-# Bison often leaks memory when its exit status is non-zero, so set
-# --leak-check=summary for Valgrind in that case.
-m4_pushdef([ORIGINAL_AT_CHECK], m4_defn([AT_CHECK]))
-m4_pushdef([AT_CHECK],
-[ORIGINAL_AT_CHECK(
- m4_if(m4_quote(m4_substr(m4_quote($1), 0, 5)), [bison],
- m4_if([$2], [0], [],
- [[VALGRIND_OPTS="$VALGRIND_OPTS --leak-check=summary --show-reachable=no"; export VALGRIND_OPTS; ]]))$@)])