(adding the linker flags to ld_opts does not make a difference for the rest of the story)

To make everything work with ghc, I do the following:

* gcc -c foo.c -o foo.o

* ghc -c Foo.hs -o Foo.o

* ar -rsv libHSFoo.a foo.o Foo.o

Now, I can compile programs with "ghc -package foo". Great!

However, when I try ghci, it does not work. So, first, I make a .o version of libHSFoo.a:

* gld -r --whole-archive -o HSFoo.o libHSFoo.a

But, when I start "ghci -package foo", it does not find the library libbar! It does not even find it when I say "ghci -L/path/to/libs -lbar -package foo"!

You should add "bar" to the 'extra_libraries' field of the package config, because otherwise GHCi doesn't know about the dependency.

No worries, we can make ghci read a .so file instead:

* rm HSFoo.o

* gcc -shared Foo.o foo.o -L/path/to/libs -lbar -o libHSFoo.so

Starting ghci now loads libHSFoo.so, and everything works wonderfully.

I'm highly surprised if this really works. Can you actually call functions from the Foo module without it crashing? Cheers, Simon