[Haskell-cafe] Partial statical linking

[Jason Dusek]

Some time ago, I wrote to this list about making shared
libraries with GHC, in such a way that the RTS was linked and
ready to go. Recently, I've been looking a similar but, in a
sense, opposite problem: linking Haskell executables with some
of their non-Haskell dependencies, for distribution.

I tried passing a few different sets of options to the linker
through GHC, with -optl:

  -optl'-Wl,-r'
  -optl'-Wl,-r,-dy'
  -optl'-Wl,-static,-lffi,-lgmp,-dy'

None of these had the desired effect. In the end, running GHC
with -v and carefully editing the linker line produced the
desired change (I have linked to and provided the diff below).

The effect -optl seems to be to introduce options in the linker
line just before -lHSrtsmain, which would seem to prevent one
from linking libffi and libgmp differently. Is editing and
storing away the linker script the best option at present for
partially static linking?

--
Jason Dusek
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https://github.com/solidsnack/arx/commit/90ec5efdb0e991344aa9a4ad29456d466e022c3e
#@@ -122,10 +122,8 @@
#   -lHSarray-0.3.0.2 \
#   -lHSbase-4.3.1.0 \
#   -lHSinteger-gmp-0.2.0.3 \
#-  -lgmp \
#   -lHSghc-prim-0.2.0.0 \
#   -lHSrts \
#-  -lffi \
#   -lm \
#   -lrt \
#   -ldl \
#@@ -136,4 +134,7 @@
#   -lgcc_s --no-as-needed \
#   /usr/lib/gcc/x86_64-linux-gnu/4.6.1/crtend.o \
#   /usr/lib/gcc/x86_64-linux-gnu/4.6.1/../../../x86_64-linux-gnu/crtn.o \
#+  -static \
#+  -lgmp \
#+  -lffi \