osx - What determines linking behaviour for GHC on OS X? -

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i'm observing different linking behaviour between 2 machines when compiling binary.

each has same ghc (7.8.3), same code, same flags (-wall -o2), same libgmp (installed homebrew on each):

machine-one$ otool -l my-binary my-binary:         /usr/lib/libsystem.b.dylib (compatibility version 1.0.0, current version 1197.1.1)         /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)  machine-two$ otool -l my-binary my-binary:         /usr/lib/libsystem.b.dylib (compatibility version 1.0.0, current version 1197.1.1)         /usr/lib/libiconv.2.dylib (compatibility version 7.0.0, current version 7.0.0)         /usr/local/lib/libgmp.10.dylib (compatibility version 13.0.0, current version 13.0.0)

i can't life of me figure out why libgmp linked dynamically on second machine.

in terms of differences i've been able recognize: ghc has been installed via binary distribution os x on first machine , homebrew on second. c compilers, have:

machine-one$ cc --version apple llvm version 6.0 (clang-600.0.51) (based on llvm 3.5svn) target: x86_64-apple-darwin13.4.0 thread model: posix  machine-two$ cc --version apple llvm version 6.0 (clang-600.0.54) (based on llvm 3.5svn) target: x86_64-apple-darwin13.4.0 thread model: posix

what typically determines linking behaviour, , how can enforce 1 linking method or other?

edit: i've observed same behaviour happening zlib on yet machine, it's not gmp-specific issue.

edit: i've plucked ghc --info each of machines, here machine one , machine two. , here's the diff between 2 well.

edit: i've reinstalled ghc on machine 2 via distribution binary, , sure enough libgmp not dynamically linked when recompile binary. seems related installing ghc via homebrew.

still quite interested in what's going on exactly.

the crucial difference machine #2 has /usr/local/lib in linker path, , using brew's linker (/usr/local/library/env/4.3/ld). ghc still uses external linker, if isn't using c backend code generation, can combine haskell code code written in other languages (crucial haskell's many ffi bindings third-party libraries). should asking brew people why things linked differently. it's not ghc issue.


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