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.
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.