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3f25104caf
It works only in implicit rules (or with GNU Make, but not with Solaris Make). Reported by Bruno Haible. http://lists.gnu.org/archive/html/bug-bison/2019-05/msg00009.html Diagnosed thanks to Kiyoshi Kanazawa. * examples/c/reccalc/local.mk, examples/d/local.mk, * examples/java/local.mk: Don't use $< in non implicit rules.
reccalc - recursive calculator with Flex and Bison
In this example the generated parser is pure and reentrant: it can be used concurrently in different threads, or recursively. As a proof of this reentrancy, expressions in parenthesis are tokenized as strings, and then recursively parsed from the parser:
exp: STR
{
result r = parse_string ($1);
free ($1);
if (r.nerrs)
{
res->nerrs += r.nerrs;
YYERROR;
}
else
$$ = r.value;
}