CMake build system
--------------------------------

This branch exists for introducing CMake build system to Subversion. This
would done by adding a generator for the CMake files, based on the
'build.conf' file.

This was discussed on dev@ mailing list and archived at [1].


                      How to use
--------------------------------

```
# Run gen-make.py to generate the CMake files.
$ ./gen-make.py -t cmake

# Configure CMake cache. CMAKE_PREFIX_PATH is a directory, where the
# dependencies are installed in. You may pass any additional options
# to the configure command.
$ cmake -B out -DCMAKE_PREFIX_PATH=/path/to/deps

# Finally, build!
$ cmake --build out
```


                            TODO
--------------------------------

- [x] Create empty CMakeLists.txt
- [x] Commit the initial patch from the thread [1]
- [ ] Tests
  - [x] C tests
  - [ ] Python tests on command-line
  - [ ] Different options and configuration
- [ ] Cross platform support
  - [~] Support compilation for Linux
  - [~] Support compilation for MacOS
  - [~] Support compilation for FreeBSD
  - [ ] Support compilation for NetBSD
  - [ ] Support compilation for OpenBSD
  - [ ] Support compilation for other Unix (?)
- [ ] Support optional libraries
  - [x] Serf
  - [ ] HTTPD
- [ ] Bindings
  - [ ] Swig
  - [ ] JavaHL
- [ ] Documentation
  - [x] INSTALL
  - [ ] Website page (?)

                      References
--------------------------------

[1] https://lists.apache.org/thread/66lf0c5oyzyhfss6qzmtkb3v866y4dts