Make compilation-mode regexp matching case-sensitive (bug#40119)

The number of regexps is large, they are written independently of one
another, and they frequently intersect.  Using case-sensitive matching
improves separation and performance, and is probably what everyone
have being assuming was used by compilation-mode all along.

* lisp/progmodes/compile.el (compilation-error-case-fold-search): New.
(compilation-parse-errors): Bind case-fold-search to
compilation-error-case-fold-search during matching.
* etc/NEWS: Announce.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 1be5ad6acc0..910d9fa2d23 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -196,6 +196,12 @@ key             binding
 *** New user option 'gravatar-service' for host to query for gravatars.
 Defaults to Libravatar, with Unicornify and Gravatar as options.
 
+** Compilation mode
+
+*** Regexp matching of messages is now case-sensitive by default.
+The user option 'compilation-error-case-fold-search' can be set
+for case-insensitive matching of messages.
+
 
 * New Modes and Packages in Emacs 28.1