Re: [uml-devel] [uml-user] Building from source problems and possibilities

[Richard Weinberger]

On Fri, Oct 30, 2015 at 5:02 PM, Balaco Baco  wrote:
> I restarted, now I've got another kernel source (2.6.32.68), knowing
> that it may be old, but it's the "newer old" for 2.6, and I hoped that
> it would work.

Are you an archeologist? ;-)
Is there a particular reason why you can't use something recent?

> Steps done:
>
> 1. downloaded https://cdn. kernel
> .org/pub/linux/kernel/v2.6/longterm/v2.6.32/linux-2.6.32.68.tar.xz
> 2. extract with tar cJf (whatever)
> 3. A few commands:
> make defconfig ARCH=um
> # config is saved on a file, to be restarted from a known point
> whenever needed
> make menuconfig ARCH=um
> make mrproper# zero start guarantee when
> repeating these steps
> make mrproper ARCH=um   #  "
> make ARCH=uml
>
> 4. It stops a few seconds after, with a few errors that may be simple to
> fix:
>
> ===
> arch/um/os-Linux/start_up.c: In function 'check_coredump_limit':
> arch/um/os-Linux/start_up.c:340:16: error: storage size of 'lim' isn't
> known
>   struct rlimit lim;
> ^
> arch/um/os-Linux/start_up.c:341:2: error: implicit declaration of
> function 'getrlimit' [-Werror=implicit-function-declaration]
>   int err = getrlimit(RLIMIT_CORE, );
>   ^
> arch/um/os-Linux/start_up.c:341:22: error: 'RLIMIT_CORE' undeclared
> (first use in this function)
>   int err = getrlimit(RLIMIT_CORE, );
>   ^
> arch/um/os-Linux/start_up.c:341:22: note: each undeclared identifier is
> reported only once for each function it appears in
> arch/um/os-Linux/start_up.c:349:22: error: 'RLIM_INFINITY' undeclared
> (first use in this function)
>   if (lim.rlim_cur == RLIM_INFINITY)
>   ^
> arch/um/os-Linux/start_up.c:340:16: warning: unused variable 'lim'
> [-Wunused-variable]
>   struct rlimit lim;
> ^
> cc1: some warnings being treated as errors
> make[1]: *** [arch/um/os-Linux/start_up.o] Error 1
> make: *** [arch/um/os-Linux] Error 2
>
> ===
>
> Do you know the reason for these two errors? And how I should fix them?

It depends what libc you're using. AFAICT libc moved a header file to
a new location.

-- 
Thanks,
//richard

--
___
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] [uml-user] Building from source problems and possibilities

[Richard Weinberger]

On Fri, Oct 30, 2015 at 8:30 PM, Richard Weinberger
 wrote:
> On Fri, Oct 30, 2015 at 5:02 PM, Balaco Baco  wrote:
>> I restarted, now I've got another kernel source (2.6.32.68), knowing
>> that it may be old, but it's the "newer old" for 2.6, and I hoped that
>> it would work.
>
> Are you an archeologist? ;-)
> Is there a particular reason why you can't use something recent?
>
>> Steps done:
>>
>> 1. downloaded https://cdn. kernel
>> .org/pub/linux/kernel/v2.6/longterm/v2.6.32/linux-2.6.32.68.tar.xz
>> 2. extract with tar cJf (whatever)
>> 3. A few commands:
>> make defconfig ARCH=um
>> # config is saved on a file, to be restarted from a known point
>> whenever needed
>> make menuconfig ARCH=um
>> make mrproper# zero start guarantee when
>> repeating these steps
>> make mrproper ARCH=um   #  "
>> make ARCH=uml
>>
>> 4. It stops a few seconds after, with a few errors that may be simple to
>> fix:
>>
>> ===
>> arch/um/os-Linux/start_up.c: In function 'check_coredump_limit':
>> arch/um/os-Linux/start_up.c:340:16: error: storage size of 'lim' isn't
>> known
>>   struct rlimit lim;
>> ^
>> arch/um/os-Linux/start_up.c:341:2: error: implicit declaration of
>> function 'getrlimit' [-Werror=implicit-function-declaration]
>>   int err = getrlimit(RLIMIT_CORE, );
>>   ^
>> arch/um/os-Linux/start_up.c:341:22: error: 'RLIMIT_CORE' undeclared
>> (first use in this function)
>>   int err = getrlimit(RLIMIT_CORE, );
>>   ^
>> arch/um/os-Linux/start_up.c:341:22: note: each undeclared identifier is
>> reported only once for each function it appears in
>> arch/um/os-Linux/start_up.c:349:22: error: 'RLIM_INFINITY' undeclared
>> (first use in this function)
>>   if (lim.rlim_cur == RLIM_INFINITY)
>>   ^
>> arch/um/os-Linux/start_up.c:340:16: warning: unused variable 'lim'
>> [-Wunused-variable]
>>   struct rlimit lim;
>> ^
>> cc1: some warnings being treated as errors
>> make[1]: *** [arch/um/os-Linux/start_up.o] Error 1
>> make: *** [arch/um/os-Linux] Error 2
>>
>> ===
>>
>> Do you know the reason for these two errors? And how I should fix them?
>
> It depends what libc you're using. AFAICT libc moved a header file to
> a new location.

Can you please verify whether this commit fixes the issue?
commit fdfa4c952844fce881df8c76de9c7180cbe913ab
Author: Sergei Trofimovich 
Date:   Sun Dec 30 01:37:30 2012 +0300

um: add missing declaration of 'getrlimit()' and friends

If so, we only need to figure why it wasn't backported.

-- 
Thanks,
//richard

--
___
User-mode-linux-devel mailing list
User-mode-linux-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel