linux-kernel - [PATCH] Replace simple comments regarding compiler headers with preprocessor errors.

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Date:	Thu, 7 Jun 2007 11:58:30 -0400 (EDT)
From:	"Robert P. J. Day" <rpjday@...dspring.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	Andrew Morton <akpm@...l.org>
Subject: [PATCH] Replace simple comments regarding compiler headers with
 preprocessor errors.


Signed-off-by: Robert P. J. Day <rpjday@...dspring.com>

---

  never send a comment to do a preprocessor directive's job.

(note:  no one's actually doing this, so this shouldn't break any
builds.)

 include/linux/compiler-gcc.h   |    4 +++-
 include/linux/compiler-gcc3.h  |    4 +++-
 include/linux/compiler-gcc4.h  |    4 +++-
 include/linux/compiler-intel.h |    4 +++-
 4 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 03ec231..4590df2 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -1,4 +1,6 @@
-/* Never include this file directly.  Include <linux/compiler.h> instead.  */
+#ifndef _LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc.h> directly, include <linux/compiler.h> instead."
+#endif

 /*
  * Common definitions for all gcc versions go here.
diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
index a9e2863..66af0be 100644
--- a/include/linux/compiler-gcc3.h
+++ b/include/linux/compiler-gcc3.h
@@ -1,4 +1,6 @@
-/* Never include this file directly.  Include <linux/compiler.h> instead.  */
+#ifndef _LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
+#endif

 /* These definitions are for GCC v3.x.  */
 #include <linux/compiler-gcc.h>
diff --git a/include/linux/compiler-gcc4.h b/include/linux/compiler-gcc4.h
index a03e939..03ce2dd 100644
--- a/include/linux/compiler-gcc4.h
+++ b/include/linux/compiler-gcc4.h
@@ -1,4 +1,6 @@
-/* Never include this file directly.  Include <linux/compiler.h> instead.  */
+#ifndef _LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc4.h> directly, include <linux/compiler.h> instead."
+#endif

 /* These definitions are for GCC v4.x.  */
 #include <linux/compiler-gcc.h>
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
index b769961..2851a7f 100644
--- a/include/linux/compiler-intel.h
+++ b/include/linux/compiler-intel.h
@@ -1,4 +1,6 @@
-/* Never include this file directly.  Include <linux/compiler.h> instead.  */
+#ifndef _LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-intel.h> directly, include <linux/compiler.h> instead."
+#endif

 #ifdef __ECC

-- 
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

http://fsdev.net/wiki/index.php?title=Main_Page
========================================================================
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