[PATCH] tools: Remove #include <version.h>

[Tom Rini]

On Wed, Jan 27, 2021 at 04:34:24PM +0100, Pali Rohár wrote:

> Header file version.h includes also autogenerated file timestamp.h which
> is recompiled on every time when SOURCE_DATE_EPOCH change.
> 
> Tools do not use build time therefore they do not have to include
> timestamp.h file.
> 
> This change prevents recompiling tools every time when SOURCE_DATE_EPOCH
> changes.
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>
> ---
>  tools/dumpimage.c  | 2 +-
>  tools/mkenvimage.c | 2 +-
>  tools/mkimage.c    | 2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/dumpimage.c b/tools/dumpimage.c
> index e5481435a7..54c2517c9e 100644
> --- a/tools/dumpimage.c
> +++ b/tools/dumpimage.c
> @@ -7,7 +7,7 @@
>  
>  #include "dumpimage.h"
>  #include <image.h>
> -#include <version.h>
> +#include "generated/version_autogenerated.h"
>  
>  static void usage(void);
>  

I don't know if I really like this approach.  It also seems inconsistent
as we have for example tools/fit-image.c that has content from
generated/version_autogenerated.h but wasn't changed by this patch (nor
the rest of the series).

I think a bit more invasive approach is required here.  I like the
<version_string.h> approach you used elsewhere, and as best I can see,
the only place U_BOOT_VERSION_STRING, which is where we have the
timestamp itself, is used is cmd/version.c (and defined in version.h).
We should isolate the file that has the date such that it's only
in one file and referenced in one file.  This means probably removing
the version_string global from arch/{powerpc,m68k} and dropping __weak
from cmd/version.c and seeing what happens, as well.

Do you see where I'm thinking with this, or do I need to try and explain
a bit more?  Thanks!

-- 
Tom
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