Re: Semantic mode for c++

[Bastian Beischer]

Hey,

I guess the problem is that the semantic lexer does not set the correct
preprocessor macros when lexing the STL include files. In particular, to
set the C++ standard version, one has to set the __cplusplus macro to a
particular value. The compiler does this automatically for you when you
compile with -std=XXX, but semantic does not know anything about this
compiler flag.

You can customize the macro definitions used in semantic in the variable
"semantic-lex-c-preprocessor-symbol-map".

However, I don't think semantic currently supports all the new C++11 and
above keywords which have entered the language when parsing code, so you
might get mixed results.

Cheers
Bastian

On Mon, Jun 26, 2017 at 2:34 PM, Gabriele Labita <gabriele.labita@gmail.com>
wrote:

> Hi,
> I'm trying to configure semantic module to have auto completion for c++ in
> emacs.
> I put this code on .emacs file:
>
> ```
>  (add-hook 'c-mode-common-hook
>        '(lambda () (load (concat custom-config-path
> "custom-config-c++.el")))
> )
>  ```
>
> And this is my custom-config-c++.el file:
> ```
> (add-to-list 'semantic-default-submodes 'global-semantic-idle-schedule
> r-mode)
> (add-to-list 'semantic-default-submodes 'global-semantic-idle-completi
> ons-mode)
> (add-to-list 'semantic-default-submodes 'global-semantic-idle-summary-
> mode)
> (add-to-list 'semantic-default-submodes 'global-semanticdb-minor-mode)
> (add-to-list 'semantic-default-submodes 'global-semantic-show-parser-s
> tate-mode)
> (add-to-list 'semantic-default-submodes 'global-semantic-show-unmatche
> d-syntax-mode)
>
> (semantic-mode 1)
>
> (require 'semantic/ia)
> (require 'semantic/bovine/gcc)
>
> (semanticdb-enable-gnu-global-databases 'c++-mode)
>
> (global-ede-mode t)
>
> (global-flycheck-mode t)
> (setq flycheck-gcc-language-standard "c++14")
> ;; To add library use follow command:
> ;;   > flycheck-pkg-config
>
> ;; 70 Columns RULE
> (require 'whitespace)
> (setq whitespace-line-column 71)
> (setq whitespace-style '(face lines-tail))
>
> (global-whitespace-mode +1)
>  ```
>
> It works well but I've a annoying problem: when I use the command:
> 'semantic-ia-complete-symbol' on 'std::', the semantic db is created in the
> .emacs.d/semanticdb/ folder. The problem is that the created db refers to
> c++98 instead of c++14. For example: when auto complete smart pointers, I
> find the "auto_ptr" suggestion and not "unique_ptr" or "shared_ptr".
> How can I generate the right db?
>
> More Infos:
> - Debian 9 amd 64
> - gcc 6.3.0
> - Emacs 24.5.1
> - global 6.5.6
>
>


-- 
Bastian Beischer
RWTH Aachen University of Technology

@RWTH Aachen
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E-mail: beischer@physik.rwth-aachen.de
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@CERN
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