Re: luafilesystem makefile issue

[Julien MARBACH <jmh@...>]

> 	I think it is ok, but I don't know the option '-Os'.
>  

I put the -Os option here as a bad old habit, it asks the linker to omit 
all symbol information from the output file. I use it when 
cross-compiling for embedded applications to minimize the size of the 
binaries, but there is no need of it there so I replaced it by a more 
usual -O2.

> 	Open _cgi.c and search for 'add your libraries here'.  You
> should add a line:
>
>    {"lfs", luaopen_lfs},
>
> 	before the {NULL, NULL}.  This will add the library to the
> launcher.  In cgi.lua (or t_cgi.lua) you'll have to comment the line
>
> require"lfs" => --require"lfs"
>  
I also added a #include "lfs.h" in _cgi.c to prevent a "undefined 
reference to luaopen_lfs". But I still have linking errors... Here is a 
trace of my _cgi build (I removed the -fPIC option and added my lfslib.a 
in the linking):

jmh@ubuntuBox:~/Lua/work/cgilua $ make -f Makefile_cgilua
sed -e "s|LUA_DIR|/usr/local/share/lua/5.0|" -e 
"s|LUA_LIBDIR|/usr/local/lib/lua/5.0|" -e "s|LIB_EXT||g" t_cgi.lua > cgi.lua
/usr/local/bin/luac -o cgi.lc cgi.lua
/usr/local/bin/bin2c cgi.lc | sed -e 
"s|lua_dobuffer|status=lua_dobuffer|" > cgi.lch
gcc -O2 -Wall -W -Waggregate-return -Wcast-align -Wmissing-prototypes 
-Wnested-externs -Wshadow -Wwrite-strings -I/usr/local/include/ 
-DINCLUDE_LUA -c -o _cgi.o _cgi.c
gcc -O2 -Wall -W -Waggregate-return -Wcast-align -Wmissing-prototypes 
-Wnested-externs -Wshadow -Wwrite-strings -I/usr/local/include/ 
-DINCLUDE_LUA  -o _cgi _cgi.o  lfslib.a -llua -llualib -lm -ldl
_cgi.o(.text+0x128): In function `runlua':
: undefined reference to `lua_dobuffer'
_cgi.o(.text+0x15b): In function `main':
: undefined reference to `lua_open'
collect2: ld a retourné 1 code d'état d'exécution
make: *** [_cgi] Erreur 1

The undefined ref to "lua_dobuffer" seems strange to me because it is 
intended to be referenced in liblualib.a (through the -llualib option) 
as the "nm" command tells me :

jmh@ubuntuBox:~/Lua/work/cgilua $ nm liblualib.a | grep lua_dobuffer
00001640 T lua_dobuffer

The same could be told for the undef ref to "lua_open"...

jmh@ubuntuBox:~/Lua/work/cgilua $ nm liblua.a | grep lua_open
00000520 T lua_open

Does it means that my -llualib & -llua don't refer to the right 
liblualib & liblua libraries? Or that my libraries are broken?

Thanks again,

Julien