build on all 4 supported Travis architectures

[mr-c]

No description provided.

[taoliu]

Thanks! I did this before to add arm64 e792658 but Travis can't build Numpy and Cython.

[mr-c]

You are welcome @taoliu !
Lets see if sudo fixes the problems..

[taoliu]

I am trying arm64 and see this error while compiling numpy:

https://travis-ci.com/taoliu/MACS/jobs/288971199

  gcc: numpy/core/src/multiarray/methods.c
  In file included from numpy/core/src/umath/loops.c.src:50:0:
  numpy/core/src/umath/loops.c.src: In function ‘LONG_right_shift’:
  numpy/core/src/umath/loops.c.src:694:47: internal compiler error: in expand_shift_1, at expmed.c:2349
       BINARY_LOOP_FAST(@type@, @type@, *out = npy_rshift@c@(in1, in2));
                                                 ^
  numpy/core/src/umath/fast_loop_macros.h:180:9: note: in definition of macro ‘BASE_BINARY_LOOP_S_INP’
           op; \
           ^
  numpy/core/src/umath/loops.c.src:694:5: note: in expansion of macro ‘BINARY_LOOP_FAST’
       BINARY_LOOP_FAST(@type@, @type@, *out = npy_rshift@c@(in1, in2));
       ^
  Please submit a full bug report,
  with preprocessed source if appropriate.
  See <file:///usr/share/doc/gcc-5/README.Bugs> for instructions.

Since I saw Numpy can pass Debian autobuilder https://buildd.debian.org/status/package.php?p=numpy&suite=sid, maybe there is some specific FLAG for gcc?

[taoliu]

Now, I can test arm64 and reproduce the error

https://travis-ci.com/taoliu/MACS/builds/149693293

Add --no-cache-dir to pip: https://github.com/taoliu/MACS/blob/fix_test_multi_arch/.travis.yml

[mr-c]

Thanks @taoliu ! I got hit by a GItHub bug yesterday (my commit wasn't showing up in this PR while it was clearly visible on my branch) so I had given up for a bit.

I'll keep poking on a Python 32-bit x86 Travis CI solution.

[taoliu]

@mr-c Thanks for the update! I have tried to set 'dist: bionic' in my branch:

https://github.com/taoliu/MACS/blob/8372b149f3e41bae19f97dff7943a9fa0dc21648/.travis.yml#L1-L37

And now MACS2 can be built under the four architectures and I can see the errors from the cmdlinetest.