How to force -fPIC on package builds?

[Boespflug, Mathieu]

I've made more explicit how to setup the docker container in the issue
tracker: https://github.com/tweag/HaskellR/issues/257#issuecomment-239759880

--
Mathieu Boespflug
Founder at http://tweag.io.

On 14 August 2016 at 23:49, Dominick Samperi <djsamperi at gmail.com> wrote:

> Thanks for looking into this Mathieu. I have been using this hsc2hs
> flag all along, and it has enabled me to build inline-r, but the build
> of H fails (using ghc-8.0.1). As you mention in your issue tracker,
> the new twist is to add ghc-options: -dynamic to the cabal file for H
> (and for any binary that links to inline-r).
>
> BTW, how can I compare my results with yours if all I know is that you
> have used "a docker container"? Wouldn't I need to know what
> repository and snapshot you are using?
>
> On Sun, Aug 14, 2016 at 2:55 PM, Boespflug, Mathieu <m at tweag.io> wrote:
> > I was able to reproduce in a docker container and tracked down the
> source of
> > the issue: https://github.com/tweag/HaskellR/issues/257
> >
> > The executive summary is that if Cabal is asking hsc2hs to link to a
> dynamic
> > library, then it should pass --cflag=-fPIC to hsc2hs. Otherwise hsc2hs
> might
> > fail, because then it might be impossible to link the temporary object
> files
> > that it creates with the shared library.
> >
> > A workaround is to set "cc-options: -fPIC" in the .cabal file. But in my
> > mind this is probably a Cabal bug.
> >
> > --
> > Mathieu Boespflug
> > Founder at http://tweag.io.
> >
> > On 14 August 2016 at 06:12, Dominick Samperi <djsamperi at gmail.com>
> wrote:
> >>
> >> I should add that H builds and runs nicely under Windows and MacOS
> >> (using ghc 8.0.1), so this is indeed a Fedora Linux issue.
> >>
> >> On Sat, Aug 13, 2016 at 10:22 AM, Dominick Samperi <djsamperi at gmail.com
> >
> >> wrote:
> >> > Hello Mathieu,
> >> >
> >> > I'm using Fedora 23. The default Haskell Platform here provides ghc
> >> > 7.8.4, and this seems to have even more problems. Thus I have been
> >> > trying to use ghc 8.0.1 compiled from source. I think the red herring
> >> > bit may apply to 32 bit builds, but I am attempting a 64 bit build.
> >> > The problem may be related to the way modules are randomly relocated
> >> > for security reasons, Fedora security policies, and confusion/bugs in
> >> > the linker(s).
> >> >
> >> > Cheers,
> >> > Dominick
> >> >
> >> >
> >> > On Sat, Aug 13, 2016 at 7:43 AM, Boespflug, Mathieu <m at tweag.io>
> wrote:
> >> >> Hi Dominick,
> >> >>
> >> >> which version of Fedora Linux are you on? The -fPIC message from the
> >> >> linker
> >> >> may well be a red herring. AFAIR generating PIC is the default in
> GHC,
> >> >> at
> >> >> least for dynamic libraries.
> >> >>
> >> >> Best,
> >> >>
> >> >> --
> >> >> Mathieu Boespflug
> >> >> Founder at http://tweag.io.
> >> >>
> >> >> On 13 August 2016 at 05:55, Dominick Samperi <djsamperi at gmail.com>
> >> >> wrote:
> >> >>>
> >> >>> Hello,
> >> >>>
> >> >>> I am getting relocation errors when building an executable
> >> >>> (specifically, the "H"
> >> >>> executable -- part of haskellR) under Fedora Linux, and the message
> >> >>> says
> >> >>> to
> >> >>> "recompile with -fPIC".
> >> >>>
> >> >>> The FAQ associated with H suggests that I switch to the gold linker
> >> >>> (ld.gold) due to bugs in the default linker (ld.bfd), but this only
> >> >>> changes the wording of the relocation error messages.
> >> >>>
> >> >>> I have tried several strategies for satisfying the -fPIC
> requirement:
> >> >>> 1. In cabal files I insert cc-options: and ghc-options: lines
> >> >>> including
> >> >>> -fPIC
> >> >>> 2. To the 'cabal install' command line I add:
> >> >>>     --ghc-option=-fPIC --hsc2hs-option=-cflag=-fPIC
> >> >>> 3. When building ghc 8.0.1 from source I modify config.mk by
> >> >>> including:
> >> >>>    CONF_CC_OPTS += -fPIC
> >> >>>    SRC_HSC2HS_OPTS += --cflag=-fPIC
> >> >>>    CONF_CC_OPTS_STAGE0 = -fno-stack-protector -fPIC
> >> >>>    [same for STAGE1 and STAGE2]
> >> >>>
> >> >>> All of this doesn't fix the problem, and the error messages still
> say
> >> >>> "recompile with -fPIC".
> >> >>>
> >> >>> This may be a bug, but I'm not sure where. Any ideas?
> >> >>>
> >> >>> Thanks,
> >> >>> Dominick
> >> >>> _______________________________________________
> >> >>> ghc-devs mailing list
> >> >>> ghc-devs at haskell.org
> >> >>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
> >> >>
> >> >>
> >
> >
>
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