On Fri, 13 Jul 2018, Nikita Popov wrote:

> On Fri, Jul 13, 2018 at 11:13 AM, Dmitry Stogov <dmi...@zend.com> wrote:
> 
> > I think, many core developers saw unexpected changes in
> > "zend_labguages_scanner.c" or "var_unserializer.c" after rebuilds.
> >
> > This occurs, because we use different versions of re2c, and some of them
> > produce really different code.
> >
> > They also embed version number into the generate source. Currently
> > different files in PHP source tree generated by different re2c versions:
> >
> >
> > ext/json/json_scanner.c 0.16
> >
> > ext/date/lib/parse_date.c 0.15.3
> >
> > ext/date/lib/parse_iso_intervals.c 0.15.3
> >
> > ext/pdo/pdo_sql_parser.c 0.16
> >
> > ext/phar/phar_path_check.c 1.0.3
> >
> > sapi/phpdbg/phpdbg_lexer.c 0.16
> >
> > ext/standard/url_scanner_ex.c 0.16
> >
> > ext/standard/var_unserializer.c 1.0.1
> >
> > Zend/zend_ini_scanner.c 0.15
> >
> > Zend/zend_language_scanner.c 1.0.1
> >
> >
> > I propose, to change build scripts (in master and PHP-7.3) to require at
> > least re2c version 1.0.0 (it seems 1.0.0-1.0.3 produce the same result) and
> > suppress version output into the generated files.
> >
> >
> > I'm not sure about timelib files.
> >
> 
> I don't think normalizing the version really solves anything. These 
> files should be dropped from version control entirely instead. 
> Generated files do not belong in version control.

the timelib files *must* be generated with 0.15.3: 
https://github.com/mongodb/mongo/blob/master/src/third_party/scripts/timelib_get_sources.sh#L10-L11

> re2c is widely available on Linux distros nowadays (probably 
> specifically because PHP uses it) and while there might have been 
> historical ground to bundle these generated files, there no longer is 
> one.

The timelib files will need to be continued to be bundled. There is no 
rule in the Makefile either (unlike zend_language parser(s)), so this 
should not cause issues with GIT.

cheers,
Derick

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