[PATCH 7/7] Add config-compat.h override config-mycompat.h

[Brad Love <brad@nextdimension.cc>]

config-mycompat.h is for overriding macros which are incorrectly
enabled on certain kernels by the build system. The file should be
left empty, unless build errors are encountered for a kernel. The
file is removed by distclean, therefore should be externally
sourced, before the build process starts, when required.

In standard operation the file is empty, but if a particular kernel has
incorrectly enabled options defined this allows them to be undefined.

Signed-off-by: Brad Love <brad@nextdimension.cc>
---
 v4l/Makefile | 3 ++-
 v4l/compat.h | 7 +++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/v4l/Makefile b/v4l/Makefile
index 270a624..ee18d11 100644
--- a/v4l/Makefile
+++ b/v4l/Makefile
@@ -273,6 +273,7 @@ links::
 	@find ../linux/drivers/misc -name '*.[ch]' -type f -print0 | xargs -0n 255 ln -sf --target-directory=.
 
 config-compat.h:: $(obj)/.version .myconfig scripts/make_config_compat.pl
+	-touch $(obj)/config-mycompat.h
 	perl scripts/make_config_compat.pl $(SRCDIR) $(obj)/.myconfig $(obj)/config-compat.h
 
 kernel-links makelinks::
@@ -298,7 +299,7 @@ clean::
 distclean:: clean
 	-rm -f .version .*.o.flags .*.o.d *.mod.gcno Makefile.media \
 		Kconfig Kconfig.kern .config .config.cmd .myconfig \
-		.kconfig.dep
+		.kconfig.dep config-mycompat.h
 	-rm -rf .tmp_versions .tmp*.ver .tmp*.o .*.gcno .cache.mk
 	-rm -f scripts/lxdialog scripts/kconfig
 	@find .. -name '*.orig' -exec rm '{}' \;
diff --git a/v4l/compat.h b/v4l/compat.h
index 87ce401..db48fdf 100644
--- a/v4l/compat.h
+++ b/v4l/compat.h
@@ -8,6 +8,13 @@
 #include <linux/version.h>
 
 #include "config-compat.h"
+/* config-mycompat.h is for overriding #defines which
+ * are incorrectly enabled on certain kernels. The file
+ * should be left empty, unless build errors are encountered
+ * for a kernel. The file is removed by distclean, therefore
+ * should be externally sourced, before compilation, when required.
+ */
+#include "config-mycompat.h"
 
 #ifndef SZ_512
 #define SZ_512				0x00000200
-- 
2.7.4