Original Redmine Comment
Author Name: Sergey Kvachonok (@ravenexp)
Original Date: 2016-11-06T09:30:51Z

Looks like this is a known Flex bug:

westes/flex#102

Original Redmine Comment
Author Name: Sergey Kvachonok (@ravenexp)
Original Date: 2016-11-06T08:59:01Z

/usr/bin/flex --version
flex 2.6.2
/usr/bin/flex -d -oV3Lexer_pregen.yy.cpp ../verilog.l
../verilog.l:1078: EOF encountered inside an action
../verilog.l:1078: unrecognized rule
../verilog.l:1078: fatal parse error
make[2]: *** [../Makefile_obj:318: V3Lexer_pregen.yy.cpp] Error 1
make[2]: *** Waiting for unfinished jobs....

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2016-11-06T12:06:34Z

The Flex team seems to have terrible regression process, as they break something obvious every few years. Anyhow there's a few dozen comments like that in the two .l files, verilog.l and V3PreLex.l. Can you confirm it works if you remove the comments which match "//.*'"?

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2016-11-06T12:11:10Z

I speculate there's only two places that hit their bug, try this patch.

Original Redmine Comment
Author Name: Sergey Kvachonok (@ravenexp)
Original Date: 2016-11-06T12:19:47Z

flex-2.6.2 seems to have other issues besides // comment parsing,
like %option prefix=myscanner being completely broken.

westes/flex#113

I suggest giving up on trying to get it to work and waiting for the upstream to fix this.

If there's a way to blacklist flex-2.6.2 in the configure script that would be nice.

Original Redmine Comment
Author Name: Sergey Kvachonok (@ravenexp)
Original Date: 2016-11-06T12:22:04Z

Unfortunately I've already reverted flex to 2.6.1 system-wide,
so testing the patch won't be as easy.

Do you really think replacing all // comments with /**/ is the way to go?

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2016-11-06T13:14:46Z

I'll speculate it's those two lines and commit that, besides I expect the flex team will fix it soon.

Please reopen if you or anyone try 2.6.2 again.

Fixed in git towards 3.889.

Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2016-11-25T16:02:25Z

In 3.890.