[PATCH] WHATSNEW: Document cross-building improvement

[Michael Adam]

Looks good!

Reviewed-by: /me

Somebody else?

On 2015-08-10 at 12:54 +0300, Uri Simchoni wrote:
> Hi,
> Pls review.
> Thanks,
> Uri

> From b021ef5ed4bd33d7e57a4d074745f65402ace214 Mon Sep 17 00:00:00 2001
> From: Uri Simchoni <urisimchoni at gmail.com>
> Date: Mon, 10 Aug 2015 12:37:09 +0300
> Subject: [PATCH] WHATSNEW: Add description of improved cross-compilation
>  support
> 
> Signed-off-by: Uri Simchoni <urisimchoni at gmail.com>
> ---
>  WHATSNEW.txt | 32 ++++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/WHATSNEW.txt b/WHATSNEW.txt
> index 33b2766..d78dc3f 100644
> --- a/WHATSNEW.txt
> +++ b/WHATSNEW.txt
> @@ -177,6 +177,38 @@ The "tls priority" option can be used to change the supported TLS
>  protocols. The default is to disable SSLv3, which is no longer
>  considered secure.
>  
> +Improved Cross-Compiling Support
> +--------------------------------
> +
> +A new "hybrid" build configuration mode is added to improve
> +cross-compilation support.
> +
> +A common challenge in cross-compilation is that of obtaining the results
> +of tests that have to run on the target, during the configuration
> +phase of the build. The Samba build system already supports the following
> +means to do so:
> +
> +  - Executing configure tests using the --cross-execute parameter
> +  - Obtaining the results from an answers file using the --cross-answers
> +    parameter
> +
> +The first method has the drawback of inaccurate results if the tests are
> +run using an emulator, or a need to be connected to a running target
> +while building, if the tests are to be run on an actual target. The
> +second method presents a challenge of figuring out the test results.
> +
> +The new hybrid mode runs the tests and records the result in an answer file.
> +To activate this mode, use both --cross-execute and --cross-answers in the
> +same configure invocation. This mode can be activated once against a
> +running target, and then the generated answers file can be used in
> +subsequent builds.
> +
> +Also supplied is an example script that can be used as the
> +cross-execute program. This script copies the test to a running target
> +and runs the test on the target, obtaining the result. The obtained
> +results are more accurate than running the test with an emulator, because
> +they reflect the exact kernel and system libraries that exist on the
> +target.
>  
>  ######################################################################
>  Changes
> -- 
> 1.9.1
> 

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