Re: Debugging errors in bytecomp code?

[Philipp Stephani <p.stephani2@gmail.com>]

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Stefan Monnier <monnier@iro.umontreal.ca> schrieb am Di., 31. Jan. 2017 um
15:36 Uhr:

> > Is there a way to enter the debugger when a error in bytecomp code
> > itself is encountered? Right now, all errors including compilation ones
> > are printed to the *Compile-Log* buffer, making it impossible to get
> > a backtrace for internal compiler errors.
>
> (setq byte-compiler-debug t) ?
>
>
While there, here's a patch to document this variable:

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From 4d81eb450ef5219b551e01e7df7f08784fdc3231 Mon Sep 17 00:00:00 2001
From: Philipp Stephani <phst@google.com>
Date: Tue, 31 Jan 2017 19:04:36 +0100
Subject: [PATCH] Document variable `byte-compile-debug'

* lisp/emacs-lisp/bytecomp.el (byte-compile-debug): Document variable.
---
 lisp/emacs-lisp/bytecomp.el | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index eb3f46d3d7..2c808a5b4b 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -411,7 +411,8 @@ byte-compile-call-tree-sort
   :type '(choice (const name) (const callers) (const calls)
 		 (const calls+callers) (const nil)))
 
-(defvar byte-compile-debug nil)
+(defvar byte-compile-debug nil
+  "If non-nil, byte compile errors will be raised as signals instead of logged.")
 (defvar byte-compile-constants nil
   "List of all constants encountered during compilation of this form.")
 (defvar byte-compile-variables nil
-- 
2.11.0.483.g087da7b7c-goog