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Make PGAC_C_BUILTIN_OP_OVERFLOW link instead of just compiling.

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Otherwise the detection can spuriously detect symbol as available,
because the compiler may just emits reference to non-existant symbol.
This commit is contained in:
Andres Freund 2017-12-12 17:19:44 -08:00
parent 101c7ee3ee
commit 85abb5b297
2 changed files with 8 additions and 4 deletions
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5
config/c-compiler.m4
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@ -305,10 +305,11 @@ fi])# PGAC_C_BUILTIN_CONSTANT_P
# and define HAVE__BUILTIN_OP_OVERFLOW if so.
#
# Check for the most complicated case, 64 bit multiplication, as a
# proxy for all of the operations.
# proxy for all of the operations. Have to link to be sure to
# recognize a missing __builtin_mul_overflow.
AC_DEFUN([PGAC_C_BUILTIN_OP_OVERFLOW],
[AC_CACHE_CHECK(for __builtin_mul_overflow, pgac_cv__builtin_op_overflow,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[PG_INT64_TYPE result;
__builtin_mul_overflow((PG_INT64_TYPE) 1, (PG_INT64_TYPE) 2, &result);]
)],

7
configure vendored
View File

@ -14472,6 +14472,8 @@ esac
fi
# has to be down here, rather than with the other builtins, because
# the test uses PG_INT64_TYPE.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_mul_overflow" >&5
$as_echo_n "checking for __builtin_mul_overflow... " >&6; }
if ${pgac_cv__builtin_op_overflow+:} false; then :
@ -14490,12 +14492,13 @@ __builtin_mul_overflow((PG_INT64_TYPE) 1, (PG_INT64_TYPE) 2, &result);
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
if ac_fn_c_try_link "$LINENO"; then :
pgac_cv__builtin_op_overflow=yes
else
pgac_cv__builtin_op_overflow=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_op_overflow" >&5
$as_echo "$pgac_cv__builtin_op_overflow" >&6; }