Reduce external dependencies

appelmar commented 5 years ago

Consider rewriting parts to reduce the number of external dependencies:

[x] use GDAL's VSI and CPL implementation for filesystem access instead of Boost::filesystem
[ ] check for header-only CLI tools instead of boost::program_options
[x] rewrite streaming with https://github.com/eidheim/tiny-process-library
[x] use https://github.com/HowardHinnant/date (which becomes part of std for C++20?) instead of boost::datetime
[ ] Include SQLite amalgamation (see https://www.sqlite.org/amalgamation.html) in source tree (is this really useful?)

appelmar commented 5 years ago

Boost.Date_time dependencies removed in 467c46a9d353425501cf562d4de9d4da22c66e85.

appelmar commented 5 years ago

Boost.File_system dependencies removed in edf48e0557982548b39de6bf9150886c3b621847. Streaming and swarm execution still depend on header only Boost.Process and Boost.Asio libraries, which in turn require linking to Boost.System. We avoid this by setting -DBOOST_SYSTEM_NO_DEPRECATED and -DBOOST_ERROR_CODE_HEADER_ONLY (which is not recommended).

appelmar commented 5 years ago

Since e267893d7bc51cc98f25c0eba8e7193942668fae, streaming uses https://github.com/eidheim/tiny-process-library instead of Boost.Process. Core library now does not depend on any boost library.

appelmar / gdalcubes_cpp

Reduce external dependencies #10