c++-rtags Spacemacs layer

This layer augments C++ support provided by Spacemacs` c-c++ layer.

Features

Adds rtags package for basic RTags support
Adds company-rtags package for RTags-powered completion
Adds flycheck-rtags for checking C++ code with RTags
Adds helm-rtags for Helm integration
Ensures RTags daemon (rdm) is started via cmake-ide-maybe-start-rdm
Enables completion (via company) and linting (via adding a checker to and replacing flycheck highligher) in C/C++ modes

Simply clone the repository into your emacs.d private directory:

git clone https://github.com/kzemek/cpp-rtags-layer ~/.emacs.d/private/c++-rtags

and enable the layer in ~/.spacemacs along with c-c++ (without clang support):

...
dotspacemacs-configuration-layers
'( ...
c-c++
c++-rtags
...
)
...

If your c-c++ layer doesn't include cmake-ide support you may additionally need to fetch it from develop branch:

cd~/.emacs.d && git fetch && git checkout origin/develop layers/+lang/c-c++/

Install rtags
- on macOS this step is as simple as brew install rtags
Set up .dir-locals.el
Create compile_commands.json in your build directory
- for CMake projects it's enough to add -DCMAKE_EXPORT_COMPILE_COMMANDS=ON to cmake invocation

Key Binding	Description
`C <tab>`	Forces showing completions on current point (`company-complete`)
`, g g`	Jumps to symbol definition (using RTags)
`, g f`	Apply Clang fixit
`C-c r`	Various `rtags` functions