bug#15678: [PATCH] compile.el: support GNU Make-4.0 directory quoting

[Jed Brown <jed@59A2.org>]

GNU Make commit 23c2b99e9d23e726 is part of make-4.0:

  Convert all "`'" quotes to "''" per new GNU Coding Standard guidelines.

This changes the output from

  make: Entering directory `/path/to/src'

to

  make: Entering directory '/path/to/src'

This patch teaches compile.el about the latter.
---
 lisp/progmodes/compile.el | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lisp/progmodes/compile.el b/lisp/progmodes/compile.el
index 3b86ddc..54f0372 100644
--- a/lisp/progmodes/compile.el
+++ b/lisp/progmodes/compile.el
@@ -513,7 +513,7 @@ listed text properties PROP# are given values VAL# as well."
   "Directory to restore to when doing `recompile'.")
 
 (defvar compilation-directory-matcher
-  '("\\(?:Entering\\|Leavin\\(g\\)\\) directory `\\(.+\\)'$" (2 . 1))
+  '("\\(?:Entering\\|Leavin\\(g\\)\\) directory [`']\\(.+\\)'$" (2 . 1))
   "A list for tracking when directories are entered or left.
 If nil, do not track directories, e.g. if all file names are absolute.  The
 first element is the REGEXP matching these messages.  It can match any number
@@ -526,7 +526,7 @@ directory we were in before the last entering message.  If you change this,
 you may also want to change `compilation-page-delimiter'.")
 
 (defvar compilation-page-delimiter
-  "^\\(?:\f\\|.*\\(?:Entering\\|Leaving\\) directory `.+'\n\\)+"
+  "^\\(?:\f\\|.*\\(?:Entering\\|Leaving\\) directory [`'].+'\n\\)+"
   "Value of `page-delimiter' in Compilation mode.")
 
 (defvar compilation-mode-font-lock-keywords
-- 
1.8.4.1