Start testing the DMD DUB package on Travis

[wilzbach]

Supersedes #6999

Submitting this to see the list of errors we run into. The last time there has been a problem with gdc.

See also: #6771

[dlang-bot]

Thanks for your pull request, @wilzbach!

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[jacob-carlborg]

So why doesn't it find the Dub command? It works before the tests are started [1]. Are we messing with the PATH or something?

[1] https://travis-ci.org/dlang/dmd/jobs/313877077#L903

[wilzbach]

So why doesn't it find the Dub command? It works before the tests are started [1]. Are we messing with the PATH or something?

Ah because we need to explicitly load the compiler into the environment. I think this is done to ensure that the host compiler is only used in the build step and not by accident in other steps.

[wilzbach]

We are all green :)

[jacob-carlborg]

LGTM 👌.

[wilzbach]

@RazvanN7 @jacob-carlborg FYI: I managed to build a DUB package which exposes the entire frontend: #7425

[JackStouffer]

@wilzbach @mdparker BTW, has there been an article on the blog about the dub functionality? If not, we should really advertise this.

[wilzbach]

@wilzbach @mdparker BTW, has there been an article on the blog about the dub functionality?

Yes there was:

https://dlang.org/blog/2017/08/01/a-dub-case-study-compiling-dmd-as-a-library

If not, we should really advertise this.

The problem is that's still far from usable. While with #7425, it will finally be possible to run through all semantic stages with the DMD as a library package, there's still much work that needs to be done in:

• clean, modern D APIs
• overly complicated "hello world" -> add wrapper
• semantic versioning for DMD (at the moment one can only use master as other tags are "invalid semver" tags)
• Improve the easiness of writing a custom visitor (@RazvanN7 is working on this -> https://wiki.dlang.org/Projects/Visitormania)
• Introduce more structure in the DMD code base & refactorings (e.g. ddmd -> dmd transition, start to use D strings at more places) -> https://wiki.dlang.org/Projects/Libdcomp
• Provide an example project for a simple use case to get people started (e.g. a DScanner-like style check, C++ header generation, CTags/Etags output, AST XML dump, Find declaration, ...)

[jacob-carlborg]

Provide an example project for a simple use case to get people started (e.g. a DScanner-like style check, C++ header generation, CTags/Etags output, AST XML dump, Find declaration, ...)

I have started on an AST dumper, but as a debugging tool within DMD and not outputting XML.

https://github.com/jacob-carlborg/dmd/tree/ast-printer