Frederico Franzosi wrote:
I'll try to make it short.
I'm developping a package wich imports C functions.
the fact is that when I try to compile if I call the compiler in the
usual way, using -package and -llib it gives an undefined reference
error...
For example if I use:
$ghc -package PKGname-PKGversion -fffi -o main Main.hs -llib
it gives an error message (undefined references of objects from PKG to
functions in lib)
but if I use:
$ghc -fffi -o main Main.hs -llib /path/to/PKGlib.a
it compiles correctly.
It looks like -llib is appearing earlier on the linker's command line
than the library from your package, when you use -package. You haven't
specified a dependency between the two, so GHC is making an arbitrary
choice.
The right way to fix this, if your package depends on a library, is to
include that library in the "extra-libraries" field of the package.
Cheers,
SImon
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