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[PATCH] deprecate the --mmap option
From: |
Jim Meyering |
Subject: |
[PATCH] deprecate the --mmap option |
Date: |
Tue, 03 Jan 2012 12:10:18 +0100 |
I've dealt with this FIXME:
/* FIXME: disabled in Mar 2010; warn towards end of 2011; remove in 2013. */
{"mmap", no_argument, NULL, MMAP_OPTION},
>From bb05967befa6a8cf172cbcbe64115e2f0813766c Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Tue, 3 Jan 2012 12:01:51 +0100
Subject: [PATCH] deprecate the --mmap option
* src/main.c (main): Deprecate the --mmap option: issue a warning
when it is used.
(usage): Change description.
* doc/grep.texi (Other Options): Document the new behavior.
* NEWS (Changes in behavior): Mention it.
---
NEWS | 6 ++++++
doc/grep.texi | 3 ++-
src/main.c | 5 ++++-
3 files changed, 12 insertions(+), 2 deletions(-)
diff --git a/NEWS b/NEWS
index 9efb82a..0fd6039 100644
--- a/NEWS
+++ b/NEWS
@@ -40,6 +40,12 @@ GNU grep NEWS -*- outline
-*-
grep now supports color highlighting of matches on MS-Windows.
+** Changes in behavior
+
+ Use of the --mmap option now elicits a warning. It has been a no-op
+ since March of 2010.
+
+
* Noteworthy changes in release 2.10 (2011-11-16) [stable]
** Bug fixes
diff --git a/doc/grep.texi b/doc/grep.texi
index 537237f..5d779c1 100644
--- a/doc/grep.texi
+++ b/doc/grep.texi
@@ -689,7 +689,8 @@ This can cause a performance penalty.
@item --mmap
@opindex --mmap
@cindex memory mapped input
-This option is ignored for backwards compatibility. It used to read
+This option is deprecated and now elicits a warning, but is otherwise a no-op.
+It used to make @command{grep} read
input with the @code{mmap} system call, instead of the default @code{read}
system call. On modern systems, @code{mmap} would rarely if ever yield
better performance.
diff --git a/src/main.c b/src/main.c
index a768d36..a738050 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1465,7 +1465,7 @@ Miscellaneous:\n\
-v, --invert-match select non-matching lines\n\
-V, --version print version information and exit\n\
--help display this help and exit\n\
- --mmap ignored for backwards compatibility\n"));
+ --mmap deprecated no-op; evokes a warning\n"));
printf (_("\
\n\
Output control:\n\
@@ -2121,6 +2121,9 @@ main (int argc, char **argv)
break;
case MMAP_OPTION:
+ error (0, 0, _("the --mmap option has been a no-op since 2010"));
+ break;
+
case 0:
/* long options */
break;
--
1.7.8.1.391.g2c2ad
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