Shared library creating on Mac OS X
Hi, I¹m hitting a problem trying create shared haskell libs to be linked into a C program on Mac OS X. I¹m using the latest download for Leopard from the GHC page: http://www.haskell.org/ghc/dist/6.10.1/witten/ghc-6.10.1-powerpc-apple-darwi n.tar.bz2 I can get basic executables working fine (with a C main() #including ghc¹s stub header), using something like: ghc -optc-O invnorm.c InverseNormal.o InverseNormal_stub.o -o cTest I started off using the following line to try to create a shared lib: ghc --make -no-hs-main -optl '-shared' -o Inv.so InverseNormal.hs This doesn¹t work on mac os x because Apple¹s gcc annoyingly takes different switches, so I changed it to: ghc --make -no-hs-main -optl '-dynamiclib' -o Inv.dylib InverseNormal.hs Which still fails at the final link giving: Linking Inv.dylib ... Undefined symbols: "_environ", referenced from: _environ$non_lazy_ptr in libHSbase-4.0.0.0.a(PrelIOUtils.o) ld: symbol(s) not found I¹ve seen similar things before, and I believe if you have full control over the source you just slip in a: #define environ (*_NSGetEnviron()) Sure enough, I can find references to environ in, for example HsBase.h Problem (as I see it) is that references to environ are already wrapped up in the static lib libHSbase-4.0.0.0.a, so without recompiling Haskell we can¹t alter the C definition now. However, given that packager must have made this behave when he compiled the distribution there must be a way to make Mac gcc accept _envrion symbols?? Has anyone seen this before / can confirm my analysis / and by any chance have a solution? Many thanks, Phil.
I¹ve made a bit of progress here after reading up on Darwin¹s GCC a bit
more:
ghc --make -no-hs-main -fPIC -optl '-dynamiclib' -optl '-undefined' -optl
'suppress' -optl '-flat_namespace' -o Inv.dylib InverseNormal.hs
This dies when it links against haskell¹s own libraries, my guess is because
they are position dependant. So the only way I see forward would be to
recompile haskell with ³fPIC².
This seems like a lot of hassle, so I¹m shelving this for now if anyone
has any other (less distruptive) ways to proceed give me a shout even if
it means linking statically.
Cheers,
Phil.
Linker error now is:
ld: warning codegen with reference kind 13 in _stg_CAF_BLACKHOLE_info
prevents image from loading in dyld shared cache
ld: absolute addressing (perhaps -mdynamic-no-pic) used in
___stginit_haskell98_Array_ from
/usr/local/ghc/6.10.1/lib/ghc-6.10.1/haskell98-1.0.1.0/libHShaskell98-1.0.1.
0.a(Array__1.o) not allowed in slidable image
collect2: ld returned 1 exit status
On 10/01/2009 02:26, "Phil"
Hi,
I¹m hitting a problem trying create shared haskell libs to be linked into a C program on Mac OS X.
I¹m using the latest download for Leopard from the GHC page: http://www.haskell.org/ghc/dist/6.10.1/witten/ghc-6.10.1-powerpc-apple-darwi.... tar.bz2
I can get basic executables working fine (with a C main() #including ghc¹s stub header), using something like: ghc -optc-O invnorm.c InverseNormal.o InverseNormal_stub.o -o cTest
I started off using the following line to try to create a shared lib:
ghc --make -no-hs-main -optl '-shared' -o Inv.so InverseNormal.hs
This doesn¹t work on mac os x because Apple¹s gcc annoyingly takes different switches, so I changed it to:
ghc --make -no-hs-main -optl '-dynamiclib' -o Inv.dylib InverseNormal.hs
Which still fails at the final link giving:
Linking Inv.dylib ... Undefined symbols: "_environ", referenced from: _environ$non_lazy_ptr in libHSbase-4.0.0.0.a(PrelIOUtils.o) ld: symbol(s) not found
I¹ve seen similar things before, and I believe if you have full control over the source you just slip in a:
#define environ (*_NSGetEnviron())
Sure enough, I can find references to environ in, for example HsBase.h
Problem (as I see it) is that references to environ are already wrapped up in the static lib libHSbase-4.0.0.0.a, so without recompiling Haskell we can¹t alter the C definition now. However, given that packager must have made this behave when he compiled the distribution there must be a way to make Mac gcc accept _envrion symbols??
Has anyone seen this before / can confirm my analysis / and by any chance have a solution?
Many thanks,
Phil.
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