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Add configure test to see if the C compiler has gcc-style computed gotos.

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We'll need this for the upcoming patch to speed up expression evaluation.
Might as well push it now to see if it behaves sanely in the buildfarm.

Andres Freund

Discussion: https://postgr.es/m/20170320062511.hp5qeurtxrwsvfxr@alap3.anarazel.de
This commit is contained in:
Tom Lane
2017-03-20 13:35:21 -04:00
parent 14a72525d2
commit bc18126a6b
5 changed files with 65 additions and 0 deletions
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34
configure vendored
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@ -11531,6 +11531,40 @@ if test x"$pgac_cv__builtin_unreachable" = xyes ; then
$as_echo "#define HAVE__BUILTIN_UNREACHABLE 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for computed goto support" >&5
$as_echo_n "checking for computed goto support... " >&6; }
if ${pgac_cv_computed_goto+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
void *labeladdrs[] = {&&my_label};
goto *labeladdrs[0];
my_label:
return 1;
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_computed_goto=yes
else
pgac_cv_computed_goto=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_computed_goto" >&5
$as_echo "$pgac_cv_computed_goto" >&6; }
if test x"$pgac_cv_computed_goto" = xyes ; then
$as_echo "#define HAVE_COMPUTED_GOTO 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __VA_ARGS__" >&5
$as_echo_n "checking for __VA_ARGS__... " >&6; }