[yocto] ac_cv_sizeof_long size definition by SDK

[Takashi Matsuzawa]

Hello.

I further gathered info and filed bellow.

(This is the first time I file a case against yoctoproject bugzilla, so please point me if anything is not in convention.)


https://bugzilla.yoctoproject.org/show_bug.cgi?id=10255

________________________________
From: Mark Hatle <mark.hatle at windriver.com>
Sent: Friday, September 9, 2016 11:46 PM
To: Takashi Matsuzawa; yocto at yoctoproject.org
Subject: Re: [yocto] ac_cv_sizeof_long size definition by SDK

On 9/9/16 6:33 AM, Takashi Matsuzawa wrote:
> Hello, Yocto.
>
>
> I am now puzzled by this variable ste in $CONFIG_SITE setup file in
> Yocto-generated SDK.
>
>
> I generated x86_64 host, arm (32bit) target SDK.
>
> And if I invoke $CC (arm-poky-linux-gnueabi-gcc), using this SDK, sizeof (long)
> is 4 (long = int)
>
>
> However, if I look into $CONFIG_SITE's definition of ac_cv_sizeof_long, it is
> defined as '8'.
>
> I feel this is strange since if this cached configure data is for the target
> (and cross-compiling), this value should be 4, to match the above
> (arm-poky-linux-gnueabi-gcc) result.
>
> (I think this part of the cache is being copied from poky/meta/site/x86_64-linux, )

There should be multiple caches.  There may be one for the host (nativesdk) and
one for each target (arm 32-bit).

Once you load the environment file for the arm system, the CONFIG_SITE setting
should point to the proper settings for the environment file you have loaded.

In a Power (32-bit) SDK I had laying around:

sourcing "environment-setup-powerpc-linux"

results in:

CONFIG_SITE=.../sdk/site-config-powerpc-linux

if I look at that file:

ac_cv_sizeof_long=${ac_cv_sizeof_long=4}

which is the correct value.


If this is NOT what you are seeing in your generated SDKs, and you are loading
the proper environment file, please file a defect with the Yocto Project
version, your configuration information and a way to reproduce the problem.

--Mark

>
> This is causing break if I build autotool based program using the SDK.
>
>
> Am I doing mis-use of SDK here?
>
>
>
>
>

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