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%language is no longer an experimental feature. Experimental exception safety was introduced. Compiler warnings from Bison-generated parsers are now fully avoided. The formats of error messages and reports was slightly modified. Various minor bugs were fixed.
Some portability problems as well as some failures in the test suite were resolved. Detection of GNU M4 1.4.6 or newer during configure was improved. %code is now a permanent feature. YYFAIL is deprecated and pending removal. Bison now obeys "-Werror" and "--warnings=error" for warnings about grammar rules that are useless in the parser due to conflicts. Several other minor changes were made and bugs were fixed.
Several new directives were added. GLR grammars
now support locations. %token numbers can now be
hexadecimal integers. A POSIX conformant yacc
command and -ly library installation can now be
disabled at build. Numbers are no longer
arbitrarily limited to 16-bit counts. Semicolons
are now allowed before "|" in grammar rules, as
POSIX requires. Bison-generated parsers no longer
default to using the alloca function to extend the
parser stack. Furthermore, there have been
incompatible changes to error token location,
semicolon handling, and NUL byte and newline
handling.
