Some bugs or questions about C-C++ layer

[jcppython]

Here is my configuration

emacs-version
GNU Emacs 24.4.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.10.8)

1. The "SPC m" is undefined when I open a C/C++ header file.
   In addition, the illustration of “Key Bindings” part has some wrongs in C-C++.
   https://github.com/fenxian/spacemacs/blob/master/layers/+lang/c-c++/README.org

2. It can't find the C++ headers.
   
   I need to configure it?

3. An unfriendly tip as shown in following:
   

   And, the code is right. In other words, this tip shouldn't exist in here.
   In addition, how to open a header file? command or key binding?

4. Can you give me more information about how to scan a big C/C++ project with spacemacs?
   For example, how to configure it for my project?
   How to jump to the definition of references?

Thank you~

[tuhdo]

1. It's strange. If you enabled semantic layer, at least SPC m r should be available to access srefactor's menu.
2. For C++ header files, you must add your C++ header paths to the variable company-c-headers-path-system for it to complete. Something like this:

(add-to-list 'company-c-headers-path-system "/usr/include/c++/4.8/" )

Because it's is system-specific, we cannot preconfigured it.

1. As for the error message, probably it cannot find the header file. You might try adding project include paths for your C++ using the variable flycheck-clang-include-path.
2. To jump around C++ source code, you can either use the gtags layer (after adding the layer, some SPC m key bindings for gtags should be available. Use the command helm-gtags-create-tags to generate a tag database at your project root. Then, you will be able to jump to definitions and find references.

[jcppython]

1. 

Sorry, SPC m is undefined occuring some times. This situation is incidental...
You can see that: I type SPC m g c to create gtags .. .
You can try to SPC m when you open a C/C++ file immediately after you start spacemacs.

1. Where is better place to add the following codes? dotspacemacs/user-config () ?

  (add-to-list 'company-c-headers-path-system "/usr/include/c++/4.8/" )

May be we can add a variable to configure it when we enable C-C++ layer?

2. What is different between flycheck-clang-include-path and company-c-headers-path-system / company-c-headers-usr-system?
   Do I should to add project include paths into company-c-headers-usr-system?
3. I have jump operations when SPC m is available. I have another question:
   Could we can create tha gtags file into another folder? Because the project belong to a big team sometimes. I can't to write files into the root of project at that time.

[TheBB]

Are your packages updated? How old is your bind-map package?

[jcppython]

elpa/bind-map-20151217.829/..

I think it should be the latest. I install the spacemacs yesterday.

[TheBB]

Yeah ok, it's not that then. Can I try your dotfile?

[jcppython]

@TheBB dotfile refers to .spacemacs? It only have a little changes in this file.
spacemacs.txt

[TheBB]

Okay, I tried with your dotfile (except I had to remove the chinese layer), and SPC m works fine for me in C++ mode.

[jcppython]

Yeah, It seems chinese layer leads to this issue.
Then, I will have to remove chinese layer? ...

[TheBB]

Really? It works without the chinese layer?

[jcppython]

Sorry, I try to operate it more times. The problem still exist after I comment chinese layer.
In addition, I find that SPC m can work after I have some other operations, for example, gg and G.

ps: SPC m works fine in other major-mode, for example, org-mode.

Can you give more methods to debug it? Or, Do you need some other information?

[tshu-w]

@jcppython I have the same issues with you. Have you fixed this problems?

[tshu-w]

@TheBB Hi, I have the same issues that can't find the C++ headers.
Here is the problem that whether I set c-c++-default-mode-for-headers 'c++-mode or not company-c-headers find header files at /usr/include, but should be at /usr/include/c++/4.2.1.What should I set in my .spacemacs?

[delaanthonio]

@Voleking Do you have clang support enabled? If you do, create a .clang_complete file in the root of your project. Add the flag -I/usr/include/c++/4.2.1 to the beginning of the .clang_complete file. Otherwise, try adding (add-to-list 'company-c-headers-path-system "/usr/include/c++/4.2.1") to your .spacemacs.

[syl20bnr]

May be fixed in develop after #9381 is merged.

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