How to configure flycheck (c/c++-clang) to ignore some files or directories?

Question

My C++ code use third-party library, so I have to add the library path to flycheck-clang-include-path to avoid can't find header file error.

But I don't want flycheck to do the syntax check on that library.

Because it always report warning/error on any file which include header files from that library.

I'm not sure I understand you: Do you want to use Flycheck in a C++ file that includes a header from your library while ignoring all errors and warnings from that header, or do you want to visit a file from the library without Flycheck being enabled automatically? — user227, Commented Dec 5, 2015 at 8:25
I am expecting the former one. But if the solution can do both will be great. — Enze Chi, Commented Dec 5, 2015 at 11:24
That's impossible. You cannot check a file whose includes don't pass the compiler. Includes are just textual substitutions after all; a single faulty include renders the entire file invalid. You have to configure Flycheck so that it accepts the includes without errors. — user227, Commented Dec 5, 2015 at 12:20

kintel · Accepted Answer · 2016-01-26 20:05:50Z

0

You can use the -isystem compiler option to suppress such warnings. If you're using a .dir-locals.el setup:

((c++-mode . ((flycheck-clang-args . ("-isystem/path/to/3rd-party-libs/include")))))

In this case you may need to configure that variable content as safe, e.g. in .emacs (if you trust any clang args):

(put 'flycheck-clang-args 'safe-local-variable (lambda (xx) t))

answered Jan 26, 2016 at 20:05

kintel

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