5.20. byacc

An updated byacc package that fixes one bug is now available for Red Hat Enterprise Linux 6.
Berkeley Yacc (byacc) is a public domain look-ahead left-to-right (LALR) parser generator used by many programs during their build process.

Bug Fix

Byacc's maximum stack depth was reduced from 10000 to 500 between byacc releases. If deep enough else-if structures were present in source code being compiled with byacc, this could lead to out-of-memory conditions, resulting in YACC Stack Overflow and build failure. This updated release restores the maximum stack depth to its original value, 10000. Note: the underlying LR algorithm still imposes a hard limit on the number of parsable else-if statements. Restoring the maximum stack depth to its original value means source code with deep else-if structures that previously compiled against byacc will again do so.
All byacc users should upgrade to this updated package, which fixes this bug.