I am trying to contribute to a large project and am running into a bit
of a problem.
One of the lex files uses %option reentrant, which flex refuses to
compile. I am running version 2.5.4 under windows. From what I can
gather, this is a rather old version, but I have not been able to find
newer binaries.
Is there a download out there for version 2.5.33? Also, can someone
confirm that %option reentrant works with 2.5.33?
Thanks a million, and sorry if this is a FAQ.
Dec 12 '07
16  7952 
In comp.compilers Hans-Peter Diettrich <Dr**********@a ol.comwrote:
I don't think that a tool like flex really depends on special POSIX
features, apart from the file handling. More problems will result from
....a little more than that (2.5.4a only relies on file handling and is
very portable), the new (since 2002) version spawns a copy of m4 to
process some macros.
(coincidentally , I was looking at the .33 this morning, to see if it
addressed locales - 2.5.4a's rather limited) and found that aspect was not
improved in the newer version as well (lots of additional ifdef's, but
no new solutions). Perhaps someone will get interested in making flex's
parsing know about locales...
--
Thomas E. Dickey http://invisible-island.net ftp://invisible-island.net
Cygwin configures and builds current flex "out of the box," and I get
only 1 adverse indication in the testsuite.
Unfortunately that's not entirely true. If you're using Cygwin's
"text mode mounts", current flex will compile fine, but the scanners
it generates are uncompilable, due to our old friend "The Inability Of
21st Century Computer Science To Solve The Clearly Intractable And
Apparently NP-Hard "\r\n" Vs. "\n" EOL Problem". For reasons I've
been unable to determine or correct, no matter what you do the
generated source has extra EOLs and "Pseudo-EOLs" (things like
"\r\r\n").
Your recommendation to
use linux amounts to using a posix environment, more so than
cygwin. So, I'm not convinced by any of these suggestions that
avoiding posix emulations makes it easier.
True enough, but step 1 is that it has to generate usable output.
Gary R. Van Sickle wrote:
>Cygwin configures and builds current flex "out of the box," and I get
only 1 adverse indication in the testsuite.
Unfortunately that's not entirely true. If you're using Cygwin's
"text mode mounts", current flex will compile fine, but the scanners
it generates are uncompilable, due to our old friend "The Inability Of
21st Century Computer Science To Solve The Clearly Intractable And
Apparently NP-Hard "\r\n" Vs. "\n" EOL Problem". For reasons I've
been unable to determine or correct, no matter what you do the
generated source has extra EOLs and "Pseudo-EOLs" (things like
"\r\r\n").
>Your recommendation to use linux amounts to using a posix
environment, more so than cygwin. So, I'm not convinced by any of
these suggestions that avoiding posix emulations makes it easier.
True enough, but step 1 is that it has to generate usable output.
I'm not enough of a masochist to attempt Windows text mode. I haven't
heard of anyone but you telling us that anything but NotePad
compatible text in Windows is "cheating." Linux doesn't support this
kind of text mode; why should we make it impossibly difficult on
Windows?
Gary R. Van Sickle wrote:
Apparently NP-Hard "\r\n" Vs. "\n" EOL Problem".
What's the problem?
AFAIK a single "\r" is nowhere used for EOL, so it should be possible to
skip \r, and treat \n as EOL.
DoDi
[That's pretty typical, ignore the \r and look for the \n. But this doesn't
have much to do with compilers, as opposed to general Windows programming,
any more. -John]
Hans-Peter Diettrich <Dr**********@a ol.comwrites:
Gary R. Van Sickle wrote:
>Apparently NP-Hard "\r\n" Vs. "\n" EOL Problem".
What's the problem?
AFAIK a single "\r" is nowhere used for EOL, so it should be possible to
skip \r, and treat \n as EOL.
DoDi
[That's pretty typical, ignore the \r and look for the \n. But this doesn't
have much to do with compilers, as opposed to general Windows programming,
any more. -John]
Doesn't MacOS use a single \r to represent EOL rather than single \n?
However, the issue is more whether any given tool treats the
combinations of \r and \n characters in your file the way that you (or
some other tool you use) intended them to be treated (as a result I
have my own version of u2d and d2u that cannonicalizes them in the
ways that the tools I use accept them), so as our moderator said it
isn't much of a compiler question as a global question, with the
problem being that there is no universally accepted standard. Yes,
there are standards, but they aren't universally followed.
BTW, anyone who wants my copy of u2d/d2u and/or the Yacc++ grammar I
used in writing them, (Yes, I wrote a grammar to "parse" the problem.)
can get a free copy by writing me.
Hope this helps,
-Chris
*************** *************** *************** *************** *************** **
Chris Clark Internet : co*****@world.s td.com
Compiler Resources, Inc. Web Site : http://world.std.com/~compres
23 Bailey Rd voice : (508) 435-5016
Berlin, MA 01503 USA fax : (978) 838-0263 (24 hours)
Chris F Clark <cf*@shell01.Th eWorld.comwrote :
Hans-Peter Diettrich <Dr**********@a ol.comwrites:
Gary R. Van Sickle wrote:
Apparently NP-Hard "\r\n" Vs. "\n" EOL Problem".
What's the problem?
AFAIK a single "\r" is nowhere used for EOL, so it should be possible to
skip \r, and treat \n as EOL.
DoDi
[That's pretty typical, ignore the \r and look for the \n. But this doesn't
have much to do with compilers, as opposed to general Windows programming,
any more. -John]
Doesn't MacOS use a single \r to represent EOL rather than single \n?
No. MacOS uses a single ASCII CR as EOL, while Unixen use LF and MS
OSes use CRLF. In a file opened as a text stream in C, though, all of
those will be represented in that text stream as '\n'. (And obviously,
they should also be represented as '\n' in any code-reading tool (as
opposed to, e.g., binary editors) written in ISO C.)
Richard
Doesn't MacOS use a single \r to represent EOL rather than single \n?
It did. But Mac OS X switched to the Unix convention, so all is well.
Stefan
..
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