos" >&6; }
if test "$ac_cv_computed_gotos" = yes
then
$as_echo "#define HAVE_COMPUTED_GOTOS 1" >>confdefs.h
fi
# Check for --with-computed-gotos
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for --with-computed-gotos" >&5
$as_echo_n "checking for --with-computed-gotos... " >&6; }
@ -13509,21 +13553,28 @@ $as_echo_n "checking for --with-computed-gotos... " >&6; }
# Check whether --with-computed-gotos was given.
if test "${with_computed_gotos+set}" = set; then :
withval=$with_computed_gotos;
if test "$withval" != no
if test "$withval" = yes
then
$as_echo "#define USE_COMPUTED_GOTOS 1" >>confdefs.h
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
$as_echo "yes" >&6; }
else { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
fi
else
if test "$withval" = no
then
$as_echo "#define USE_COMPUTED_GOTOS 0" >>confdefs.h
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
fi
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no value specified" >&5
$as_echo "no value specified" >&6; }
fi
@ -14086,8 +14137,8 @@ esac
cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
# Files that config.status was made for.
config_files="$ac_config_files"
config_headers="$ac_config_headers"
config_files="`echo $ac_config_files`"
config_headers="`echo $ac_config_headers`"
_ACEOF