javascript - Can Emstripten compile the iostream library? -
i'm on ubuntu.
$ lsb_release -a no lsb modules available. distributor id: ubuntu description: ubuntu 14.04.2 lts release: 14.04 codename: trusty i installed emscripten.
$ sudo apt-get install emscripten i wrote following c++ program:
#include <iostream> int main(){ printf("hello world\n"); } it compiles expected.
$ emcc -o1 -s asm_js=1 main.cpp $ however, when write similar program using iostream facilities:
#include <iostream> int main(){ std::cout << "hello world" << std::endl; } it fails build.
$ emcc -o1 -s asm_js=1 main.cpp aborting js compiler due exception: unknown vector type <4 x i8> | undefined aborting js compiler due exception: unknown vector type <4 x i8> | undefined aborting js compiler due exception: unknown vector type <4 x i8> | undefined traceback (most recent call last): file "/usr/share/emscripten/emscripten.py", line 1352, in <module> _main(environ=os.environ) file "/usr/share/emscripten/emscripten.py", line 1340, in _main temp_files.run_and_clean(lambda: main( file "/usr/share/emscripten/tools/tempfiles.py", line 39, in run_and_clean return func() file "/usr/share/emscripten/emscripten.py", line 1348, in <lambda> debug_cache=debug_cache, file "/usr/share/emscripten/emscripten.py", line 1235, in main jcache=jcache, temp_files=temp_files, debug=debug, debug_cache=debug_cache) file "/usr/share/emscripten/emscripten.py", line 292, in emscript assert len(output) == 2, 'did not receive forwarded data in output - process failed? got: ' + output[0][-3000:] assertionerror: did not receive forwarded data in output - process failed? got: ((heap32[(($1)>>2)])|0); $3=((($2)-(12))|0); $4=$3; $5=((heap32[(($4)>>2)])|0); $6=$this; $_sum=((($5)+(24))|0); $7=(($6+$_sum)|0); $8=$7; $9=((heap32[(($8)>>2)])|0); $10=($9|0)==0; if ($10) { stacktop=sp;return (($this)|0); } $12=(($__s)|0); heap8[($12)]=0; $13=(($__s+4)|0); heap32[(($13)>>2)]=$this; $_sum_i=((($5)+(16))|0); $14=(($6+$_sum_i)|0); $15=$14; $16=((heap32[(($15)>>2)])|0); $17=($16|0)==0; { if ($17) { $_sum1_i=((($5)+(72))|0); $19=(($6+$_sum1_i)|0); $20=$19; $21=((heap32[(($20)>>2)])|0); $22=($21|0)==0; if (!($22)) { $24=((__znst3__113basic_ostreamicns_11char_traitsiceee5flushev($21))|0); } heap8[($12)]=1; $26=((heap32[(($1)>>2)])|0); $27=((($26)-(12))|0); $28=$27; $29=((heap32[(($28)>>2)])|0); $_sum1=((($29)+(24))|0); $30=(($6+$_sum1)|0); $31=$30; $32=((heap32[(($31)>>2)])|0); $33=$32; $34=$32; $35=((heap32[(($34)>>2)])|0); $36=(($35+24)|0); $37=((heap32[(($36)>>2)])|0); $38=((function_table_ii[($37)&{{{ ftm_ii }}}]($33))|0); $39=($38|0)==-1; if (!($39)) { break; } $41=((heap32[(($1)>>2)])|0); $42=((($41)-(12))|0); $43=$42; $44=((heap32[(($43)>>2)])|0); $45=(($6+$44)|0); $46=$45; $_sum2=((($44)+(16))|0); $47=(($6+$_sum2)|0); $48=$47; $49=((heap32[(($48)>>2)])|0); $50=$49|1; __znst3__18ios_base5clearej($46,$50); } } while(0); __znst3__113basic_ostreamicns_11char_traitsiceee6sentryd2ev($__s); stacktop=sp;return (($this)|0); } function __znst3__18ios_base33__set_badbit_and_consider_rethrowev($this){ $this=($this)|0; var $1=0,$2=0,$3=0,$4=0,$5=0,$6=0,$7=0,label=0; $1=(($this+16)|0); $2=((heap32[(($1)>>2)])|0); $3=$2|1; heap32[(($1)>>2)]=$3; $4=(($this+20)|0); $5=((heap32[(($4)>>2)])|0); $6=$5&1; $7=($6|0)==0; if ($7) { return; } else { ___cxa_rethrow(); } } function __znst3__113basic_istreamiwns_11char_traitsiweeed0ev($this){ $this=($this)|0; var $1=0,$2=0,label=0; $1=(($this+8)|0); __znst3__18ios_based2ev($1); $2=$this; __zdlpv($2); return; } function __znst3__113basic_istreamiwns_11char_traitsiweeed1ev($this){ $this=($this)|0; var $1=0,label=0; $1=(($this+8)|0); __znst3__18ios_based2ev($1); return; } function __ztv0_n12_nst3__113basic_istreamiwns_11char_traitsiweeed0ev($this){ $this=($this)|0; var $1=0,$2=0,$3=0,$4=0,$5=0,$6=0,$7=0,$_sum=0,$8=0,$9=0,label=0; $1=$this; $2=$this; $3=((heap32[(($2)>>2)])|0); $4=((($3)-(12))|0); $5=$4; $6=((heap32[(($5)>>2)])|0); $7=(($1+$6)|0); $_sum=((($6)+(8))|0); $8=(($1+$_sum)|0); $9=$8; __znst3__18ios_based2ev($9); __zdlpv($7); return; } function __ztv0_n12_nst3__113basic_istreamiwns_11char_traitsiweeed1ev($this){ $this=($this)|0; var $1=0,$2=0,$3=0,$4=0,$5=0,$6=0,$_sum=0,$7=0,$8=0,label=0; $1=$this; $2=$this; $3=((heap32[(($2)>>2)])|0); $4=((($3)-(12))|0); $5=$4; $6=((heap32[(($5)>>2)])|0); $_sum=((($6)+(8))|0); $7=(($1+$_sum)|0); $8=$7; __znst3__18ios_based2ev($8); return; } traceback (most recent call last): file "/usr/bin/emcc", line 1864, in <module> final = shared.building.emscripten(final, append_ext=false, extra_args=extra_args) file "/usr/share/emscripten/tools/shared.py", line 1276, in emscripten assert os.path.exists(filename + '.o.js') , len(open(filename + '.o.js', 'r').read()) > 0, 'emscripten failed generate .js: ' + str(compiler_output) assertionerror: emscripten failed generate .js: i under impression emscripten has come long way, , capable of compiling entire c++ games browser! there kind of flag or configuration missed in order sucessfully compile portions of c++ standard library? know clang/gcc compilers link against c++ standard shared library default. issue have think?
i have tried using command em++ in place of emcc , recieved same error message.
if relevant, here default configuration built when running emscripten first time:
$ cat ~/.emscripten # note: if put paths relative home directory, not forget os.path.expanduser import os # helps projects using emscripten find emscripten_root = os.path.expanduser(os.getenv('emscripten') or '/usr/share/emscripten') # directory llvm_root = os.path.expanduser(os.getenv('llvm') or '/usr/bin') # directory python = os.path.expanduser(os.getenv('python') or '/usr/bin/python2') # executable # see below notes on js engine(s) need node_js = os.path.expanduser(os.getenv('node') or '/usr/bin/node') # executable spidermonkey_engine = [os.path.expanduser(os.getenv('spidermonkey') or 'js')] # executable v8_engine = os.path.expanduser(os.getenv('v8') or 'd8') # executable java = 'java' # executable temp_dir = '/tmp' crunch = os.path.expanduser(os.getenv('crunch') or 'crunch') # executable #closure_compiler = '..' # define not use bundled version ######################################################################################################## # pick js engine use running compiler. engine must exist, or # nothing can compiled. # # recommendation: if have node installed, use that. otherwise, build v8 or # spidermonkey source. of these 3 fine, long it's # recent version (especially v8 , spidermonkey). compiler_engine = node_js #compiler_engine = v8_engine #compiler_engine = spidermonkey_engine # js engines use when running automatic tests. not engines in list # must exist (if don't, skipped in test runner). # # recommendation: if have node installed, use that. if can, build # spidermonkey source more test coverage (node can't # run tests due node issue 1669). v8 not recommended # here because of v8 issue 1822. js_engines = [node_js] # add if have spidermonkey installed too, spidermonkey_engine] i can't seem find way basic c++ program above compile.
first, program compiles fine me emcc. original program (with printf) causes emcc assume compiling c code , such auto-include stdio.h c does. second program having more trouble, due install error (for me had issue because version of llvm doesn't line exact version emscripten needed.)
unfortunately, understanding common problem emscripten , auto installers apt-get -- had problem both port , brew on mac.
the solution emscripten through sdk, bundles of sensitive pieces together: https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html
follow instructions there carefully. 2 problems ran expects python 2 called python2 on system , script adjust default path assumes you're using bash (if are, should work fine.)
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