Re: Unknown symbol in rtai_math.ko in rtai-5.0

Ok. Thank you suggestion.
I'll try your configuration: Debian 5.0 with kenel 4.1.18 with rtai-5.0

Thank you very much.


On Wed, Feb 7, 2018 at 8:52 PM, Paolo Mantegazza <[email protected]
> wrote:

> I retested the math kernel test with the only (old) 32 bits system I've
> and it worked for me.
> The installation I used is a bit outdated: Debian 5.0, gcc  4.3.2, libxxx
> 2.7, with libm.a found in /usr/lib/libm.a.
> In any case I used Linux 4.1.18.
> At the moment I can only suggest to try with newlib or musl. Alternatively
> try a more recent RTAI-version.
> Paolo
>
>
>
> On 02/07/2018 01:24 PM, Guo Yunfei wrote:
>
> I set  the Mathfuns support in Kernel to enable
> using item 3, it is GLIBC.
> then I give the libm.a path to /usr/lib/i386-linux-gnu.
> for I find the libm.a in that path exactly.
>
> Many thanks to Paolo.
>
> On Wed, Feb 7, 2018 at 7:04 PM, Paolo Mantegazza <
> [email protected]> wrote:
>
>> How did you configure the RTAI math lib to use?
>> Paolo
>>
>>
>> On 02/07/2018 11:54 AM, Guo Yunfei wrote:
>>
>>
>> Hi. Everybody.
>>
>> I get trouble with rtai_math.ko for a long time.
>> I'm using 32bit Debian 8.9.0 with kernel-4.1.18 with rtai-5.0.
>> I setup the math funtion in kernel item enable.
>> The libm.a path was setting to /usr/lib/i386-linux-gnu. set as 3, using
>> glibc-libm.a
>>
>>
>>
>> When I make the rtai-5.0, some warning message always pop out like below:
>>
>> //---------------------------------------------------------
>> Making all in math
>> make[3]: Entering directory '/media/guoissac/13GDATA/rtai-5.0/base/math'
>> make[4]: Entering directory '/media/guoissac/13GDATA/linux-4.1.18'
>>   CC [M]  /media/guoissac/13GDATA/rtai-5.0/base/math/libm.o
>>   LD [M]  /media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.o
>>   Building modules, stage 2.
>>   MODPOST 1 modules
>> WARNING: "remquo" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "erfcf" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "ynf" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "erfc" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "frexp" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "logbf" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "y1" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "expm1f" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "__signbitd" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "trunc" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>>
>> ....
>> ....
>> ....
>>
>>
>> WARNING: "exp2f" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "lroundf" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "asinh" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "cosh" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "sqrt" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "log" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "fabs" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "fmodf" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>> WARNING: "expm1" [/media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko]
>> undefined!
>>   CC      /media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.mod.o
>>   LD [M]  /media/guoissac/13GDATA/rtai-5.0/base/math/rtai_math.ko
>> make[4]: Leaving directory '/media/guoissac/13GDATA/linux-4.1.18'
>> mv rtai_math.ko rtai_math.ko.tmp
>> ld -r -static -o rtai_math.ko rtai_math.ko.tmp
>> /usr/lib/i386-linux-gnu/libm.a
>> rm -f rtai_math.ko.tmp
>> //-------------------------------------------------------------
>>
>> If I not care of above warning message. go on insmod rtai_math.ko.
>> the error message pop out like below:
>> //--------------------------------
>>
>> insmod: ERROR: could not insert module rtai_math.ko: Unknown symbol in
>> module
>>
>>
>> //----------------------------
>>
>> Then I dmesg, it showing like below:
>>
>> //-------------------------------------------
>> [  101.763572] rtai_math: Unknown symbol gammaf_r (err 0)
>> [  101.763584] rtai_math: Unknown symbol errno (err 0)
>> [  101.763598] rtai_math: Unknown symbol __fpclassifyd (err 0)
>> [  101.763612] rtai_math: Unknown symbol rt_smp_current (err 0)
>> [  101.763621] rtai_math: Unknown symbol rtai_cpu_lock (err 0)
>> [  101.763632] rtai_math: Unknown symbol strtod (err 0)
>> [  101.763643] rtai_math: Unknown symbol infinity (err 0)
>> [  101.763653] rtai_math: Unknown symbol gamma_r (err 0)
>> [  101.763665] rtai_math: Unknown symbol strtof (err 0)
>> [  101.763675] rtai_math: Unknown symbol infinityf (err 0)
>> [  101.763686] rtai_math: Unknown symbol _GLOBAL_OFFSET_TABLE_ (err 0)
>> [  101.763696] rtai_math: Unknown symbol _dl_hwcap (err 0)
>> [  101.763707] rtai_math: Unknown symbol __signbitd (err 0)
>>
>> //---------------------------
>>
>> I tried many other configuration like:
>> ubuntu 14.04 with kernel-4.1.18 with rtai-5.0
>> ubuntu 14.04 with kernel-3.10.32 with rtai-4.1
>> Debian 8.9 with kernel-3.10.32 with rtai-4.1
>> Debian 7.0.0 with kernel-3.10.32 with rtai-4.1
>>
>> But all of it show the same error message.
>>
>> Could anyone give me some guid on solve those problem?
>> Or, could you share your successful experience with rtai_math.ko to me?
>>
>>
>> Best Regards
>> Guo Issac
>> From ShangHang. China.
>>
>>
>>
>> _______________________________________________
>> Rtai mailing [email protected]://mail.rtai.org/cgi-bin/mailman/listinfo/rtai
>>
>>
>>
>
>

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