There is no need to change bootstrap requirement because the old lex can build head just fine AFAICT. Although it's nice to update the generated files, I don't see any functional changes between two.
Also, 0 -> NULL changes were not mine.

https://svnweb.freebsd.org/changeset/base/298241

In D28596#640171, @jkim wrote:

There is no need to change bootstrap requirement because the old lex can build head just fine AFAICT. Although it's nice to update the generated files, I don't see any functional changes between two.

The built lex works just fine, and is functionally the same. I did this for reproducibility, lex built from old lex is not binary identical to one built from new lex. This is one change of many I have in my queue to have binary identical output of make buildworld and buildkernel, no matter the host.

Also, 0 -> NULL changes were not mine.

https://svnweb.freebsd.org/changeset/base/298241

Good to know about that. This is literally me just regenerating the files, so I'll maintain the NULL check style.

I still don't like to change the bootstrap requirement. Other than that, it looks good to me.

In D28596#640180, @jkim wrote:

I still don't like to change the bootstrap requirement. Other than that, it looks good to me.

That's fair. In the general case I suppose people won't care, and if a person wants to guarantee a reproducible build they can force the bootstrap tools.

if a person wants to guarantee a reproducible build they can force the bootstrap tools.

Exactly.

BTW, initparse.c and initparse.h were generated with yacc. Therefore, it is technically "regen after byacc 20200330 (r363170)".

In D28596#640192, @jkim wrote:

BTW, initparse.c and initparse.h were generated with yacc. Therefore, it is technically "regen after byacc 20200330 (r363170)".

Right! I've been sitting on this for the better part of a year, and my original commit message was 'update flex'.. not exactly helpful for making a quality commit message when submitting upstream ;)

Please see the following commits.

https://cgit.freebsd.org/src/commit/?id=34e67bb5977049afb3e965b52b86ac12ea4899b4
https://cgit.freebsd.org/src/commit/?id=80f31432743446a1e8e4f8cb8268b74ac4e4f2da
https://cgit.freebsd.org/src/commit/?id=bf80e08ed5ed32bbfd50674c01f8a0e519133e17

In D28596#640302, @jkim wrote:

Please see the following commits.

https://cgit.freebsd.org/src/commit/?id=34e67bb5977049afb3e965b52b86ac12ea4899b4
https://cgit.freebsd.org/src/commit/?id=80f31432743446a1e8e4f8cb8268b74ac4e4f2da
https://cgit.freebsd.org/src/commit/?id=bf80e08ed5ed32bbfd50674c01f8a0e519133e17

Yeah, just saw those. I'll also regen the init files after those changes and see if there are differences. That'll be in a few hours though.

Please regen initskel.c because flex.skl was updated in 6b7e592c215fb76ea027f25030ddc9a697184fbe. Note it was also MFC'ed to stable/13 and releng/13.0.