How do I build basic GHC packages with -fPIC?

[Alberto Valverde]

Hi,

I'm manage to link statically all haskell libraries to a dynamically
loadable postgreSQL extension written in haskell using:

SRC_HC_OPTS += -fPIC
SRC_CC_OPTS += -fPIC

in build.mk and passing these options to every package cabal builds:

--ghc-option=-fPIC --ghc-option=-optc-fPIC

I'm using nix but it should work in any environment if you make sure every
package cabal build gets these options (maybe by setting them in
$HOME/.cabal/config?)

HTH,
Alberto

On Tue, Dec 26, 2017 at 9:11 PM, Viacheslav Lotsmanov <lotsmanov89 at gmail.com
> wrote:

> Hi there. My actual main goal is to build my own shared library written in
> Haskell that would be compatible with application written in C even without
> knowing that is is written in Haskell. So for now I compiled my shared
> library but I only could dynamically link it to Haskell dependencies such
> as "base" and "ghc-prim" packages. But I want to statically link Haskell
> dependencies but I realized it isn't simple and straightforward task.
>
> On Freenode's #haskell I was advised I should build GHC from scratch with
> -fPIC, on the Linux (I'm using Fedora Workstation 25 on x86_64) I couldn't
> go forward without this step. So I wrote some Dockerfile based on Debian 9,
> skipping first part which is containing 'apt-get update' and installing
> 'build-essential' here is what I have:
> COPY my-build.mk /my-build.mk
>
> RUN mkdir /compile && cd /compile \
>     && wget https://downloads.haskell.org/~ghc/8.2.2/ghc-8.2.2-src.tar.xz
> \
>     && tar -xvf ghc-8.2.2-src.tar.xz \
>     && rm ghc-8.2.2-src.tar.xz \
>     && cd ghc-8.2.2/ \
>     && ./configure --prefix=/ghc-8.2.2-fpic --disable-library-profiling
> --enable-shared \
>     && cp /my-build.mk mk/build.mk \
>     && make install \
>     && cd /usr/local/bin \
>     && ls /ghc-8.2.2-fpic/bin/ | xargs -I{} ln -s /ghc-8.2.2-fpic/bin/{}
>
> And as you can see I just use my own prepared *my-build.mk
> <http://my-build.mk>* file which is:
> SRC_HC_OPTS          = -H64m -O
> EXTRA_HC_OPTS        = -fPIC
> SRC_CC_OPTS          = -fPIC -O
> GhcStage1HcOpts      = -fasm -O0
> GhcStage2HcOpts      = -fasm -O0
> GhcLibHcOpts         = -fasm -O2
> GhcLibWays           = v dyn
> DYNAMIC_GHC_PROGRAMS = YES
> DYNAMIC_BY_DEFAULT   = NO
> SplitObjs            = NO
> HADDOCK_DOCS         = NO
> BUILD_DOCBOOK_HTML   = NO
> BUILD_DOCBOOK_PS     = NO
> BUILD_DOCBOOK_PDF    = NO
> V                    = 1
> LATEX_DOCS           = NO
> HSCOLOUR_SRCS        = NO
> BeConservative       = YES
>
> I just combined it from parts I found in the internet during searching
> answers to my questions. So I built this container, I also installed
> dependencies by this commands:
> cd /mnt
> cabal update
> cabal sandbox init
> cabal install --enable-shared --ghc-option=-fPIC happy alex
> cabal install --enable-shared --ghc-option=-fPIC base-unicode-symbols
> filepath process directory lens containers qm-interpolated-string
>
> And when I tried to build my app by following commands (first command
> compiles some C-code to automatically initialize Haskell runtime, see link
> posted below, not sure if *-static*, *-shared* or *-fPIC* means something
> here but it's work in progress):
> ghc -static -shared -fPIC -optc-DMODULE=Foo src/lib-autoinit.c -outputdir
> builddir
> ghc -package-db=SOME_CABALS_SANDBOX_PKGDB_DIR --make -static -shared -fPIC
> src/Foo.hs builddir/src/lib-autoinit.o -o builddir/libfoo.o -isrc
> -outputdir builddir -Wall -O2
>
> I failed with a lot of similar errors like this one:
> /usr/bin/ld.gold: error: /ghc-8.2.2-fpic/lib/ghc-8.2.2/
> ghc-prim-0.5.1.1/libHSghc-prim-0.5.1.1.a(Classes.o): requires dynamic
> R_X86_64_PC32 reloc against 'stg_ap_0_fast' which may overflow at runtime;
> recompile with -fPIC
>
> What have I missed? What should I do to make this happen?
>
> Any progress could be found here (Dockerfile, sources of modules,
> build-scripts): https://github.com/unclechu/haskell-experiment-shared-
> library-for-c-application
> Related stack overflow issue: https://stackoverflow.com/
> questions/47978884/how-do-i-recompile-ghc-with-fpic
>
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>
>
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