How to force -fPIC on package builds?

[Dominick Samperi]

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
>>
>>