Fix emscripten build

[liulongbiao]

Fixed some issue when I use docker to build aubio with emscripten.

Now we can use Docker to build WebAssembly module with :

docker run --rm -v $(pwd):/src trzeci/emscripten /bin/bash -c "./scripts/get_waf.sh && ./scripts/build_emscripten"

[piem]

hi @liulongbiao,

thanks! looks good to me, except the first commit. will comment in details.

cheers, piem

[piem]

1. why would you need to create the __init__.py files? these directories are not python modules
2. what's missing with the current test?

>>> 'emcc' in '/path/to/emcc -E'
True

[piem]

tests and examples were correctly build last time i checked, and could be run with node. why disable them? see wscript#L528

[piem]

could you describe a configuration where the list c_mangled_names is not generated correctly?

[liulongbiao]

1. why would you need to create the __init__.py files? these directories are not python modules
2. what's missing with the current test?

>>> 'emcc' in '/path/to/emcc -E'
True

without the __init__.py files, when configure with --with-target-platform emscripten, will got:

  File "/src/wscript", line 275, in configure
    from python.lib.gen_external import get_c_declarations, \
ImportError: No module named python.lib.gen_external

[liulongbiao]

tests and examples were correctly build last time i checked, and could be run with node. why disable them? see wscript#L528

When I execute the script scripts/build_emscripten with tests, I got :

[ 85/223] Compiling tests/src/spectral/test-fft.c
[ 86/223] Compiling tests/src/spectral/test-filterbank.c
emcc:WARNING: ignoring unsupported linker flag: `--enable-auto-import`
emcc:WARNING: ignoring unsupported linker flag: `-h`
emcc:WARNING: ignoring unsupported linker flag: `aubio.min.js.5`
emcc:WARNING: ignoring unsupported linker flag: `-Bstatic`
emcc:WARNING: ignoring unsupported linker flag: `-Bdynamic`

[ 87/223] Compiling tests/src/spectral/test-filterbank_mel.c
[ 88/223] Compiling tests/src/spectral/test-mfcc.c
[ 89/223] Linking build/tests/test-sink.js
shared:ERROR: emcc: cannot find library "aubio" (`-s ERROR_ON_MISSING_LIBRARIES=0` to disable this error)

Waf: Leaving directory `/src/build'
Build failed
 -> task in 'test-sink' failed with exit status 1 (run with -v to display more information)

[piem]

hi @liulongbiao

please don't close this issue until it is resolved. i will have a deeper look. thanks for your patience,

Paul

[codecov]

Codecov Report

Merging #258 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #258   +/-   ##
=======================================
  Coverage   88.09%   88.09%           
=======================================
  Files         124      124           
  Lines        9716     9716           
  Branches     1729     1729           
=======================================
  Hits         8559     8559           
  Misses       1110     1110           
  Partials       47       47

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