Hi Roman, strangely enough, now that I've recompiled the program cabal does pass the correct flag and everything works as expected. Which kinda surprise me. The only explanation I have is that I've modified the source code, so cabal was forced to recompile everything with the new flags. Thanks, A. On 20 October 2013 16:40, Roman Cheplyaka wrote:

You could start by running cabal with -v and seeing if it passes the right option to ghc during the linking phase.

Roman

* Alfredo Di Napoli [2013-10-20 15:27:54+0100]

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Hello guys,

I'm integrating EKG in my webserver and I've stumbled upon a peculiar behaviour: Putting this inside my cabal manifest seems to not trigger any effect (EKG shows flat lines):

GHC-Options: -Wall -threaded -Werror -fwarn-tabs -with-rtsopts=-T

Whereas, if I run my webserver with "blablabla [...] +RTS -T" everything works as expected. What am I missing?

I am on GHC 7.6.3, Cabal 1.18 and Mac OS X 64 bit.

Alfredo

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Thanks Brandon, it makes sense, dumb me for not having thought that in the first place. A. On 20 October 2013 17:08, Brandon Allbery wrote:

On Sun, Oct 20, 2013 at 11:50 AM, Alfredo Di Napoli < alfredo.dinapoli@gmail.com> wrote:

...

strangely enough, now that I've recompiled the program cabal does pass the correct flag and everything works as expected.

Yes, that is in ghc-options and therefore only does something when you compile; it's not consulted at runtime (indeed, running a program doesn't even look at the cabal file).

-- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net

* Roman Cheplyaka [2013-10-20 19:16:34+0300]

* Brandon Allbery [2013-10-20 12:08:59-0400]

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On Sun, Oct 20, 2013 at 11:50 AM, Alfredo Di Napoli < alfredo.dinapoli@gmail.com> wrote:

...

strangely enough, now that I've recompiled the program cabal does pass the correct flag and everything works as expected.

Yes, that is in ghc-options and therefore only does something when you compile; it's not consulted at runtime (indeed, running a program doesn't even look at the cabal file).

Not really. -with-rtsopts is a linking-time flag that sets the default RTS options. See http://www.haskell.org/ghc/docs/7.6.3/html/users_guide/runtime-control.html#...

Oh, I think I misunderstood what you're saying. You were pointing out that Alfredo didn't recompile his program. I thought you're saying that this isn't supposed to work at all. Sorry for the noise. Roman