Using cmake with nginx

[Maxim Dounin]

Hello!

On Sun, Dec 04, 2022 at 11:12:55PM +0300, Dmitry Petrov wrote:

> >You may want to be more specific about issues you are talking
> about.  In general, nginx build system requires little to no
> effort from developers.
> 
> I'm speaking about manual vs automatic source-level dependency handling.
> For example, CORE_DEPS is an easy but inaccurate cross-platform hack. The
> same is true for ADDON_DEPS: if you add any header here, all addons will be
> rebuilt on that header change.
> That's not a big deal, because C compiles fast enough and ccache could be
> used to mitigate "false positives" of hand-written deps. But there's room
> for improvement for sure.
> For example, I had build issues because of forgetting to include headers
> into core/addon deps after splitting addon into a set of header/source
> files.

So, the issues you are talking about is the fact that nginx won't 
magically find out which header files you are using, but instead 
requires you to list them in the ngx_module_deps variable when 
calling the auto/module in the module config script, correct?

Thanks for the explanation.

> >There are no plans to support CMake.
> Targeting any modern C-oriented build system would add many benefits
> including "standardized" routines for library detection, dependency
> handling, etc.

The "make" build system as used by nginx is a modern, C-oriented 
build system.  Further, it is standardized, and provides as much 
portability as no other build system known.  Shell, as used to 
generate makefiles, is believed to be simple enough to implement 
any needed library detection.

> Are there any plans on adding "per-addon header deps" so changes to a
> single header don't result in all addons recompiling?

As of now, there are no such plans.  Just rebuilding all the 
modules if a header changes is believed to be fast enough 
approach.  Further, it is usually trivial to configure a build 
environment for development which does not contain any additional 
modules, reducing potential benefits from such a change.

-- 
Maxim Dounin
http://mdounin.ru/