[sr-dev] kamailio 3.1 app_lua - CentOS install issue

[Watkins, Bradley]

>-----Original Message-----
>From: sr-dev-bounces at lists.sip-router.org 
>[mailto:sr-dev-bounces at lists.sip-router.org] On Behalf Of Ovidiu Sas
>Sent: Monday, October 04, 2010 7:48 PM
>To: sr-dev
>Subject: [sr-dev] kamailio 3.1 app_lua - CentOS install issue
>
>app_lua fails to install on CentOS due to the following error:
>+ make every-module group_include=klua
>CC (gcc) [M app_lua.so]         app_lua_api.o
>CC (gcc) [M app_lua.so]         app_lua_exp.o
>CC (gcc) [M app_lua.so]         app_lua_mod.o
>CC (gcc) [M app_lua.so]         app_lua_sr.o
>make[2]: `libkcore.so.1.0' is up to date.
>LD (gcc) [M app_lua.so]         app_lua.so
>/usr/bin/ld: cannot find -llua5.1
>collect2: ld returned 1 exit status
>make[1]: *** [app_lua.so] Error 1
>make: *** [modules] Error 1
>error: Bad exit status from /var/tmp/rpm-tmp.57650 (%build)
>
>
>With the attached patch, it installs ok:
>diff --git a/modules/app_lua/Makefile 
>b/modules/app_lua/Makefile index a466ab9..f703ac7 100644
>--- a/modules/app_lua/Makefile
>+++ b/modules/app_lua/Makefile
>@@ -8,7 +8,7 @@
> include ../../Makefile.defs
> auto_gen=
> NAME=app_lua.so
>-LIBS= -llua5.1
>+LIBS= -llua-5.1
>
> DEFS+=-I/usr/include/lua5.1
> DEFS+=-DOPENSER_MOD_INTERFACE
>
>
>The library is lua-5.1:
># rpm -q --list lua
>/usr/bin/lua
>/usr/bin/luac
>/usr/lib/liblua-5.1.so
>/usr/share/doc/lua-5.1.2
>/usr/share/doc/lua-5.1.2/COPYRIGHT
>/usr/share/doc/lua-5.1.2/HISTORY
>/usr/share/doc/lua-5.1.2/README
>/usr/share/doc/lua-5.1.2/amazon.gif
>/usr/share/doc/lua-5.1.2/contents.html
>/usr/share/doc/lua-5.1.2/cover.png
>/usr/share/doc/lua-5.1.2/logo.gif
>/usr/share/doc/lua-5.1.2/lua.css
>/usr/share/doc/lua-5.1.2/lua.html
>/usr/share/doc/lua-5.1.2/luac.html
>/usr/share/doc/lua-5.1.2/manual.css
>/usr/share/doc/lua-5.1.2/manual.html
>/usr/share/doc/lua-5.1.2/readme.html
>/usr/share/man/man1/lua.1.gz
>/usr/share/man/man1/luac.1.gz
>
>Most likely the above patch will break app_lua on other platform.
>We need a way to properly identify the proper lua lib that 
>needs to be passed during the linking process.
>

That will, almost certainly, break lua compilation on non-CentOS distros
as well as other platforms.

The correct way, at least on Linux (I don't personally do much
cross-platform work), is to use pkg-config to both test for the correct
version and get the linker flags.

The output on my Fedora workstation, for example:

[user at workstation]$ pkg-config --libs lua
-llua -lm -ldl
[user at workstation]$

Regards,
- Brad