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Include header from a linked folder [message #1712197]

Wed, 21 October 2015 21:02

Marcus Santo

Messages: 8
Registered: October 2014

Junior Member

Hi,
Why files in linked folder cannot be included?

I have a project, B, whos files are located in the git directory and another A project in the workspace. In the project A, I create a new linked folder to the project B. In A, I have a main.cpp file where I include a file from B

#include "B/file.ext"

I also tried to linked folder as source folder and checked the project B in the Project References menu of the project A.

EDIT: I also tried to include a project from the same workspace but also doing so doesn't work.

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Re: Include header from a linked folder [message #1712268 is a reply to message #1712197]

Thu, 22 October 2015 14:07

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

The makefile is run in your workspace A but A itself doesn't have B so any reference to B will be unresolved. You will need more path information before using B that will find what you are looking for relative to wherever A is physically located. So, it either has to be in the include itself or a path to B has to be given to the compiler (GCC?) often with -I<path>. You don't say who is generating the make file or what you are using to compile/link. Remember, the compiler doesn't know anything about Eclipse. How you tell it where those files are depends on what you are doing and who is generating the make files, etc.

In fact it looks like what you have wouldn't work even if you had complete path information to B as the .hpp files seem to be in B/src (or is it A/src? -- not sure which is A and B in your image).

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Re: Include header from a linked folder [message #1712270 is a reply to message #1712268]

Thu, 22 October 2015 14:37

Marcus Santo

Messages: 8
Registered: October 2014

Junior Member

I'm using CDT Internal Builder.
In the project A (test) I created a linked folder to project B (tree/src).
Yes, I knew I can include it in the include path but imagine I had many related projects that I want to link each other. Using include path would quickly become unmanageable.

Thank you for the answer.

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Re: Include header from a linked folder [message #1712274 is a reply to message #1712270]

Thu, 22 October 2015 14:59

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

Think about the difficulty in automating this. I've seen many different placement of header files over the years. In the source directory or in folders named inc, include, hdr, header. Not often, but I've seen combinations of them used concurrently. In your image it looks like you have a directory named "tree.hpp". Does it also contain headers? Asking CDT to figure out which directories you intend to use for your headers is asking a lot.

What you could do perhaps is have a directory somewhere that contains links to your projects so you only need to add a single link to each project. Or, you could separate out the header folders as separate projects as suggested here: http://www.eclipse.org/forums/index.php/mv/msg/68594/215191/#msg_215191

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Re: Include header from a linked folder [message #1745103 is a reply to message #1712274]

Wed, 05 October 2016 08:38

Lloyd Elliott

Messages: 1
Registered: October 2016

Junior Member

So, what's the best practice for solving this? TBH I'm sort of surprised I can't #include "src/test.hpp" given that "src" is a subfolders (albiet linked) of the directory in which my translation unit resides. If I were specifying eclipse, I'd make linked subfolders turn into soft links at compile time, that strikes me as the least surprising behaviour.

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Re: Include header from a linked folder [message #1745172 is a reply to message #1745103]

Thu, 06 October 2016 00:06

David Vavra

Messages: 1426
Registered: October 2012

Senior Member

First, you should understand that there is no such thing as an objective best. Everything depends on requirements.
Discussions of this nature lead to arguments and/or meandering posts.

What I have done is create a LOCALLIB project and use it as en external library in all the others.
Whether that is suitable for your purposes I can't say. YMMV and all that.

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