Question

I am attempting to move my module to Linux Apache 2.4 and I am having linking issues. On windows a libhttpd.lib is available to link against as well as the apr/apr-util libraries. lib* httpd apr and aprutil are all statically linked on my windows installation. I want to do the same for the Linux installation.

According to the limited documentation available I am unable to use APXS because my module is written in C++.

I am having difficulties finding the archive files for the server on Linux. What do I need to link against for my module to work?

The source is able to link and execute on a Windows host.

Sample errors:

    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:367: undefined reference to `pthread_mutexattr_init'
    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:374: undefined reference to `pthread_mutexattr_setpshared'
    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:384: undefined reference to `pthread_mutexattr_setrobust_np'
    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:393: undefined reference to `pthread_mutexattr_setprotocol'
    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:414: undefined reference to `pthread_mutexattr_destroy'
    /home/ec2-user/httpd-2.4.2/srclib/apr/locks/unix/proc_mutex.c:408: undefined reference to `pthread_mutexattr_destroy'

Thanks

Answer 1

These errors means you didn’t add -pthread to your compile command line, so you’re not getting the pthread library linked in.

(Note: it’s -pthread, not -lpthread – it’s not just a linker option.)