ltrace on FFI calls

[Henning Thielemann]

I want to trace calls from a Haskell program to LLVM. I tried ltrace and 
latrace. latrace didn't trace anything useful and ltrace shows at least 
the call to one function (LLVMBuildRetVoid), but not the other ones. I'm 
quite confident that I linked to LLVM dynamically, since the executable is 
small (35 KB, not 60 MB as when linking statically). Do GHC-generated 
programs call a foreign library in a way that bypasses ltrace?