Re: Please help debug - usage of luars232

[Philipp Janda <siffiejoe@...>]

Am 14.09.2013 06:55 schröbte Jayanth Acharya:
> However, I'd also be quite interested in the other method that you
> suggested. Since I installed the "luars232" library using luarocks, I am
> not quite sure if there is a place on this machine where the library
> sources are there, and I can enable DBG and rebuild it. Or, should I clone
> the "luars232" module from Git and then do this ? If the latter, do I first
> uninstall the version installed via luarocks ?

If the rock uses the `builtin` build type (like luars232) you can 
download the rockspec[1] from the luarocks site[2], modify the rockspec 
to include the proper defines, and install the rock via the modified 
local rockspec:
    luarocks install luars232-1.0.3-1.rockspec

In your case the modified build section in the rockspec would look like 
this:

    ...
    build = {
       type = "builtin",
       platforms = {
          unix = {
             modules = {
                luars232 = {
                   sources = { "src/rs232.c", "src/rs232_posix.c", 
"bindings/lua/luars232.c" },
                   incdirs = { "include" },
                   defines = { "RS232_DEBUG=1", "LUAROCKS_HACK 
-std=gnu99" },
                -- ^^^^^^^^^^^^^^^^^^^^^^^^^^^
                }
             }
          },
    ...


If the rock in question does *not* use the `builtin` build type I would 
download and unpack the corresponding source rock (just a zip archive, 
see e.g. [3]), modify the build scripts and/or source files inside, move 
the included rockspec file to the top-level source directory and call 
from there:
    luarocks make

You could also try this with a clone of git head, but some projects 
require a non-trivial packaging step (like generating some source file), 
in which case this approach would fail unless you also perform those 
packaging steps yourself.

  [1]: http://luarocks.org/repositories/rocks/luars232-1.0.3-1.rockspec
  [2]: http://luarocks.org/repositories/rocks/
  [3]: http://luarocks.org/repositories/rocks/luars232-1.0.3-1.src.rock

In both cases you don't need to uninstall anything, the old files in the 
local rocks tree just get replaced.

HTH,
Philipp