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haskell-users-guide.md: document static linking

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Peter Simons 2015-10-02 08:29:16 +02:00
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@ -666,6 +666,27 @@ to find out the store path of the system's zlib library. Now, you can
The same thing applies to `cabal configure`, of course, if you're
building with `cabal-install` instead of Stack.
## Creating statically linked binaries
There are two levels of static linking. The first option is to configure the
build with the Cabal flag `--disable-executable-dynamic`. In Nix expressions,
this can be achieved by setting the attribute:
enableSharedExecutables = false;
That gives you a binary with statically linked Haskell libraries and
dynamically linked system libraries.
To link both Haskell libraries and system libraries statically, the additional
flags `--ghc-option=-optl=-static --ghc-option=-optl=-pthread` need to be used.
In Nix, this is accomplished with:
configureFlags = [ "--ghc-option=-optl=-static" "--ghc-option=-optl=-pthread" ];
It's important to realize, however, that most system libraries in Nix are built
as shared libraries only, i.e. there is just no static library available that
Cabal could link!
# Other resources