可以编译iostream库吗?
Can Emstripten compile the iostream library?
我在Ubuntu上。
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
我安装了Emscripten。
$ sudo apt-get install emscripten
我写了下面的c++程序:
#include <iostream>
int main(){
printf("hello worldn");
}
按预期编译。
$ emcc -O1 -s ASM_JS=1 main.cpp
$
但是,当我使用iostream工具编写类似的程序时:
#include <iostream>
int main(){
std::cout << "hello world" << std::endl;
}
构建失败。
$ emcc -O1 -s ASM_JS=1 main.cpp
aborting from js compiler due to exception: unknown vector type <4 x i8> | undefined
aborting from js compiler due to exception: unknown vector type <4 x i8> | undefined
aborting from js compiler due to 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 an output - process failed? We only got: ' + output[0][-3000:]
AssertionError: Did not receive forwarded data in an output - process failed? We only 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;
do {
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') and len(open(filename + '.o.js', 'r').read()) > 0, 'Emscripten failed to generate .js: ' + str(compiler_output)
AssertionError: Emscripten failed to generate .js:
我的印象是Emscripten
已经走了很长一段路,并且能够为浏览器编译整个c++游戏!是否有某种类型的标志或配置,我错过了为了成功地编译部分c++标准库?我知道clang/gcc编译器默认会链接到c++标准共享库。你认为这个问题与此有关吗?
我还尝试使用命令em++
代替emcc
,并收到相同的错误信息。
如果相关,下面是第一次运行emscripten时构建的默认配置:
$ cat ~/.emscripten
# Note: If you put paths relative to the home directory, do not forget os.path.expanduser
import os
# this helps projects using emscripten find it
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 for notes on which JS engine(s) you 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 this to not use the bundled version
########################################################################################################
# Pick the JS engine to use for running the compiler. This engine must exist, or
# nothing can be compiled.
#
# Recommendation: If you already have node installed, use that. Otherwise, build v8 or
# spidermonkey from source. Any of these three is fine, as long as it's
# a recent version (especially for v8 and spidermonkey).
COMPILER_ENGINE = NODE_JS
#COMPILER_ENGINE = V8_ENGINE
#COMPILER_ENGINE = SPIDERMONKEY_ENGINE
# All JS engines to use when running the automatic tests. Not all the engines in this list
# must exist (if they don't, they will be skipped in the test runner).
#
# Recommendation: If you already have node installed, use that. If you can, also build
# spidermonkey from source as well to get more test coverage (node can't
# run all the tests due to node issue 1669). v8 is currently not recommended
# here because of v8 issue 1822.
JS_ENGINES = [NODE_JS] # add this if you have spidermonkey installed too, SPIDERMONKEY_ENGINE]
我似乎找不到一种方法使上面的基本c++程序成功编译。
首先,您的程序用emcc可以很好地编译。您的原始程序(使用printf)会使emcc假定它正在编译C代码,因此它会像C一样自动包含stdio.h。你的第二个程序有更多的麻烦,可能是由于安装错误(对我来说,我有一个这样的问题,因为我的LLVM版本不符合Emscripten需要的确切版本。)
不幸的是,我的理解是这是emscripten和自动安装程序(如apt-get)的常见问题——我在Mac上使用port和brew时都遇到了这个问题。
解决方案是通过SDK获得Emscripten,它将所有敏感部分捆绑在一起:https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html
仔细按照上面的说明去做。我遇到的两个问题是,它期望Python 2在您的系统上被称为python2
,并且脚本将调整默认路径,假设您使用bash(如果您使用bash,它应该可以正常工作)
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