Hi Hisham,

I figured out a few details in the meantime:

On Thu, Feb 20, 2014 at 02:36:15PM -0500, Peter Colberg wrote:
>   * How do I pass the path for Lua modules to the Makefile?
> 
>     If I pass install_variables.PREFIX = "$(PREFIX)" the Lua modules
>     are installed to the prefix of the rock, but not to the common Lua
>     modules path that is returned by "luarocks path".

The trick is to install Lua modules to the path $(LUADIR), which is
set to $(PREFIX)/lua; then Luarocks moves the Lua modules to the
common directory.

>   * For a dependency installed as a rock, how do I pass its rock
>     prefix in build_variables? The build_variables of lua-hdf5
>     need to point to the rock prefixes of gcc-lua (plugin) and
>     gcc-lua-cdecl (header file).

This is more clear to me now:

What I am looking for is a build-time dependency, rather than a
runtime-dependency. Have you already considered adding build-time
dependencies to the rockspec format?

>   * How do I express the dependency on luajit >= 2.0?
> 
>   * How do I run the test suite of a module before installation?

I have two more questions:

  * The source rock uses gcc and the gcc-lua plugin to compile the headers
    of a library into pure C source code that the FFI module can digest.
    gcc-lua essentially does an API to ABI translation. The result of
    this translation is generally architecture-dependent.

    I can make “luarocks pack” include the architecture by installing the
    arch-dependent C.lua to $(LIBDIR) instead of $(LUADIR). Could this
    use case be supported by adding $(LIBDIR) to the LUA_PATH that is
    shown by “luarocks path”?

  * Does the luarocks repository support uploading multiple binary rocks
    for a single source rock? The lua-hdf5 and lua-mpi rocks need to
    match the (optional) MPI library installed on the user’s system.

    A source rock "lua-hdf5" would be accompanied by these binary rocks:

      * lua-hdf5 (without MPI)
      * lua-hdf5-openmpi (for OpenMPI)
      * lua-hdf5-mpich (for MPICH)

    Can I simply manually rename the binary rocks for the upload?

Thanks,
Peter

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