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Add infrastructure for compile-time assertions about variable types.

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Currently, the macros only work with fairly recent gcc versions, but there
is room to expand them to other compilers that have comparable features.

Heavily revised and autoconfiscated version of a patch by Andres Freund.
This commit is contained in:
Tom Lane
2012-09-30 14:38:31 -04:00
parent 26fd82ddf1
commit ea473fb2de
6 changed files with 214 additions and 0 deletions
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119
configure vendored
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@ -15524,6 +15524,125 @@ cat >>confdefs.h <<\_ACEOF
_ACEOF
fi
fi
{ $as_echo "$as_me:$LINENO: checking for _Static_assert" >&5
$as_echo_n "checking for _Static_assert... " >&6; }
if test "${pgac_cv__static_assert+set}" = set; then
$as_echo_n "(cached) " >&6
else
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
({ _Static_assert(1, "foo"); })
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
(eval "$ac_link") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext && {
test "$cross_compiling" = yes ||
$as_test_x conftest$ac_exeext
}; then
pgac_cv__static_assert=yes
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
pgac_cv__static_assert=no
fi
rm -rf conftest.dSYM
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:$LINENO: result: $pgac_cv__static_assert" >&5
$as_echo "$pgac_cv__static_assert" >&6; }
if test x"$pgac_cv__static_assert" = xyes ; then
cat >>confdefs.h <<\_ACEOF
#define HAVE__STATIC_ASSERT 1
_ACEOF
fi
{ $as_echo "$as_me:$LINENO: checking for __builtin_types_compatible_p" >&5
$as_echo_n "checking for __builtin_types_compatible_p... " >&6; }
if test "${pgac_cv__types_compatible+set}" = set; then
$as_echo_n "(cached) " >&6
else
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
int x; static int y[__builtin_types_compatible_p(__typeof__(x), int)];
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
(eval "$ac_compile") 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
$as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest.$ac_objext; then
pgac_cv__types_compatible=yes
else
$as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
pgac_cv__types_compatible=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:$LINENO: result: $pgac_cv__types_compatible" >&5
$as_echo "$pgac_cv__types_compatible" >&6; }
if test x"$pgac_cv__types_compatible" = xyes ; then
cat >>confdefs.h <<\_ACEOF
#define HAVE__BUILTIN_TYPES_COMPATIBLE_P 1
_ACEOF
fi
{ $as_echo "$as_me:$LINENO: checking whether struct tm is in sys/time.h or time.h" >&5
$as_echo_n "checking whether struct tm is in sys/time.h or time.h... " >&6; }