[U-Boot] [PATCH v3] Move timestamp and version files into 'generated' subdir

[Simon Glass]

There is a rather subtle build problem where the build time stamp is not
updated for out-of-tree builds if there exists an in-tree build which
has a valid timestamp file. So if you do an in-tree build, then an
out-of-tree build your timestamp will not change.

The correct timestamp_autogenerated.h lives in the object tree, but it
is not always found there. The source still lives in the source tree and
when compiling version.h, it includes timestamp_autogenerated.h. Since
the current directory is always searched first, this will come from the
source tree rather than the object tree if it exists there. This affects
dependency generation also, which means that common/cmd_version.o will not
even be rebuilt if you have ever done an in-tree build.

A similar problem exists with the version file.

This change moves both files into the 'generated' subdir, which is already
used for asm-offsets.h. Then timestamp.h and version.h are updated to
include the files from there.

There are other places where these generated files are included, but I
cannot see why these don't just use the timestamp.h and version.h headers.
So this change also tidies that up.

I have tested this with in- and out-of-tree builds, but not SPL. I have
looked at various other options for fixing this, including sed on the dep
files, -I- and -include flags to gcc, but I don't think they can be made
to work. Comments welcome.

Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2:
- Remove {timestamp,version}_autogenerated.h from include/.gitignore

Changes in v3:
- Rebase to master: a recent commit has tidied up one part of this patch

 Makefile                                  |    4 ++--
 arch/arm/cpu/armv7/omap-common/spl.c      |    3 +--
 arch/arm/cpu/armv7/omap-common/spl_mmc.c  |    3 +--
 arch/arm/cpu/armv7/omap-common/spl_nand.c |    3 +--
 drivers/serial/usbtty.h                   |    2 +-
 include/.gitignore                        |    2 --
 include/timestamp.h                       |    2 +-
 include/version.h                         |    2 +-
 8 files changed, 8 insertions(+), 13 deletions(-)

diff --git a/Makefile b/Makefile
index 5db2e0e..dd59922 100644
--- a/Makefile
+++ b/Makefile
@@ -30,8 +30,8 @@ U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
 else
 U_BOOT_VERSION = $(VERSION).$(PATCHLEVEL)$(EXTRAVERSION)
 endif
-TIMESTAMP_FILE = $(obj)include/timestamp_autogenerated.h
-VERSION_FILE = $(obj)include/version_autogenerated.h
+TIMESTAMP_FILE = $(obj)include/generated/timestamp_autogenerated.h
+VERSION_FILE = $(obj)include/generated/version_autogenerated.h
 
 HOSTARCH := $(shell uname -m | \
 	sed -e s/i.86/x86/ \
diff --git a/arch/arm/cpu/armv7/omap-common/spl.c b/arch/arm/cpu/armv7/omap-common/spl.c
index c76fea6..01fd58a 100644
--- a/arch/arm/cpu/armv7/omap-common/spl.c
+++ b/arch/arm/cpu/armv7/omap-common/spl.c
@@ -29,8 +29,7 @@
 #include <nand.h>
 #include <mmc.h>
 #include <fat.h>
-#include <timestamp_autogenerated.h>
-#include <version_autogenerated.h>
+#include <version.h>
 #include <asm/omap_common.h>
 #include <asm/arch/mmc_host_def.h>
 #include <i2c.h>
diff --git a/arch/arm/cpu/armv7/omap-common/spl_mmc.c b/arch/arm/cpu/armv7/omap-common/spl_mmc.c
index 1d1e50c..6f5b43e 100644
--- a/arch/arm/cpu/armv7/omap-common/spl_mmc.c
+++ b/arch/arm/cpu/armv7/omap-common/spl_mmc.c
@@ -28,8 +28,7 @@
 #include <asm/arch/sys_proto.h>
 #include <mmc.h>
 #include <fat.h>
-#include <timestamp_autogenerated.h>
-#include <version_autogenerated.h>
+#include <version.h>
 #include <asm/omap_common.h>
 #include <asm/arch/mmc_host_def.h>
 
diff --git a/arch/arm/cpu/armv7/omap-common/spl_nand.c b/arch/arm/cpu/armv7/omap-common/spl_nand.c
index af02a59..38d06b1 100644
--- a/arch/arm/cpu/armv7/omap-common/spl_nand.c
+++ b/arch/arm/cpu/armv7/omap-common/spl_nand.c
@@ -25,8 +25,7 @@
 #include <asm/utils.h>
 #include <asm/arch/sys_proto.h>
 #include <nand.h>
-#include <timestamp_autogenerated.h>
-#include <version_autogenerated.h>
+#include <version.h>
 #include <asm/omap_common.h>
 
 
diff --git a/drivers/serial/usbtty.h b/drivers/serial/usbtty.h
index a23169a..14961c1 100644
--- a/drivers/serial/usbtty.h
+++ b/drivers/serial/usbtty.h
@@ -37,7 +37,7 @@
 #include <usb/spr_udc.h>
 #endif
 
-#include <version_autogenerated.h>
+#include <version.h>
 
 /* If no VendorID/ProductID is defined in config.h, pretend to be Linux
  * DO NOT Reuse this Vendor/Product setup with protocol incompatible devices */
diff --git a/include/.gitignore b/include/.gitignore
index 77594e5..ec224c5 100644
--- a/include/.gitignore
+++ b/include/.gitignore
@@ -3,5 +3,3 @@
 /bmp_logo.h
 /config.h
 /config.mk
-/timestamp_autogenerated.h
-/version_autogenerated.h
diff --git a/include/timestamp.h b/include/timestamp.h
index b2f4cf4..05a6658 100644
--- a/include/timestamp.h
+++ b/include/timestamp.h
@@ -24,7 +24,7 @@
 #define	__TIMESTAMP_H__
 
 #ifndef DO_DEPS_ONLY
-#include "timestamp_autogenerated.h"
+#include "generated/timestamp_autogenerated.h"
 #endif
 
 #endif	/* __TIMESTAMP_H__ */
diff --git a/include/version.h b/include/version.h
index 129acef..c908bd3 100644
--- a/include/version.h
+++ b/include/version.h
@@ -27,7 +27,7 @@
 #include <timestamp.h>
 
 #ifndef DO_DEPS_ONLY
-#include "version_autogenerated.h"
+#include "generated/version_autogenerated.h"
 #endif
 
 #ifndef CONFIG_IDENT_STRING
-- 
1.7.3.1