Hi Alon,
after I upped my emscripten installation to use the "fastcomp" option by
default and setting up the LLVM backend as described in the Wiki (
https://github.com/kripken/emscripten/wiki/LLVM-Backend), the final
JavaScript generation phase crashes (see here:
https://github.com/kripken/emscripten/issues/2244)
DEBUG root: emscript: llvm backend:
/home/balko/dev/libav.js/emscripten-fastcomp/build/Release/bin/llc
/tmp/tmprwoJAW/ffmpeg.bc -march=js -filetype=asm -o
/tmp/emscripten_temp/tmpsziB5y.4.js -O2
0 llc 0x0896f75f llvm::sys::PrintStackTrace(_IO_FILE*) + 47
1 llc 0x0896f9bf
2 llc 0x0896f3c4
3 0x40022400 __kernel_sigreturn + 0
4 llc 0x088ab1a7 llvm::Value::stripPointerCasts() + 23
5 llc 0x087983ab
6 llc 0x08799c26
7 llc 0x0879b703
8 llc 0x08897464 llvm::MPPassManager::runOnModule(llvm::Module&) + 596
9 llc 0x088975f3 llvm::PassManagerImpl::run(llvm::Module&) + 227
10 llc 0x08897686 llvm::PassManager::run(llvm::Module&) + 38
11 llc 0x0812ed3c
12 llc 0x08120df7 main + 247
13 libc.so.6 0x401be935 __libc_start_main + 245
14 llc 0x0812b599
Stack dump:
0. Program arguments:
/home/balko/dev/libav.js/emscripten-fastcomp/build/Release/bin/llc
/tmp/tmprwoJAW/ffmpeg.bc -march=js -filetype=asm -o
/tmp/emscripten_temp/tmpsziB5y.4.js -O2
1. Running pass 'JavaScript backend' on module '/tmp/tmprwoJAW/ffmpeg.bc'.
DEBUG root: emscript: llvm backend took 5.70895290375 seconds
Traceback (most recent call last):
File "/home/balko/dev/libav.js/emscripten/emscripten.py", line 1433, in
<module>
_main(environ=os.environ)
File "/home/balko/dev/libav.js/emscripten/emscripten.py", line 1421, in _main
temp_files.run_and_clean(lambda: main(
File "/home/balko/dev/libav.js/emscripten/tools/tempfiles.py", line 39, in
run_and_clean
return func()
File "/home/balko/dev/libav.js/emscripten/emscripten.py", line 1429, in
<lambda>
DEBUG_CACHE=DEBUG_CACHE,
File "/home/balko/dev/libav.js/emscripten/emscripten.py", line 1316, in main
jcache=jcache, temp_files=temp_files, DEBUG=DEBUG, DEBUG_CACHE=DEBUG_CACHE)
File "/home/balko/dev/libav.js/emscripten/emscripten.py", line 761, in
emscript_fast
backend_output = open(temp_js).read()
IOError: [Errno 2] No such file or directory:
'/tmp/emscripten_temp/tmpsziB5y.4.js'
Traceback (most recent call last):
File "/home/balko/dev/libav.js/emscripten/emcc", line 1537, in <module>
final = shared.Building.emscripten(final, append_ext=False,
extra_args=extra_args)
File "/home/balko/dev/libav.js/emscripten/tools/shared.py", line 1333, in
emscripten
assert os.path.exists(filename + '.o.js') and len(open(filename + '.o.js',
'r').read()) > 0, 'Emscripten failed to generate .js: ' + str(compiler_output)
AssertionError: Emscripten failed to generate .js:
make: *** [/home/balko/dev/libav.js/bin/ffmpeg.js] Error 1
As I could successfully compile that code before, this is presumably a bug
in the new fastcomp option (i.e., the LLVM backend). I have made the LLVM
bitcode files available on DropBox:
https://dl.dropboxusercontent.com/u/97987244/bugs/emcc-0-basebc.bc and
https://dl.dropboxusercontent.com/u/97987244/bugs/emcc-1-linktime.bc*. *Any
clues?
Thanks,
Soeren
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