Interesting! I'll take a closer look at this and run some tests when I
get back to Rio next week.
Thanks,
-- Hisham
On Tue, Jan 8, 2013 at 4:27 PM, Reuben Thomas <r...@sc3d.org> wrote:
> Luarocks currently makes a fairly weak guess at where to find libraries on
> Unix: it uses the prefixes "/usr" and "/usr/local", or whatever is
> configured, and appends "lib" to each. This fails, for example, to find many
> libraries on a modern multi-arch Ubuntu/Debian setup, where many libraries
> are under /usr/lib/ARCH.
>
> Of course, it's possible to configure for this case, but that only works
> per-user or at best per-system. I think it's easy to go one better, and also
> cope with other cases, like finding per-user libraries: if CC is gcc, then
> the following command:
>
> lua -e 'require "std"; s = io.shell("gcc -print-search-dirs|grep
> ^libraries"):gsub ("^libraries: =",""); for _, d in ipairs(s:split(":")) do
> print (io.shell("readlink -m " .. d):chomp ()) end'
>
> produces a comprehensive list of directories. (Here I use stdlib to get
> string.split and io.shell; from looking at LuaRocks, code to construct a
> list of library directories would be something like:
>
> local libs, s = {}, io.popen("gcc -print-search-dirs|grep
> ^libraries"):read("*a"):gsub ("^libraries: =",""); for _, d in
> ipairs(split_string(s, ":")) do libs:insert(io.popen("readlink -m " ..
> d):read("*a"):gsub ("\n$","")) end
>
> I guess this would need to be integrated into deps.lua/check_external_deps.
> Luarocks currently allows the prefix and subdirs.lib to be customized
> individually, where here we get a list of complete directories. Hence, I
> would move the checking for different types of dependency (currently handled
> by the table "dirs") outside the loop over cfg.external_dep_dirs, so that
> each type of dependency is checked separately, and then allow each to have
> its own default. If no value is provided by the user for EITHER
> external_dep_dirs OR subdirs.libdir is customized, then the above list of
> dirs can be used (setting external_dep_dirs to the list returned by the
> above code, and subdirs.lib to "").
>
> Similar code could be used to generate more intelligent defaults for headers
> by parsing the output of "cpp -v" and for binaries by parsing $PATH (the
> last is not even GCC-specific).
>
> --
> http://rrt.sc3d.org
>
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