I'm trying to build 7.10.1 RC on Debian Jessie. I get an error:
configure: error: in
`/ghc-7.10.0.20141222/libffi/build/x86_64-unknown-linux-gnu':
configure: error: C++ preprocessor /lib/cpp fails sanity check
config.log shows:
configure: failed program was:
| /* confdefs.h */
| #define
Thank you Sven and Brandon for your help. I'm now able to build 7.10.
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According to https://ghc.haskell.org/trac/ghc/ticket/9720, g++ isn't even
used for building. and passing in gcc for CXX seems to work fine. Wonder
if that's changed.
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Trying to build 7.8.4 from the source distribution (linux).
make install-strip should work as per trac #1851, and the target does indeed
appear in distrib/Makefile. However, the build uses the top-level Makefile,
which doesn't, leading to
# make install-strip
===--- building phase 0
make -r
I need to build GHC 7.8 so that Template Haskell will work without shared
libraries (due to a shortage of space).
I understand that this can be done by turning off DYNAMIC_GHC_PROGRAMS and
associated build options. Is this possibility going to be kept going
forward, or will it be deprecated once
harry wrote
I need to build GHC 7.8 so that Template Haskell will work without shared
libraries (due to a shortage of space).
I understand that this can be done by turning off DYNAMIC_GHC_PROGRAMS and
associated build options. Is this possibility going to be kept going
forward
Linux?
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John Lato-2 wrote
I'd like to compile ghc-7.8.2 with DynamicGhcPrograms disabled
Are you able to use template haskell (and qusiquoting) with this? Don't they
need dynamic libs?
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John Lato-2 wrote
I'd like to compile ghc-7.8.2 with DynamicGhcPrograms disabled
Are you able to use template haskell (and qusiquoting) with this? Don't they
need dynamic libs?
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It having been suggested that a buildbot for Windows may be needed, and it
being possible that I may receive permission from management for setting one
up in my department's server room, I set about attempting to discover what
this actually entails.
A Google search led me to
Johan Tibell-2 wrote
We now have a (Linux) travis-ci buildbot so we should be able to use
whatever script that buildbot runs.
Does this mean that the Builder page is also no longer relevant? And if so,
how could a Windows buildbot be set up?
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Mikhail Glushenkov-2 wrote
Austin promised to provide us with build bots for 3/4 of the tier 1
platforms. I assume that he is busy with preparing with the 7.8
release now.
How often is cabal-install released? Requiring a dedicated buildbot seems
like an overkill just for publishing binaries. I
There hasn't been a HWN since mid-December. I've emailed the editor with no
response, and there doesn't seem to have been any (public) online activity
from him since.
I hope he's OK, but either way, it seems that HWN needs a new editor. Any
volunteers?
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I've been getting the impression that a lot of the stickier GHC bugs are
Windows specific, while very few GHC hackers actually use Windows, other
than to ensure that GHC works on it.
Windows is already somewhat of a second-class citizen in Hackage, where
platform-sensitive packages tend to only
Niklas Larsson wrote
Seems to me that a less pessimistic solution would be to set up a windows
buildbot.
We need a meatbot who can fix Windows issues in GHC.
What's the current state with buildbots? Wondering around the wiki led me to
http://darcs.haskell.org/ghcBuilder/builders/, which
Should the binary distribution be stripped? Not a huge deal, but I'm saving a
fair amount of space by stripping
http://www.haskell.org/ghc/dist/7.8.1-rc2/ghc-7.8.0.20140228-x86_64-unknown-linux-rhel65.tar.bz2
after installing it.
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If I use the gold linker with 7.8.1rc2 (RHEL bindist), anything using network
in build-depends - even if it's not used in the code - fails to build with:
libHSunix-2.7.0.1-ghc7.8.0.20140228.so: error: undefined reference to
'sem_unlink'
libHSunix-2.7.0.1-ghc7.8.0.20140228.so: error: undefined
Carter Schonwald wrote
b) some sort of platform-lite thats the ghc bin dist + cabal-install,
targeted at folks using haskell on server rather than desktop envs --
there
was a bunch of strong support for this (esp those using haskell and aren't
on the major linux distros)
Would like the
Carter Schonwald wrote
Let's not get off track :-). I'm pretty sure some folks occasionally need
to do profiling/perf debugging on a live server.
So you support there being some easy way to get ghc and cabal-install
together or no? (Heroku is a good example I guess)
If the only difference
Carter Schonwald wrote
Yes. (And thence ghc itself is then invoked with dynamic or dynamic-too)
The docs for 7.8.1 say Template Haskell must now load dynamic object
files,
not static ones. Does this mean that, if I'm using Template Haskell,
every
package which the templates depend on have
Michael Snoyman wrote
When upgrading to a new version of GHC, you'll have to reinstall all of
the
packages anyway. You can't simply use GHC 7.6 compiled packages with your
new GHC 7.8.
This is probably the point at which it would be useful to know that all this
recompilation will have to be
The docs for 7.8.1 say Template Haskell must now load dynamic object files,
not static ones. Does this mean that, if I'm using Template Haskell, every
package which the templates depend on have to be built with --enable-shared?
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I'm unable to install the binary distribution of 7.8.1 on RHEL because it
requires libgmp.so.10 and GLIBC_2.15, which are much greater than the
version available on Red Hat. (I'm on a shared system without root access,
so upgrading libc is out of the question, even if it could be done.) If this
is
Would it be possible for the bindist to link to libgmp.so instead of
libgmp.so.10? Are you expecting core dumps with the wrong version?
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Would it be possible for the bindist to link to libgmp.so instead of
libgmp.so.10? Are you expecting core dumps with the wrong version?
I tried faking it, and now it's complaining about GLIBC_2.15. Seems like I
might just have to build from source on Red Hat.
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http://www.haskell.org/ghc/dist/current/dist/ and
http://www.haskell.org/ghc/dist/stable/dist/ are empty. Is this correct?
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The documentation for --split-objs states that this only makes sense for
libraries. How is an executable compiled against a split-objs library?
According to
https://github.com/haskell/cabal/issues/1611#issuecomment-30750655, this
isn't happening by default.
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Brandon Allbery wrote
I don't understand the question. Whether a library is split-objs or not
does not affect how you link an executable, only the space/time efficiency
trade-off of doing so. And while in theory you might see improvements by
split-objs-ing an executable, it doesn't make a
I'm trying to use GHC with the gold linker. This is what I get:
ghc Main -pgml ld.gold
Linking Main ...
ld.gold: error: cannot find -lrt
ld.gold: error: cannot find -lutil
ld.gold: error: cannot find -ldl
ld.gold: error: cannot find -lgmp
ld.gold: error: cannot find -lm
ld.gold: error: cannot
Albert Y. C. Lai wrote
On 13-07-25 03:14 PM, harry wrote:
How can I change the location that ghc and ghc-pkg use for the user's
package
directory? I'm running GHC in a very restricted environment where I don't
have access to $HOME, but I can use specific subdirectories.
Cannot. But you
harry wrote
$ ghc-pkg check --package-db=~/cabal
ghc-pkg: ~/cabal: openFile: does not exist (No such file or directory)
$ ls ~/cabal
package.cache
Ah, the ~ seems to have been tripping it up. Thank you.
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How can I change the location that ghc and ghc-pkg use for the user's package
directory? I'm running GHC in a very restricted environment where I don't
have access to $HOME, but I can use specific subdirectories.
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Stephen Paul Weber wrote
You can create the link somewhere else, and use LD_LIBRARY_PATH
I have done this before. If your version of libgmp is compatible, it
should
work.
Thank you - that worked!
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I've had a lot of trouble installing the pre-build binary of GHC on various
Linux systems for which packages don't exist - all of this stems from GHC
looking for libgmp.so, instead of libgmp.so.3. Various combinations of
--with-gmp-libraries haven't helped, particularly as I need a packaged build
Stephen Paul Weber wrote
Somebody claiming to be harry wrote:
all of this stems from GHC
looking for libgmp.so, instead of libgmp.so.3
Most systems symlink libgmp.so to the default version installed. On
Debian
stable it's libgmp.so.10 ... so it may work for you, but you may want
Brandon Allbery wrote
Linux ld.so doesn't work that way.
What does the --with-gmp-libraries option do? I've tried using it with a
local shortcut, but it didn't help.
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Sjoerd Visscher-2 wrote
equal pair@Pair{} = foo pair == bar pair
Interesting solution, I didn't know you could do that. (Do all those who
suggested GADTs - you can add a type context to the constructor of a regular
data type as well, they don't bring you anything here.)
I've also been
Sjoerd Visscher-2 wrote
class Foo f where
foo :: a - f a
data Bar f a = Foo f = Bar {bar :: f a}
instance Foo (Bar f) where
foo a = Bar (foo a)
No, you can only omit it where you provide Foo f in another way.
Which brings me back to my original question - is there any way that
Brandon Allbery wrote
No. The point is, it's not simply a type annotation; it's a *value* (a
dictionary) that must be carried along with the rest of the value somehow.
The compiler can't always work out statically which instances need to be
used with the affected value, so it has to be
+1 for the -XDotPostfixApply proposal
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Johan Tibell johan.tibell@... writes:
If we truly believe that the instance is dangerous for users (and not
merely for people who don't understand floating point arithmetic on
computers), then we should add a deprecation pragma to the instance and
discourage its use. But what would the
Tillmann Rendel rendel@... writes:
In general, I would be against removing features just because they are
confusing for beginners. I don't think that's a good design principle
for a language that is primarily targeted at professional programmers
and computer scientists.
They're confusing
There have been several discussions over the years regarding Enum instances
for Float and Double. The conclusion each time appears to have been that
there are no instances which are both sane and practical.
I would like to propose that these instances be removed from Haskell 2014.
This may be
Johan Tibell johan.tibell@... writes:
I don't see much gain. It will break previously working code and the
workaround to the breakage will likely be manually reimplementing enumFromTo
in each instance.
I forgot the main point of my post :-)
The primary motivation for removing these instances
(I posted the following to gmane.comp.lang.haskell.glasgow.bugs, but I think
that might have been the wrong list.)
I was recently having some trouble building a package through an IDE. When I
tried it from the command line, GHC popped up the following dialogue box:
ghc.exe - Entry Point Not
Edward Kmett ekmett at gmail.com writes:
* Haskell Qt Binding Generator by Zhengliang Feng, mentored by Carter
Schonwald with help from Ian-Woo Kim
Interesting, as this has been done at least twice before. Is there a public
write-up of what's going to be different this time?
On Tue, 26 Mar 2013 08:58:18 +0100, Eric Wong wsysdu at gmail.com wrote:
The best way to do this, is to download from
https://github.com/atzedijkstra/wxHaskell
. (This is the most up to date repository online.) Then replace the
wxcore\Setup.hs file with the one attached to this e-mail
Edward Kmett ekmett at gmail.com writes:
There should be a link from the google-melange website, but one slight
shift in focus is on either getting SWIG bindings or possibly even using
Ian-Woo Kim's C++FFI tools. Carter may be able to go into more detail.
There's almost no information in the
Good to see it released! Was there a deliberate decision not to build a
Windows x64 platform, or is it just that there wasn't anyone to do it?
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Niklas Hambüchen mail at nh2.me writes:
Reading the other thread (Adding Applicative/Functor instances to all
Monads in GHC) I was wondering if there was infrastructure for testing
what effect making the often-discussed Functor/Monad change would have:
How many packages on hackage would break
Mark Lentczner mark.lentczner at gmail.com writes:
Some of the release candidates for Haskell Platform 2013.2 are up.These
are what I expect to simply re-brand as the release, unless anyone
uncovers some issues.
Will they go on
http://trac.haskell.org/haskell-platform/wiki/ReleaseCandidates?
Hans Georg Schaathun georg+haskell at schaathun.net writes:
Does anyone have experience with integrating Haskell and Java?
I have done some searching, finding a lot of pointers but hardly
anything in terms of evaluation, successes, or caveats.
From what I see Frege looks promising,
Dan Doel dan.doel at gmail.com writes:
However, another thing to consider is that getting rid of data type
contexts was accepted into the language standard.
... which means that implementers should be free to fix data type contexts
however they like, as they are now complier extensions which
If I understand correctly, the problem with datatype contexts is that if we
have e.g.
data Eq a = Foo a = Foo a
the constraint Eq a is thrown away after a Foo is constructed, and any
method using Foos must repeat Eq a in its type signature.
Why were these contexts removed from the language,
Kim-Ee Yeoh ky3 at atamo.com writes:
data Foo a where
Foo :: Eq a = a - Foo a
is equivalent to
data Foo a = Eq a = Foo a
but is different from
data Eq a = Foo a = Foo a
... and nothing in GADTs does what one would naively expect the last
declaration to do.
Brandon Allbery allbery.b at gmail.com writes:
As I understand it, it's because fixing them involves passing around a
dictionary along with the data, and you can't do that with a standard
declaration (it amounts to an extra chunk of data that's only *sometimes*
wanted, and that sometimes
Jeff,
I don't think your code works in general, since it is not guaranteed that
x' == mzero is allowed unless (m b) is an instance of Eq. I'm unsure if you
are able to test for mzero in general.
Harry
On Mon, Mar 26, 2012 at 3:11 PM, Jeff Shaw shawj...@msu.edu wrote:
can :: (MonadPlus m
This is more of an algorithm question than a language question, but any
insights would be much appreciated.
The problem is to input a series of programs and find previous
occurrences of the same algorithm.
The programs consist of a set of input parameters (a, b, c, ...), and a
set of
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