[PATCH] WHATSNEW: Document cross-building improvement

[Stefan Metzmacher]

Am 14.08.2015 um 10:35 schrieb Michael Adam:
> Looks good!
> 
> Reviewed-by: /me

I've already pushed it...

metze

> 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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