Re: Problem when linking rtai_math.ko

Hi.

FYI, I finally found the solution of the missing symbols on this page : http://mail.rtai.org/pipermail/rtai/2012-December/025250.html

The problem was : when linking rtai_math.ko, there was a lot of warnings :
WARNING: "acos" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "asin" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "exp" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "log10" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "sinh" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "pow" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "atan2" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "fmod" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "cosh" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "sqrt" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "log" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!

And when I try to insmod rtai_math.ko, I get the following error :
"rtai_math : unknown symbol log (err 0)
rtai_math : unknown symbol sqrt (err 0)
rtai_math : unknown symbol cosh (err 0)
rtai_math : unknown symbol fmod (err 0)
rtai_math : unknown symbol atan2 (err 0)
rtai_math : unknown symbol pow (err 0)
rtai_math : unknown symbol sinh (err 0)
rtai_math : unknown symbol log10 (err 0)
rtai_math : unknown symbol exp (err 0)
rtai_math : unknown symbol asin (err 0)
rtai_math : unknown symbol acos (err 0)"


The solution was : replacing the option -ffast-math by -fno-math-errno -funsafe-math-optimizations -fno-rounding-math
-fno-signaling-nans -fcx-limited-range in rtai-4.0.1/configure.in and in rtai-4.0.1/base/math/GNUMakefile.

Now it compiles and insmod withoud any problem.

Laurence TROUVÉ.

De : Laurence TROUVE
Envoyé : vendredi 1 juillet 2016 15:06
À : '[email protected]'
Objet : Problem when linking rtai_math.ko

Hi.

I need help in making and loading rtai_math.ko.

I am building an embedded system with buildroot (2016.02) for a X86 Vortex (i586) with :
glibc v2.21
binutils 2.24
gcc 4.9.x
kernel version : 3.8.13
rtai : 4.0.1

I have a problem trying to make rtai when I select "Mathfuns support in kernel" : there is a lot of warnings when linking rtai_math !

Extract of compilation when I do "make" in '/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/:

Making all in math
make[3]: Entering directory '/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math'
make[4]: Entering directory '/home/bee/Tests_buildroot/buildroot-2016.02/output/build/linux-3.8.13'
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_acos.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_asin.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_atan2.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_cosh.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_exp.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_fmod.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_log.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_log10.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_pow.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_rem_pio2.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_sinh.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/e_sqrt.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/k_cos.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/k_rem_pio2.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/k_sin.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/k_tan.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_atan.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_ceil.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_copysign.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_cos.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_expm1.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_fabs.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_floor.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_frexp.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_modf.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_scalbn.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_sin.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_tan.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/s_tanh.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/sign.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_acos.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_asin.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_atan2.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_cosh.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_exp.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_fmod.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_log.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_log10.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_pow.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_sinh.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/w_sqrt.o
  CC [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/libm.o
  LD [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "acos" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "asin" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "exp" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "log10" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "sinh" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "pow" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "atan2" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "fmod" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "cosh" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "sqrt" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
WARNING: "log" [/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko] undefined!
  CC      /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.mod.o
  LD [M]  /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math/rtai_math.ko
make[4]: Leaving directory '/home/bee/Tests_buildroot/buildroot-2016.02/output/build/linux-3.8.13'
make[3]: Leaving directory '/home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math'

The Module.symvers file in /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/ seem ok :
"acos     /home/bee/Tests_buildroot/buildroot-2016.02/output/build/rtai-4.0.1/base/math         EXPORT_SYMBOL"

And when I try to insmod rtai_math.ko, I get the following error :
"rtai_math : unknown symbol log (err 0)
rtai_math : unknown symbol sqrt (err 0)
rtai_math : unknown symbol cosh (err 0)
rtai_math : unknown symbol fmod (err 0)
rtai_math : unknown symbol atan2 (err 0)
rtai_math : unknown symbol pow (err 0)
rtai_math : unknown symbol sinh (err 0)
rtai_math : unknown symbol log10 (err 0)
rtai_math : unknown symbol exp (err 0)
rtai_math : unknown symbol asin (err 0)
rtai_math : unknown symbol acos (err 0)"

All the other rtai modules load without problem.
Please tell me what I am doing wrong ? How can I successfully make and load rtai_math.ko ?..
Thank you.

Laurence TROUVÉ.

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