How can I get Emacs to indent my // comments with my code?

Question

I don't know much about Emacs, but after some googling, I edited my .emacs file to be as follows:

(setq c-default-style "bsd" c-basic-offset 4)

My goal was to get Allman-style indenting with 4-spaced tabs. It works as expected, but now my // comments aren't indented with my code. Before I changed this, when I would type //, it would get auto-indented to be in line with the rest of the code in the function. How can I get Emacs to auto-indent // comments?

I've tried adding c-indent-comments-syntactically-p 1 to the above .emacs file, but that didn't change it...

For example:

int main()
{
    // I'd like this line to be auto-indented to match the block
    for (int i = 0; i < 10; ++i)
    {
        // And this line to be auto-indented to match the block
        doStuff();
    }
}

Currently, TAB does not indent my // comment, and it doesn't automatically indent either.

Answer 1

You can inspect and change the value of the current indent by placing point on the concerned line and pressing C-c C-o. Adjust the relevant symbols to your liking.

This wont be permanent. Use direct invocation of the function c-set-offset in your .emacs to make the changes globally.

Simple example:

int main() {
  // 
}

This is my default indent. After moving the cursor to line 2 I see that the relevant symbol is comment-intro.

Using:

(c-set-offset 'comment-intro 6)

I get:

int main() {
        //
}

Offset accumulates across symbols:

int main() {
        //
  {
          //
  }
}