Problem running em++ with simple GLFW C++ code

[Shyamal Chandra]

Hi,

I am getting the following when I run em++ main.cpp with my Emscripten code:

iMe2 (master *) emscripten $ em++ main.cpp

WARNING:root:Could not verify LLVM version: [Errno 2] No such file or directory

CRITICAL:root:fastcomp in use, but LLVM has not been built with the JavaScript backend as a target, llc reports:

===========================================================================

LLVM (http://llvm.org/):

  LLVM version 3.7.0svn

  DEBUG build with assertions.

  Built Mar  9 2015 (16:06:44).

  Default target: x86_64-apple-darwin15.5.0

  Host CPU: core-avx2

  Registered Targets:

    aarch64    - AArch64 (little endian)

    aarch64_be - AArch64 (big endian)

    amdgcn     - AMD GCN GPUs

    arm        - ARM

    arm64      - ARM64 (little endian)

    armeb      - ARM (big endian)

    cpp        - C++ backend

    hexagon    - Hexagon

    mips       - Mips

    mips64     - Mips64 [experimental]

    mips64el   - Mips64el [experimental]

    mipsel     - Mipsel

    msp430     - MSP430 [experimental]

    nvptx      - NVIDIA PTX 32-bit

    nvptx64    - NVIDIA PTX 64-bit

    ppc32      - PowerPC 32

    ppc64      - PowerPC 64

    ppc64le    - PowerPC 64 LE

    r600       - AMD GPUs HD2XXX-HD6XXX

    sparc      - Sparc

    sparcv9    - Sparc V9

    systemz    - SystemZ

    thumb      - Thumb

    thumbeb    - Thumb (big endian)

    x86        - 32-bit X86: Pentium-Pro and above

    x86-64     - 64-bit X86: EM64T and AMD64

    xcore      - XCore

===========================================================================

CRITICAL:root:you can fall back to the older (pre-fastcomp) compiler core, although that is not recommended, see http://kripken.github.io/emscripten-site/docs/building_from_source/LLVM-Backend.html

INFO:root:(Emscripten: Running sanity checks)

CRITICAL:root:Cannot find /usr/local/bin/clang++, check the paths in ~/.emscripten

How can I solve the problem?  I install Emscripten through homebrew for OSX 10.11 but somehow, em++ is having issues.  What to do?

Thanks in advance!

Sincerely,

Shyamal Chandra

shya...@gmail.com

[Floh]

Looks like emscripten is picking up the wrong C/C++ compiler instead of emscripten's own version.

The error message gives a hint what to do ('check the paths in |/.emscripten'):

CRITICAL:root:Cannot find /usr/local/bin/clang++, check the paths in ~/.emscripten

But it's probably better to restart from scratch, remove all traces of your current emscripten install and go with a proper SDK installation as described here:

https://kripken.github.io/emscripten-site/docs/getting_started/downloads.html

I'm not sure how up-to-date and maintained the brew emscripten SDK is.

Cheers,
-Floh.

[Shyamal Chandra]

Hi Floh and others,

First of all, thanks for the solution to the previous problem.

I fixed that previous problem by downloading the Emscripten SDK and installing and activating it.  However, now I have another problem.  When I run with the -o flag (output below) and have an html file as its argument, it has a problem.  What should I do?  

From the help file, it says the following:

"-o <target>"

   The "target" file name extension defines the output type to be

   generated:

      * <name> **.js** : JavaScript.

      * <name> **.html** : HTML + separate JavaScript file

        (**<name>.js**). Having the separate JavaScript file improves

        page load time.

      * <name> **.bc** : LLVM bitcode (default).

      * <name> **.o** : LLVM bitcode (same as .bc).

   Note: If "--memory-init-file" is used, a **.mem** file will be

     created in addition to the generated **.js** and/or **.html**

     file.

Please let me know your diagnosis and solution to this problem.

Thanks in advance!

Shyamal Chandra

shya...@gmail.com

Output below:

iMe2 (master *) emscripten $ em++ main.cpp -o main.html

Traceback (most recent call last):

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emcc", line 13, in <module>

    emcc.run()

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emcc.py", line 1379, in run

    final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args)

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/tools/shared.py", line 1588, in emscripten

    call_emscripten(cmdline)

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emscripten.py", line 1657, in _main

    temp_files.run_and_clean(lambda: main(

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/tools/tempfiles.py", line 64, in run_and_clean

    return func()

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emscripten.py", line 1663, in <lambda>

    DEBUG_CACHE=DEBUG_CACHE,

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emscripten.py", line 1560, in main

    temp_files=temp_files, DEBUG=DEBUG, DEBUG_CACHE=DEBUG_CACHE)

  File "/usr/local/Cellar/emscripten/1.35.23/libexec/emscripten.py", line 259, in emscript

    staticbump = metadata['staticBump']

KeyError: 'staticBump'

FAIL: Running the generated program failed!

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[Floh]

It looks like you're still running the emscripten version that was installed by brew:

File "/usr/local/Cellar/emscripten/1.35.23/libexec/emscripten.py", line 259, in ...

That path /usr/local/Cellar/... is a brew thing. You should really make sure that there is no trace of the previously installed emscripten version left on your system.

Cheers,
-Floh.

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[Shyamal Chandra]

Hi Floh and others,

Thanks for your advice in the previous email!

I  brew uninstall emscripten, installed and activated emsdk, and then I ran the emsdk with the source ./emsdk_env.sh and then I got the following C code from the examples for OpenGL...

https://www.opengl.org/archives/resources/code/samples/glut_examples/examples/abgr.c

and this is the error I got after emcc abgr.c -o abgr.html and opening the abgr.html file generated using Emscripten...

abgr.html:1249 missing function: glutExtensionSupportedModule.printErr @ abgr.html:1249

abgr.html:1237 -1

Uncaught abort(-1) at Error

    at jsStackTrace (file:///Users/iMe2/turingbrain/emscripten/abgr.js:1173:13)

    at stackTrace (file:///Users/iMe2/turingbrain/emscripten/abgr.js:1190:22)

    at abort (file:///Users/iMe2/turingbrain/emscripten/abgr.js:14356:44)

    at _glutExtensionSupported (file:///Users/iMe2/turingbrain/emscripten/abgr.js:6353:67)

    at _main (file:///Users/iMe2/turingbrain/emscripten/abgr.js:6673:9)

    at Object.asm._main (file:///Users/iMe2/turingbrain/emscripten/abgr.js:14107:19)

    at Object.callMain (file:///Users/iMe2/turingbrain/emscripten/abgr.js:14221:30)

    at doRun (file:///Users/iMe2/turingbrain/emscripten/abgr.js:14279:60)

    at file:///Users/iMe2/turingbrain/emscripten/abgr.js:14290:7

What should I do to fix this problem?  Does Emscripten fully support OpenGL and what flavors?

Thanks!

Shyamal Chandra 

shya...@gmail.com

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[Floh]

The problem here is the call to glutExtensionSupported("GL_EXT_abgr"). The glut functions aren't part of OpenGL, but of the GLUT framework. Emscripten emulates most GLUT calls, but it looks like glutExtensionSupported() isn't among the emulated functions. And even if it would be there, WebGL doesn't have the GL_EXT_abgr extension. So the demo you picked isn't very portable, and wouldn't run on WebGL anyway.

It is actually not that easy to find a GL demo that simply compiles in emscripten, you should start with a simple hello-world, and explore more complex things from there, e.g. this is what I do on OSX to find out whether an emscripten installation is working:

> cat >hello.c
#include <stdio.h>
int main() {
  printf("Hello World!\n");
}
[Ctrl-C]
> emcc hello.c hello.html
> ls
hello.c hello.html hello.js
> open hello.html

...the last command should open the default web-browser with the emscripten shell page and a "Hello World!" in a HTML text field.

-Floh,

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[Shyamal Chandra]

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[Shyamal Chandra]

Hi Floh and others,

Thanks for your help!

Best,

Shyamal

On Fri, Apr 22, 2016 at 4:23 PM, Floh <flo...@gmail.com> wrote:

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[Floh]

PS: typo here: > emcc hello.c hello.html, this should of course be

> emcc hello.c -o hello.html