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bug#36484: c-mode hangs on macro with comment
From: |
Alan Mackenzie |
Subject: |
bug#36484: c-mode hangs on macro with comment |
Date: |
4 Jul 2019 10:36:20 -0000 |
User-agent: |
tin/2.4.2-20171224 ("Lochhead") (UNIX) (FreeBSD/11.2-RELEASE-p9 (amd64)) |
Hello, Nicholas.
In article <mailman.43.1562114299.2688.bug-gnu-emacs@gnu.org> you wrote:
> 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.
I can reproduce this, and I'm looking into the cause.
> 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 ()
> (interactive)
> (with-temp-buffer
> (insert "#define /***/5")
> (c-mode)))
> 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%
Thanks, that's helpful information.
> 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
--
Alan Mackenzie (Nuremberg, Germany).