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Reported by Thomas Petazzoni. https://lists.gnu.org/archive/html/bug-bison/2019-08/msg00000.html * examples/c/reccalc/local.mk: Complete dependencies, including for earlier versions of Automake (for sake of our CI, on top of Ubuntu Xenial/Bionic, which feature only Automake 1.15). (%D%/scan.c %D%/scan.h): Upgrade to the full version provided in Automake's documentation.
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;
}