[RFA/NEWS] Document --enable-libmcheck/--disable-libmcheck

[Joel Brobecker <brobecker@adacore.com>]

Hello,

I just checked in a patch that expands the list of configure options
for GDB, and it's only after pushing the patch that I realized that
a NEWS entry should probably be added. Here it is.

gdb/ChangeLog:

        * NEWS: Document new --enable-libmcheck/--disable-libmcheck
        configure options.


---
 gdb/NEWS |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/gdb/NEWS b/gdb/NEWS
index 4da886c..a590bee 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -3,6 +3,15 @@
 
 *** Changes since GDB 7.5
 
+* New configure options
+
+--enable-libmcheck/--disable-libmcheck
+  By default, development versions are built with -lmcheck on hosts
+  that support it, in order to help track memory corruption issues.
+  Release versions, on the other hand, are built without -lmcheck
+  by default.  The --enable-libmcheck/--disable-libmcheck configure
+  options allow the user to override that default.
+
 * New commands (for set/show, see "New options" below)
 
 maint info bfds
-- 
1.7.1