[SOLVED] How to compile apache module with included sds library using apxs2

How to compile apache module with included sds library using apxs2

I get example apache2 module here:

https://httpd.apache.org/docs/2.4/developer/modguide.html

and I want to use there this sds library https://github.com/antirez/sds

So I will create new module and goto module dir:

apxs -g -n mymodule
cd mod_mymodule

add on line 44 of mod_mymodule.c:

#include "sds.h"

and into the mymodule_handler on line 49 I will add

sds a = sdsnew("a");
sds b = sdsnew("b");
if (sdscmp(a, b) == 0) 
    return (DECLINED);

I also put library files (sds.c, sds.h, sdsalloc.h) into the same directory as my module source code file and then I will call:

sudo apxs -i -a -c mod_mymodule.c

Then I will restart apache, but it fails to start because of:

apache2: Syntax error on line 146 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/mymodule.load: Cannot load /usr/lib/apache2/modules/mod_mymodule.so into server: /usr/lib/apache2/modules/mod_mymodule.so: undefined symbol: sdscmp

Question: How can I modify apxs command to make my new module work with included library?

Solution

If you want to link them together into your module, you'd pass in all the .c files. Keep the one that's a module first otherwise you have to also pass -n for the module name.

If "sds" were instead an installed library, you'd pass -lsds to apxs just as you would to compiple without apxs.