I am having significant trouble configuring flycheck for C++11. Right now, flycheck is flagging things like std::to_string()
. The checker I am using is just g++. What can I add in the .emacs file such that flycheck will assume C++11 by default?
Configuring Flycheck to work with C++11
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Flycheck provides the option
flycheck-gcc-language-standard
for this purpose. You should not set it globally, because that will break checking of C files, but you can set it fromc++-mode-hook
with the following code in your init file:However, I would recommend against this. Instead, use Directory Variables to configure the language standard per project.
Open the root directory of your project in Dired with
C-x d
, and then typeM-x add-dir-local-variable RET c++-mode RET flycheck-gcc-language-standard RET "c++11"
. This will create a.dir-locals.el
file in the root directory of your project. Emacs reads this file whenever you visit a file from this directory or any subdirectory, and sets variables according to the rules in this file. Specifically, Emacs will now set the language standard for Flycheck syntax checking to C++ 11 for all C++ files in your project.