How create static library of phalcon

It's necessary for debugging.

According to configure --help that's the right command:

./configure --help | grep static
  --enable-static=PKGS  build static libraries default=yes

I read it. But on output I'm getting phalcon.so In addition, how can I use debug for php extension?

I don't think ./configure --enable-static would create a stand-alone executable if that is what you're expecting. It will just resolve available functions that are available in compile time instead of dynamically link them in runtime.

I think you have to install PHP in debug mode, and move phalcon to the ext/ directory then add --enable-phalcon to the compilation flags when compiling PHP.

Something like:

./configure --disable-all --enable-cgi --enable-debug --enable-phalcon

You can see more info here: https://www.phpinternalsbook.com/build_system/building_php.html

Ok, phalcon work in debug mode. But i'm not seeing phalcon sources.
What i do: $gdb /usr/bin/php
$(gdb) break /acl/adapter/memory.c:573

I had not found manual how use gdb with php extension. If you know, please tell me.
Thank you.