nitralime wrote:
**As I have already mentioned in my other post
I am aware of two other functional web frameworks
(HOP and Links) which in my opinion provide
a similar functionality as Ur/Web!
I'm just curious about how Ur/Web compares to these frameworks!
There are many incidental
nitralime wrote:
Thank you very much for your feedback!
Any other feedback is also very much appreciated!
I know you're just trying to be polite, but I think most people on this
list would prefer that you didn't take up their attention with messages
that just thank people and repeat that
David Snider wrote:
Adam Chlipala wrote:
David Snider wrote:
Adam Chlipala wrote:
Also keep in mind that Ur/Web is not implemented to work with the
model where you create a database and then interface with it.
Ur/Web wants to control all database tables, and the database is
really just
nitralime wrote:
On Sun, Sep 20, 2009 at 1:38 PM, Adam Chlipala
ad...@impredicative.com mailto:ad...@impredicative.com wrote:
nitralime wrote:
Just for your Info!
On the page (http://www.impredicative.com/ur/more/)
I got the following error message by clicking on Grid1
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- Bug fixes
- Improvement to choice of line number to cite in record unification error
messages
- SELECT DISTINCT
- New extra demos: orm1 and versioned1
___
Ur
There's a new issue tracker for Ur/Web, where you can report bugs and
make feature requests.
http://www.impredicative.com/mantis/
I'd ask anyone who has reported an issue that's not yet been addressed
to please add it to that system. Don't be shy about adding your feature
requests, though
Kirill Zaborsky wrote:
Why not to use e.g. trac which can show issues without obligatory sign-up
I chose Mantis because it's my favorite among those systems that I have
experience with. That set of systems does not include Trac.
___
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David Snider wrote:
OK, Thanks. There are some other things I don't understand:
With sum defined, it is easy to make some sample calls. The form of the
code for main does not make it apparent, but the compiler must reverse
engineer the appropriate {Unit} from the {Type} available from the
Artyom Shalkhakov wrote:
I'm not planning that for any time soon. Since the only compiler is
whole-program, a REPL would require significant extra implementation.
Hm, okay. Is it possible to invoke the compiler for syntax analysis
and type-checking then? Something like urweb --typecheck
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- Basis.serialized type family, for storing more types in the database
- Basis.textBlob, for building blobs from strings
- Basis.debug function, for server-side debug printing
- Bug fixes optimization
Artyom Shalkhakov wrote:
After looking at the example dlist module, I noticed that it was much
more elaborate. What is the reason for that?
The biggest reason is performance. With the naive list-based technique,
consider what happens when you want to change one element of the list:
you must
Georg Bauer wrote:
I don't know anything about the OSX development environment. I'll be happy
to accept any patch someone provides.
I think the right way to go would be to use GNU libtool - and go the
full automake+autoconf route, dynamic libraries for all supported
plattforms are an
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- -verbose flag
- COUNT(col) SQL aggregate function
- 'benignEffectful' and 'safeGet' .urp commands
- Remove Basis.getRequestHeader, since it can be used to circumvent cookie
security
- Rename Top.foldR*X to
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- New experimental checker for information flow and access control policies
(See demo at http://www.impredicative.com/ur/scdv/)
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Chris Casinghino wrote:
The urweb emacs mode seems to be very slow on large files. In
particular, scrolling down is very slow in basics.urs. It starts off
at a reasonable speed, but as I scroll further down into the file I
have to wait longer and longer for each additional page - several
I'm thinking about doing some contract programming with Ur/Web. If
anyone knows of someone looking to pay to have a custom web application
built, then I'd appreciate the chance to learn more. I'm also open to
collaborating with other programmers on work of this kind. I think
Ur/Web is a
Vladimir Shabanov wrote:
So savepoint will be introduced only where it really needed (dml with
user error handling)? I think that this is the best solution.
Yes, that's what I meant.
BTW it can be useful to have function for cancelling (and maybe
restarting) transaction as a part of
OK, I've pushed some changes to the public Mercurial repository linked
from the Ur front page.
There are two main changes relevant to this thread, based on the two
main suggestions discussed here:
- A function Basis.tryDml, for running DML in a way such that error
messages can be processed
Fredrik Roos wrote:
I've been experimenting with Ur for a while and I must say it's
impressive work. One serious drawback i have noticed though is the
lack of recursive modules. Given the way urls work in Ur, the module
structure must correspond to the link structure on the website. And
since
Fredrik Roos wrote:
On Thu, Sep 16, 2010 at 3:42 PM, Adam Chlipala
ad...@impredicative.com mailto:ad...@impredicative.com wrote:
It occurs to me that it might be not-so-scary to support recursive
modules that don't use recursion to define types. Maybe I'll try
it some time
Marc Weber wrote:
Which is the correct type for my_length2
The line below TYPE 1 show how to it for my_length
my_length2 takes two lists and sums both length. (There is no use case
but learning ur for this function)
val rec my_length
(* TYPE 1 *)
: a:::Type - list a
Marc Weber wrote:
1)
Which is the ur way to serve arbitrary files such as content-type
application/pdf ?
That would be the function [Basis.returnBlob].
Eg adding allow url css/* to the configuration file a link to
css/css.css complied. Status is still 404 (not found)
I also
Karn Kallio wrote:
The Ur/Web compiler links to the libmhash dynamic library independent of the
-static parameter being given to the compiler, which links only the liburweb
statically.
This patch makes the Ur/Web compiler also link libmhash statically with the -
static flag. The motivation is
Marc Weber wrote:
for customers its very important to avoid single points of failure.
An urweb based application could be one unless there are many providers
who could continue a project.
So I hope that this small list on the wiki grows fast so that I can tell
customers urweb is not a lock in.
Marc Weber wrote:
Excerpts from Adam Chlipala's message of Sun Nov 28 21:58:18 +0100 2010:
That's right. The runtime system will also restart if an optimistic SQL
concurrency violation is detected, when certain errors are signaled, etc..
Don't know yet whether that's smart
Marc Weber wrote:
I'd like to implement toJson and fromJson which can read typed values
from json representation and back automatically.
I still don't know how to represent this in urweb:
I'm sorry if I didn't say this clearly before: The way I would implement
this involves modifying the
Marc Weber wrote:
The manual says:
context is the type of state that persists across handling a client request
So it looks like I can use uw_(set,get)_global and uw_malloc to keep
caches.
Yes and no. The global functions will accomplish what you want.
However, pointers allocated by
Marc Weber wrote:
Excerpts from Adam Chlipala's message of Wed Dec 01 15:50:26 +0100 2010:
Yes and no. The global functions will accomplish what you want.
However, pointers allocated by uw_malloc() should not be referenced
across requests. You should use regular malloc() for such memory.
Marc Weber wrote:
Today its hard to make a project successful unless you create interfaces
for others to join or use a service. JSON is a very easy format which is
implemented in all languages I know. If you ever have tried creating
xmlrpc stuff you know that generating JSON can be simpler. So I
Marc Weber wrote:
Let's say I'd like to create an info page which lists various items such
as:
- disk space
- current heap size used by urweb
- memory allocated by embedded ruby interpreter (doesn't exist yet)
How would to design a such an interface which allows multiple libraries
to
Karn Kallio wrote:
Adam, now that somebody ( Marc Weber ) is working on an application ( payment
gateway ) where the transaction model of Ur/Web does not cleanly apply, is
there a chance of you generalizing Ur/Web transactions in a safe, principled
way ( that allows representing the semantics of
Karn Kallio wrote:
Please accept my apologies for sounding snarky or demanding.
No need to apologize. I appreciate your contributions here, and my last
reply was meant to be light-hearted. :)
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Karn Kallio wrote:
However, this does not compile:
[codesnip]
giving error:
f.ur:11:4-11:6: Expression is not a constructor function
Expression: fl
Type: Top.folder[[Type]] super
This makes sense, since you are trying to apply [fl] as a constructor
function, but it isn't one,
Stephane Le Dorze wrote:
Indeed, for a language/framework to break throught, it needs to get
momentum with a big/growing community and to play with current/hypped
technologies, take advantage of working with existing librairies and
getting a decent tooling.
I'm not sure I buy into the
Marc Weber wrote:
You try realloc and if the new pointer is a different one you fail -
causing all callback functions to be called maybe accessing memory
which may have been overridden by other threads because realloc allowed
it to be reused.
So if uw_malloc returns memory blocks which you can
Marc Weber wrote:
You're right: ur itself is not writing to the memory. There is still a
segfault. What's wrong ? Should I be using malloc only?
Yes, no callback should touch any uw_malloc()ed memory.
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Marc Weber wrote:
Excerpts from Adam Chlipala's message of Wed Dec 08 02:42:45 +0100 2010:
Yes, no callback should touch any uw_malloc()ed memory.
So what is uw_malloc worth then?
It's meant for use by the Ur/Web program itself, plus cases where FFI
functions can act a lot
Marc Weber wrote:
I could'nt compile a function which does not take arguments (passing the
conntext id) - so I had to add a dummy parameter.
I'm not sure exactly what you're referring to, but, if this is meant as
a description of something you wish you could do but haven't been able
to,
Marc Weber wrote:
The next I wasn't sure about was speed: Is it worth trying to avoid some
mallocs or not.
That's the main motivation for the special handling of context-local
heaps. I want this code to scale to many-core execution, and malloc()
will inevitably incur some thread
Karn Kallio wrote:
if anyone's worried about Ur/Web surviving or gaining
wide-spread adoption, well, just fill in as much
info/examples on the Wiki as you can, and add any usable
code you might have, or link to your projects.
Good idea! Since I was quite confused about folders a couple
Marc Weber wrote:
val context : string - value
The context function always returns an integer which represents the ctx
pointer. Its used to identify a request within Ruby.
I had to add the string - to make it compile because
context: value did not.
I would write it as:
val context :
Davor Ocelic wrote:
Let me ask a specific question: let's say you wanted to insert a date
selection widget with functionality such as:
http://dojotoolkit.org/reference-guide/dijit/form/DateTextBox.html#dijit-form-datetextbox
(Click View example on that page, as usual).
Would you code it
Karn Kallio wrote:
To support animation natively, I think Ur/Web will have to be able to express
sources over CSS properties and DOM information like the cursor position. I
believe that without these sources animation will be difficult. From looking
over basis.urs and the Ur Reference Manual,
Marc Weber wrote:
I also added a test branch. It adds the functions next and prev
to enum - howver it doesn't compile. What am I doing wrong?
== .urs file ==
class enum
val mkEnum : a ::: Type - {ToInt : a - int,
FromInt : int - a } - enum a
==
Marc Weber wrote:
Eg try this validator:
http://validator.w3.org/check?uri=http%3A%2F%2Fmawercer.de%2F%7Emarc%2Ftest.htmlcharset=%28detect+automatically%29doctype=Inlinegroup=0
(The html file was generated and uploaded to my server previously)
What's the issue?
ul/ul
withoutli tags is not
Marc Weber wrote:
I tried copy pasting the example from the demos to try whether ur
supports join on the same table:
xml- queryX (SELECT a.Id, a.A, b.Id, b.A FROM t1 as a LEFT JOIN t1 as b ON
(a.id = b.id))
(fn r = xml
/xml)
It seems it does not - I get
Adam Chlipala wrote:
Marc Weber wrote:
xml- queryX (SELECT a.Id, a.A, b.Id, b.A FROM t1 as a LEFT JOIN
t1 as b ON (a.id = b.id))
(fn r = xml
/xml)
The other problem is that the SQL syntax extension only recognizes SQL
keywords in all caps, so you need to change
Vag Vagoff wrote:
. The smallest Linode and Slicehost VPSes are only $20/mo., which
certainly seems reasonable for any serious deployment of a web
application.
Yes, but there are decent 500 MB PHP/Perl hosting for $0.83/month with
unlimited traffic and good tech support.
That's a social
Vag Vagoff wrote:
On 12.12.2010 18:06, Marc Weber wrote:
Which kind of application do you have in mind where this really matters?
Maybe we can help you find an alternative (Eg Amazon cloud like stuff)
You are not specific enough. Which web application do you have in mind?
Various small
Vag Vagoff wrote:
I'm planning to attack the problem of tail call elimination a few
months later.
It will enable emitting idiomatic imperative code from eager
functional languages.
The idea is whole program analysis and tracking which function passed
to which
and coupling them into one
Karn Kallio wrote:
Has graftid been closed down for good? The http://www.graftid.com/
does not
respond. I believe Graftid was intended to be something like a community
arena for Ur/Web development, no?
It wasn't intended as a traditional hosting platform, but rather more
for hosting
Marc Weber wrote:
1)
Is using mapM the best choice?
Haskell has sequence or sequence_
Anyway: No inserts take place. What am I doing wrong?
fun speed_test_insert () =
let
val numbers = Enum.to 1 10
in
dml (DELETE FROM st WHERE 1 = 1);
list-
Marc Weber wrote:
So would you mind running the same test on your machine?
First, I ran the test using [List.app] instead of [List.mapM] and it
worked fine, so this is the solution, for all practical purposes. :)
Second, I reproduced your bug, and I think I've isolated it to what
looks
Marc Weber wrote:
I feel the lib/ur/*.urs files should contain a little bit more
documentation.
Eg there is incl.urs - and I still have no idea what it is about at all.
Everybody knows what option.urs is about. But what does mem.urs contain?
Heh, I had forgotten that [Incl]
Karn Kallio wrote:
Same here with gcc (GCC) 4.4.3
[kkal...@eka:~/scratch/test]$ gcc test.c
[kkal...@eka:~/scratch/test]$ ./a.out
Outer
Thanks. The other important question is whether, when you look at the
code, you also expect it to output two lines, not just one.
Karn Kallio wrote:
Well, looking at the code I thought that it should output both,
because gcc
is supposed to support non-constant initializers. But I am not really any
help, because I do not know enough about gcc to say. One thing that I do
notice in your example is that the printf should be
I've taken some of the code I've been working on and divided it into two
(for now) libraries that should be of general interest. They are
available as public Mercurial repositories.
- Metaprogramming: http://hg.impredicative.com/meta
- GUIs: http://hg.impredicative.com/gui
This code requires
Marc Weber wrote:
val json_record : ts ::: {Type} -- implicit. is automatically inferred
- folder ts-- first arg?
- $(map json ts) -- second arg?
- $(map (fn _ = string) ts) -- third arg?
- json $ts -- result
Chris Double wrote:
I want to use an external service that regularly sends a POST request
to my Ur/Web application containing text data as the body of the POST.
I tried something like the following to log to a file:
fun notifyMessage body =
dml (INSERT INTO messages (Message) VALUES
Chris Double wrote:
On Thu, Dec 16, 2010 at 2:48 AM, Adam Chlipalaad...@impredicative.com wrote:
There may be a good way of supporting externally-callable forms without this
sort of acrobatics, but, for now, this method isn't so bad.
Thanks cor that, I'll try it. One issue might be
Marc Weber wrote:
Many web applications are using kind of
xml += div#{xml_content_from_db}/div;
which of course is unsafe. Which is the urweb way?
Is there a blessXml function ?
Every XML type is represented with strings at the C level, so you can
use the FFI to circumvent the type
Chris Double wrote:
This is what the post request looks like that I'm receving:
--8-
Content-Type: application/json
Content-Length: 19
{message:hello}
--8-
Oh, now I see what you mean, which should have been obvious to me from
the start (sorry).
Marc Weber wrote:
I didn't even try how well MySQL or sqlite works yet. I saw that urweb
supports sequences concluding incomplete MySQL support - which may have
been a false (but definitely healthy :) assumption.
Yes, it was a false assumption. Sequences work with every database
backend
Marc Weber wrote:
== main.urs ==
val main : unit - transaction page
val recIdTopLevel: a ::: Type - a - a
== main.ur ==
fun recIdTopLevel [a] b = b
fun main () : transaction page =
let
fun recId
Chris Double wrote:
If a Client is in a table row and the client disconnects that row is
removed automatically. Is it possible to also run a function at this
time? Say I do some work when the client connects followed by adding
them to the table, they disconnect, I want to cleanup the work I did
Marc Weber wrote:
Excerpts from Chris Double's message of Fri Dec 17 14:35:11 +0100 2010:
On Sat, Dec 18, 2010 at 2:16 AM, Adam Chlipalaad...@impredicative.com wrote:
Thanks, I've added them. Now that I've gotten over my fear of
registering with mantis I'll try and do this for any issues I
Marc Weber wrote:
http://impredicative.com/wiki/index.php/Polymorphic_Variants_Usage_Example
(* The commented out functions below do not compile .. the Medium constructor
is not polymorphic;
* it must decide on one of temp or size type
*)
[...snip...]
From reading the definitions in
Chris Double wrote:
I do the feed parsing in python. It reads the list of feeds from the
Ur/Web database, fetches them, parses them, and stores the data back
in the database.
Now that Ur/Web can have server side threads (Mantis issue 36) and
better external POST support (Mantis issue 38), I'll
Marc Weber wrote:
Excerpts from Marc Weber's message of Mon Dec 20 06:37:13 +0100 2010:
I added ticket 43 to mantis. I gave priority major because I feel this
is the weakest point of the whole urweb system.
It looks like I hit a stack overflow. I added a 0 too much. So urweb
can't
Marc Weber wrote:
urweb (http):
benchmark PHP (run by apache) (5.3):
ab -n 100 -c1 http://l/pg_speed.php 0.01s user 0.03s system 3% cpu 1.242
total
benchmark ur (http):
ab -n 100 -c1 http://l:8090/St/list 0.01s user 0.02s system 1% cpu 2.147
total
benchmark ur
Marc Weber wrote:
Another question: Does ml provide some profiling ? Or how do you find
out where the compiler is spending most time?
You can pass the '-timing' flag to the compiler to get it to dump times
spent in the different compiler passes.
Marc Weber wrote:
In which way is this related to the
e! guarded expression application?
The points where these need to be inserted are usually inferred. In
particular, this happens with a normal application of any function
defined at the top level of a module. For instance, most uses
Marc Weber wrote:
Excerpts from Adam Chlipala's message of Tue Dec 21 00:42:14 +0100 2010:
Marc Weber wrote:
In which way is this related to the
e! guarded expression application?
The points where these need to be inserted are usually inferred.
The demos make use of
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- Changes to encoding of SQL aggregate functions: nullable types may be
aggregated, and non-COUNT aggregates return nullable results.
- SQL subqueries may apply aggregate functions to columns bound in
Karn Kallio wrote:
Adding an optional alt attribute allows the programmer the choice.
Added.
I'm not sure the mailing list is the best place to send patches. I
would prefer Mantis issues, but then it's harder for others to watch and
comment.
Gergely Buday wrote:
I compiled the hello project and got hello.exe. Running that I was
unable to test it via
http://localhost:8080
What is the correct url?
It's:
http://localhost:8080/Hello/main
because you want to call function 'main' of module 'Hello'.
And, testing it via telnet
Marc Weber wrote:
a) I talked to Adam in the past about whether its worth adding a
configuration file containing database setup.
See
http://www.impredicative.com/mantis/view.php?id=26
I think it's important to stress that Ur/Web already supports
configuration files governing database
Marc Weber wrote:
Excerpts from Adam Chlipala's message of Sat Mar 26 18:56:48 +0100 2011:
I don't understand which hypothetical design structure of an Ur/Web
library you are considering here. What do you want to do and what do
you think would go wrong?
If you use PHP, Ruby, Plone,
Karn Kallio wrote:
Well, some similar fuzzy brainstorming that has occurred to me before:
To have safely tweakable themes Ur/Web could represent them as types in some
way. That probably means Ur/Web will have to represent CSS too. To naturally
support user changes of themes at run time then
Karn Kallio wrote:
What about a wiki page ? SASS/HAML could be implemented as well. It looks
like it doesn't make sense to implement all features of haml-lang.com.
But most of its syntax is much nicer to write.
I do not think that HAML or SASS add any abstractions that Ur/Web with a full
Karn Kallio wrote:
I assume safely tweakable themes require some sort of guarantee that there is
at least a minimum level of correspondence between the CSS and the XHTML. The
current mechanism of linking to a style sheet provides no guarantees on the
CSS content of that style sheet; indeed, the
sampath kirupa shankar wrote:
Please lemme know a hub where we can all meet ona daily basis for the
project.
The #ur channel on Freenode IRC is already established and has some
amount of momentum already.
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Marc Weber wrote:
Excerpts from Adam Chlipala's message of Sat Apr 16 17:21:39 +0200 2011:
I think of almost every Haskell program as an incomprehensible
entangled mess, because of implicit mutual recursion spread across
files!
You're talking about this, correct?
a = b
b
Gian Perrone wrote:
As a follow-up question, in that case, does there exist any way of
accessing the individual fields of the 'broken-down' time representation
of the 'tm' struct? That is, are concepts like seconds, minutes, hours,
days etc. exposed anywhere?
The [time] type is
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- Cygwin compatibility
- Compatibility with Gentoo packaging process, including a .ebuild file
- Change typing of SQL subqueries, to indicate that they may always
return NULL
(for no rows)
- Syntactic sugar
Chris Double wrote:
I notice Basis.requestHeader was removed - what options are there for
getting access to header information now? I'd like to be able to
access Authorization for example. Is it possible to add headers to the
response? Or should these operations be done via the FFI?
I
Chris Double wrote:
I'm trying to create a form where the user enters to amounts and a
calculation composed of these amounts is displayed while the user
types. When the form is submitted the values the user entered are
submitted.
[...]
The total is displayed as the user types as expected but
The Ur/Web Emacs mode that I wrote exhibits very poor performance in
syntax highlighting. I put wrote in quotes because almost all of the
code is lifted from sml-mode; I know very little about Emacs
programming, so it isn't at all surprising that I've made a big
performance mistake somewhere.
Robin Green wrote:
I can't imagine an impure function which has a completely pure
implementation. Examples of the reverse are easy to come up with, however.
Can you give an example of when this might happen?
I'm thinking of examples where you want to expose a library interface
that
Chris Double wrote:
In the commit callback that's passed to uw_register_transactional how
does one indicate failure of the transaction? I can't call uw_error
since that requires a context and I don't have one.
I've updated the manual with the answer to this question: call
Chris Double wrote:
Can I define a function to call when the root / path is requested?
'/main' calls 'main' for example, what does '/' call?
You can use the 'rewrite' directive to make some function the
default. If you want this to be function [main] from module [Main],
put this in your
Chris Double wrote:
On Sat, Jun 4, 2011 at 10:46 PM, Adam Chlipalaad...@impredicative.com wrote:
You can use the 'rewrite' directive to make some function the default. If
you want this to be function [main] from module [Main], put this in your
.urp file:
rewrite url Main/main
Chris Double wrote:
I rewrote an existing web application of mine in Ur/Web last weekend
to see how it performed vs the current one. [...]
The original pool server I wrote in another language struggled at
about 20 work requests per second. Once it hit 30 it would peg the
server at 100% CPU and
austin seipp wrote:
I've been learning Ur/Web a bit recently, and on my OS X machine I
encountered some failures when attempting to build the compiler using
clang for the C code.
So I made up a small patch and fixed the build issues.
Thanks! I've pushed your changes to the main Ur/Web
austin seipp wrote:
I was also thinking about making it possible to compile the ur/web
runtime as an LLVM bitcode file, and do similar for programs you
compile with the compiler. Then the final link step can merge the
files and effectively do whole program optimization, before emitting a
final
austin seipp wrote:
A final note which is worth mentioning: I removed the Ur/Web
compiler's -fno-inline invocation to GCC - is there a reason for
this flag, like a bug?
Yeah, that was working around what I concluded was a bug in some past
(possibly present?) GCC version.
The reduction in
Available as usual at: http://www.impredicative.com/ur/
CHANGELOG for this release:
- Treat local variables the same as module-level variables, for the
purpose of
implicit argument insertion
- New 'noXsrfProtection' directive for .urp files
- Non-debug builds omit source location
I've thrown together an incrementally more modern looking web site for
the Ur/Web project. What do you think?
http://www.impredicative.com/ur/
One addition is a Who's Using It? page. If anyone has a project
suitable to be linked from there, please let me know!
Robin Green wrote:
On Sat, 16 Jul 2011 17:01:12 -0500, austin seippa...@hacks.yi.org wrote:
Robin, while I understand the principle behind the secure comparison
function (to avoid a timing attack based on string length,) is there a
particular reason you need GCC to optimize at level 0? Or
Others have already helpfully pointed the way toward the proper Ubuntu
package, libpq-dev, which I believe _is_ mentioned in the Ur/Web manual,
but let me know if that or anything else is left out.
Unless you call 'urweb' with the '-debug' flag, it doesn't leave around
its temporary C source
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