Preserve compiled libs

[trzecieu]

ATM emscripten image compiles all ports, but do not preserve output (due a size ~1GB), this might be done as a separated image emscripten-full

[remram44]

I'm also running into the issue that libclang.so is missing, which makes eg Rust builds fail.

[trzecieu]

Hi @remram44,
libclang is a part of https://packages.debian.org/stretch/libclang-3.9-dev
Can you try to run: sudo apt install libclang-3.9-dev before running the compilation?

I can complete the emscripten image with the missing dependency.

[remram44]

I'm getting:

/emsdk_portable/sdk/system/include/emscripten/emscripten.h:135:71: error: 'deprecated' attribute takes no more than 1 argument, err: true

if I install libclang-dev from apt first.

[trzecieu]

Interesting,
https://github.com/kripken/emscripten/blob/incoming/system/include/emscripten/emscripten.h#L135
It looks that this doesn't help at all to install the libclang, some of clang tools is used in compilation (from version 3.9 what has different signature for deprecated method).

I'll look if we can compile / preserve libclang from emscripten compilation step.

[trzecieu]

@remram44 I found it, it can be preserved. Do you have some minimal test case what I can run to verify if my patch works?

Alternatively you can extract llvm_clang_lib.tar.gz (from compiling latest version of Emscripten) to /emsdk_portable/llvm/clang/lib and see if this will just work.

--
After it I'll merge #25

[remram44]

I'm happy to test this. I can try to make a smaller Rust example.

[remram44]

Here's my minified example: https://github.com/remram44/test-rust-emscripten

[remram44]

Seems to work with the libs, and not without it. I'll let you know if my full project compiles, seems to be taking a while (would it be building the SDL2 port behind the scenes?)

[trzecieu]

Yes, none of ports are baked into the image.
I was able to reproduce error and test a hack fix. I'll test the branch from and once it works fine I'll update sdk-incoming.

Thank you for reporting

[remram44]

I can't seem to build the port, emcc ends up spawning more processes endlessly until my system runs out of memory (827 python /emsdk_portable/sdk/emcc processes right now); But I might be doing something wrong? (just ran emcc -s USE_SDL=2 helloworld.c)

[remram44]

Turns out setting EMMAKEN_CFLAGS='-s USE_SDL=2' causes the port build to recurse indefinitely. Looks like an upstream bug. Got everything working now, thanks for your very quick help!