The --no-generation-date flag is a common re2c flag used in all re2c
invocations. This adds the 2nd optional argument to PHP_PROG_RE2C M4
macro in BC manner to set the default re2c command-line options and sets
the default RE2C_FLAGS similarly on Windows.
To prevent build failures like:
make: *** No rule to make target '/code/master/ext/json/php_json_scanner_defs.h', needed by 'ext/json/json_scanner.lo'. Stop.
The annotation %empty is properly enforced: warnings when it's
missing, and errors when it's inappropriate. Support for %empty was
introduced in Bison 3.0.
Pass -Wempty-rule to Bison.
Closes GH-5134
The parser files for ext/json are generated by bison from the *.y file.
Parser files in Zend and sapi/phpdbg already follow such approach of
these files being ignored from tracking in the Git repository and they
are shipped via the release packages later on. This way the end users
still don't need to have bison dependency installed to install PHP.
The genfiles script was refactored to generate the ext/json parser and
lexer files.
Since PHP 5.3 the default lexer generator is RE2C. On Unix-alike build
systems there is also optional configure option --enable-re2c-cgoto
which enables optimized conditional jumps using non-standard computed
goto extension. It is available since RE2C 0.10.3 so it's well covered
by RE2C versions PHP uses. This patch syncs usage of -g option accross
the PHP Unix-alike build system.
