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bug#36484: c-mode hangs on macro with comment

From: Nicholas Drozd
Subject: bug#36484: c-mode hangs on macro with comment
Date: Tue, 2 Jul 2019 19:36:52 -0500

Here's a simple C program:

#define x /***/5
int main(void) {
    return x;

`gcc -Wall` compiles it without any warnings, but opening it causes
Emacs to hang, and sometimes even to freeze hard.

It has something to do with the macro, but I haven't been able to
figure out exactly what's going on.

Here's a test function with an even smaller reproducing example:

(defun c-mode-hang ()
    (insert "#define /***/5")

Running that function under the profiler suggests that the problem is
in `c-end-of-macro`:

- c-extend-region-for-CPP          13869  98%
  - c-end-of-macro                     10470  74%
    c-forward-single-comment        2759  19%

This may have something to do with commit 39acaf, or maybe 6b5388.

GNU Emacs 27.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
of 2019-06-30

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