checkpatch: emit an error when using predefined timestamp macros

Since commit fe7c36c7bde1 ("Makefile: Build with -Werror=date-time if
the compiler supports it"), use of __DATE__, __TIME__, and __TIMESTAMP__
has not been allowed.

As this test is gcc version specific (> 4.9), it hasn't prevented a few
new uses from creeping into the kernel sources.

Make checkpatch complain about them.

Signed-off-by: Joe Perches <joe@perches.com>
Original-patch-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f0bb6d60c07b..501c286369c9 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5089,6 +5089,12 @@ sub process {
                         }
                 }
 
+# check for uses of __DATE__, __TIME__, __TIMESTAMP__
+                while ($line =~ /\b(__(?:DATE|TIME|TIMESTAMP)__)\b/g) {
+                        ERROR("DATE_TIME",
+                              "Use of the '$1' macro makes the build non-deterministic\n" . $herecurr);
+                }
+
 # check for use of yield()
                 if ($line =~ /\byield\s*\(\s*\)/) {
                         WARN("YIELD",