This is a small example of using module, as described there: https://quuxplusone.github.io/blog/2019/11/07/modular-hello-world/ but using build2 to handled the compilation steps.

How To Build

0. Install build2 https://build2.org/ (you might need the stage version, depends on what you want to do and if it's released yet or not)
1. Make sure you have installed at least one compiler which supports modules.
2. In this directory: b builds with the same compiler you used to install build2

• With clang: b config.cxx=clang++
• With gcc: b config.cxx=g++
• With msvc: b config.cxx=cl
• With a specific clang installed with it's version name: b config.cxx=clang++-9
• With a custom compiler (maybe one you built yourself): b config.cxx=path/to/the/cpp/compiler More about compilation with build2: https://build2.org/doc.xhtml

Beware that not all compilers support all modules features yet. For example at the moment msvc don't support modules partitions (but it's incoming).

With Libraries

A slightly more complex example is in the with_libs directory, where we have a module which is in a separate library from the executable. In this case, I use a feature provided by build2: __symexport which automatically handles symbol import/export when building a dynamic library. I also modified the original example to have the implementation of the hello function in a separate file, while still being part of the module helloworld.