Fwd: RV: Math module not compiling

Hi Rathin,

I have been facing similar issues with a 32 bit Linux lately...

I am using RTAI 4.1 and Ubuntu 14.04 32 bit and the glibc-libm that comes
with Ubuntu doesn't work. It seems that the i386 glibc-libm from Ubuntu is
not suitable for this new math library support and need and alternative way
like in the x86_64.

I decided to use newlib and after struggling a little bit with the building
process I ended up building newlib with the following configure options:

./configure  --disable-shared --disable-multilib --with-newlib
--host=i386-pc-sysv

In order to build RTAI you might need to get the "export_newlib.h" file
from RTAI CVS and copy to your rtai/base/math directory:

Regards,

Asier.



De: Rtai [mailto:[email protected]] En nombre de Doug Renton
Enviado el: lunes, 11 de enero de 2016 20:48
Para: Rathin Dholakia
CC: [email protected]
Asunto: Re: [Rtai] Math module not compiling

Are you using 32 bit Linux?? If so that is a difference, I use 64bit. I
suspect there are serious differences between the two. I would re-install
with 64 bit linux. I use openSUSE, no troubles..

On 64 bit you need newlib first.
I just followed Jan's directions. I looked at my "notes" and it is cut and
paste from Jan's email


**********************************************************
Jan @ cut out address...
Wed Oct 8 15:17:08 CEST 2014


We just had this discussion...

Download the latest RTAI version from CVS or from github:
git clone https://github.com/ShabbyX/RTAI.git

Read the file
base/math/README.KLIBM

On a 64bit system you might want to install newlib:

cd /usr/local/src
mkdir newlib
cd newlib
cvs -z 9 -d :pserver:anoncvs at sourceware.org:/cvs/src login
cvs -z 9 -d :pserver:[email protected]:/cvs/src login
# password: anoncvs
cvs -z 9 -d :pserver:anoncvs at sourceware.org:/cvs/src co newlib
mkdir install
cd src/newlib
./configure --prefix=/usr/local/src/newlib/install --disable-shared
CFLAGS="-O2 -mcmodel=kernel"
make
make install

In the rtai menu go to
Base system -> Other features:
Enable "Mathfuns support in kernel"
Nextline should have a "(1)" for NEWLIB
"The installation directory of your chosen libm.a" should be set to
/usr/local/src/newlib/install/lib

Then make RTAI again.

This should work.



On 01/11/2016 01:55 PM, Rathin Dholakia wrote:
> Dear Doug,
>
> I tried doing your method of building Newlib locally but that itself is
> not building. its giving following error
>
> /usr/local/src/newlib/src/newlib/libc/include/_ansi.h:130:19: error:
> missing binary operator before token "("
>
> and
>
> " Makefile:383: recipe for target 'argz_add.lo' failed
> make[3]: *** [argz_add.lo] Error 1" "
>
> and whole bunch of other stuff. in short something big is wrong..
>
> Will have try different things to compile. but as an alternative I tried
> installing default NewLib of ubuntu, which also didnt work.
>
> By the way my installation configuration is as follows:
>
> Ubuntu 14.10 32-bit
> Kernel: 3.16.0
> RTAI: 4.1
>
> Hardware:
> Processor: i3 quad-core
> RAM: 4 GB
> Motherboard: Gigabyte
>
> Just in case if you require..
> Rathin
>
>
> On Mon, Jan 11, 2016 at 11:38 PM, Rathin Dholakia
> <[email protected] <mailto:[email protected]>> wrote:
>
>     Dear Doug,
>
>     Thank you VERY MUCH for your help.. I did came across your name but
>     not the same thread.!
>
>     I tried both 4.1 and 5.0test1 as well as vulcano.. got the same
>     error... but I will try your method and let you know..!
>
>     Thanks a lot for tip..
>
>     Regards,
>     Rathin
>
>     On Mon, Jan 11, 2016 at 11:13 PM, Doug Renton <[email protected]
>     <mailto:[email protected]>> wrote:
>
>         Hi Rathin,
>
>         I had a math issue earlier in the summer and there were some
>         tricks. Have you read through these two threads?
>
>         https://mail.rtai.org/pipermail/rtai/2015-September/026912.html
>
>         https://mail.rtai.org/pipermail/rtai/2014-October/026540.html
>
>         I've yet to try 5.1 though. So I'm not sure things are still
>         100% the same.
>           Doug
>
>
>
>
>
>
>         On 01/11/2016 10:06 AM, Rathin Dholakia wrote:
>
>             Dear All,
>
>             That problem of math module not getting compiled got solved.
>             I spent few
>             hours and finally figured that since Ubuntu 12.04 they have
>             changed the
>             library directory structure. so the "libm.a" location  has
>             been changed
>             to "arch specific directory" and hence the make was not able
>             to find it...!!
>
>             But now I am faced with another challenge that when I try to
>             insert
>             rtai_math.ko it shows "unknown symbol error."
>
>             My dmesg shows:
>
>             [  276.359092] rtai_math: Unknown symbol __get_cpu_features
>             (err 0)
>             [  276.359104] rtai_math: Unknown symbol gammaf_r (err 0)
>             [  276.359112] rtai_math: Unknown symbol errno (err 0)
>             [  276.359120] rtai_math: Unknown symbol __fpclassifyd (err 0)
>             [  276.359137] rtai_math: Unknown symbol strtod (err 0)
>             [  276.359146] rtai_math: Unknown symbol infinity (err 0)
>             [  276.359152] rtai_math: Unknown symbol gamma_r (err 0)
>             [  276.359162] rtai_math: Unknown symbol strtof (err 0)
>             [  276.359170] rtai_math: Unknown symbol infinityf (err 0)
>             [  276.359177] rtai_math: Unknown symbol
>             _GLOBAL_OFFSET_TABLE_ (err 0)
>             [  276.359185] rtai_math: Unknown symbol _dl_hwcap (err 0)
>             [  276.359186] rtai_math: no symbol version for strlen
>             [  276.359187] rtai_math: Unknown symbol strlen (err -22)
>             [  276.359195] rtai_math: Unknown symbol __signbitd (err 0)
>
>
>             Can anyone suggest what might be going wrong?
>
>             I am updating this thread so that any newbie like me if
>             facing the same
>             issue , can find it.
>
>
>             Thank you,
>
>             Sincerely,
>             Rathin
>
>
>             On Mon, Jan 11, 2016 at 12:16 PM, Rathin Dholakia
>             <[email protected] <mailto:[email protected]>
>             <mailto:[email protected]
>             <mailto:[email protected]>>> wrote:
>
>                  Dear Members,
>
>                  First of all I am new to RTAI domain and have to admit
>             I am blown by
>                  the efforts of community. My sincerest gratitude for
>             such an amazing
>                  development..!
>
>                  Now to my query, I am trying to implement a RTAI system
>             with
>                  RTAI-4.1 on Kernel 3.16.0 using x86 patch. Basically I
>             am trying to
>                  port a old RTAI 3.6 to new rtai-4.1.
>
>                  Everything went fine, I ran test and latencies are also
>             good. But I
>                  am not able to build the Math module, as soon as I turn
>             "math
>                  option" ON in "other features" RTAI fails to compile.
>
>                  Can someone guide, How to work around it? I saw the
>             archived post of
>                  "Kernel math error" & missing exportlib.h but I
>             couldn't figure out
>                  what to do.
>
>
>                  Sincerely,
>                  Rathin
>
>
>
>
>             --
>             Rathin A. Dholakia
>             "Dont GO through life, GROW through life"
>
>
>             _______________________________________________
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>             [email protected] <mailto:[email protected]>
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>
>         _______________________________________________
>         Rtai mailing list
>         [email protected] <mailto:[email protected]>
>         https://mail.rtai.org/cgi-bin/mailman/listinfo/rtai
>
>
>
>
>     --
>     Rathin A. Dholakia
>     "Dont GO through life, GROW through life"
>
>
>
>
> --
> Rathin A. Dholakia
> "Dont GO through life, GROW through life"
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