Re: Math module not compiling

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]>> 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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