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).
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