Can't install Kivy: Cython/GCC error

Question

so I tried to install Kivy following the instructions from the official site:

$ sudo apt-get install python-setuptools python-pygame python-opengl \
  python-gst0.10 python-enchant gstreamer0.10-plugins-good python-dev \
  build-essential libgl1-mesa-dev libgles2-mesa-dev python-pip

$ sudo pip install --upgrade cython

$ sudo easy_install kivy

This is what I get:

Searching for kivy
Reading http://pypi.python.org/simple/kivy/
Best match: Kivy 1.4.1
Downloading http://pypi.python.org/packages/source/K/Kivy/Kivy-1.4.1.tar.gz#md5=94bba894269e4bdecc7881f256367e01
Processing Kivy-1.4.1.tar.gz
Running Kivy-1.4.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-MMi2Fv/Kivy-1.4.1/egg-dist-tmp-EcKbfC
[INFO   ] Kivy v1.4.1
Found GLES 2.0 headers at /usr/include/GLES2/gl2.h
Build configuration is:
 * use_opengl_es2  =  True
 * use_glew  =  False
 * use_opengl_debug  =  False
 * use_mesagl  =  False
Generate config.h
Generate config.pxi
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c: In function ‘__pyx_f_4kivy_8graphics_14transformation_6Matrix_identity’:
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:2774:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c: In function ‘__pyx_f_4kivy_8graphics_14transformation_6Matrix_inverse’:
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:2978:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:2980:13: error: incompatible types when assigning to type    ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c: In function ‘__pyx_f_4kivy_8graphics_14transformation_6Matrix_multiply’:
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:3364:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:3366:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:3368:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c: In function ‘__pyx_pf_4kivy_8graphics_14transformation_6Matrix_20__str__’:
/tmp/easy_install-MMi2Fv/Kivy-1.4.1/kivy/graphics/transformation.c:3674:13: error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’
 error: Setup script exited with error: command 'gcc' failed with exit status 1

After failing to find an answer in the web I began to investigate the files which generated the error: transformation.c, transformation.pyx and transformation.pyd. I also read a little about Cython.

Firstly, all errors are of the same kind:

error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’

The first error is raised here:

__pyx_t_3 = __pyx_v_self->mat;

The type of __pyx_t_3 is:

__pyx_t_4kivy_8graphics_14transformation_matrix_t

It has this weird name because it was generated automatically from the transformation.pxd file:

ctypedef double matrix_t[16]

So, type(__pyx_t_3) == type(matrix_t) == double *.

The type of __pyx_v_self is:

struct __pyx_obj_4kivy_8graphics_14transformation_Matrix *

Again, it was generated from transformation.pxd:

ctypedef double matrix_t[16]

cdef class Matrix:
    cdef matrix_t mat
    ...

Therefore, type(__pyx_v_self->mat) == type(Matrix.mat) == type(matrix_t) == double *

As we can see, both sides of the assignment:

__pyx_t_3 = __pyx_v_self->mat;

are of (double *) type.

Why is this error:

error: incompatible types when assigning to type ‘__pyx_t_4kivy_8graphics_14transformation_matrix_t’ from type ‘double *’

being raised then?

It looks like the compiler is not recognizing the type of matrix_t as a double *.

simplylizz · Accepted Answer · 2012-11-21T07:17:05.823

16

Just met the same error. Using of Cython 0.17.1 helps me:

sudo pip install Cython==0.17.1

If you want not just fix problem you can go in depth and check what was changed between this two versions. https://github.com/cython/cython/blob/master/CHANGES.rst#0172-2012-11-20 - here you can find related issues, but unfortunately I'm not a guru of C/Cython and quick glance to diff between master and 0.17.1 doesn't says me where is the problem, but if you wish you can investigate the problem by yourself.

edited Nov 21 '12 at 07:17

answered Nov 21 '12 at 06:35

simplylizz

1,686
14
28

Oh my God, I can't believe it worked! I was initially using an older version of Cython, then I upgrated it to the newest version: 0.17.2, I would never had imagined that I should have got an older version to make it work. Thank you very much! – orangesky Nov 21 '12 at 16:27
I was getting this error: `#error Do not use this file, it is the result of a failed Cython compilation` `error: command 'x86_64-linux-gnu-gcc' failed with exit status 1` and this fixed it. Thanks! +1 – Charles Clayton Dec 17 '14 at 06:06

score 0 · Answer 2 · answered Apr 27 '13 at 02:07

0

I just had the same error as well. I traced it down to a small example and sent an email to the Cython mailing list: https://groups.google.com/forum/?fromgroups=#!topic/cython-users/fSZgHqrlCOc

answered Apr 27 '13 at 02:07

Jason Grout

631
6
10

Can't install Kivy: Cython/GCC error

2 Answers2