Dockerfile

# Dockerfile for COMPILATION C++ into JS using EMSCRIPTEN

FROM stackbrew/ubuntu:saucy
MAINTAINER "Victor Laskin"

RUN apt-get update
RUN apt-get install -y --no-install-recommends \
	wget curl apache2 \
    ca-certificates git build-essential make cmake scons \
    python nodejs default-jre-headless clang-3.4 llvm-3.4

RUN git clone --depth=1 https://github.com/kripken/emscripten /opt/emscripten
RUN for prog in em++ em-config emar emcc emconfigure emmake emranlib emrun emscons; do \
  ln -sf /opt/emscripten/$prog /usr/local/bin; done

RUN git clone https://github.com/kripken/emscripten-fastcomp /opt/emscripten-fastcomp && \
	cd /opt/emscripten-fastcomp && \
	git clone https://github.com/kripken/emscripten-fastcomp-clang tools/clang && \
	mkdir build

RUN cd /opt/emscripten-fastcomp/build && cmake .. -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD="X86;JSBackend" -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_TESTS=OFF -DCLANG_INCLUDE_EXAMPLES=OFF -DCLANG_INCLUDE_TESTS=OFF
	
RUN cd /opt/emscripten-fastcomp/build && make && ls /opt/emscripten-fastcomp/build/bin

# set LLVM_ROOT variable inside ~/.emscripten
RUN emcc -v && cd ~ && sed -i.bak 's/^\(LLVM_ROOT = \).*/\1"\/opt\/emscripten-fastcomp\/build\/bin"/' .emscripten && cat .emscripten

# lets print out some enviroment variables
RUN emcc -v && \
	cat ~/.emscripten

# build an example code 
RUN emcc --version && \
    mkdir -p /tmp/emscripten_temp && cd /tmp/emscripten_temp && \
    EMCC_FORCE_STDLIBS=1 em++ -O2 /opt/emscripten/tests/hello_world_sdl.cpp -o hello.js && \
    (nodejs hello.js 2> /dev/null | grep hello) && \
    rm -rf /tmp/emscripten_temp


# Setup apache 

ENV APACHE_RUN_USER www-data
ENV APACHE_RUN_GROUP www-data
ENV APACHE_LOG_DIR /var/log/apache2
ENV APACHE_LOCK_DIR /var/lock/apache2
ENV APACHE_PID_FILE /var/run/apache2.pid
EXPOSE 80

# Make and put example into /var/www 
RUN mkdir /src
COPY . /src 
RUN cd /src && ls && make all && ls && cp *.js /var/www && cp *.html /var/www && cp *.html.mem /var/www && ls /var/www 


CMD /usr/sbin/apache2ctl -D FOREGROUND

main.cpp

#include <iostream>

#ifdef EMSCRIPTEN
#include <emscripten.h>
#endif

using namespace std;

int main()
{
	[](){ cout << "HELLO from C++11" << endl; }();

	return 0;
}

makefile

CC=em++
SOURCES=main.cpp
OBJECTS=$(SOURCES:.cpp=.bc)
LDFLAGS=-O2 --llvm-opts 2
OUTPUT=test.html

all: $(OUTPUT)

$(OUTPUT): $(OBJECTS) 
	$(CC) -o $@ $(OBJECTS) -s FULL_ES2=1 -std=c++11 $(LDFLAGS) 

%.bc: %.cpp
	$(CC) -s FULL_ES2=1 -std=c++11 $(LDFLAGS) -o $@ $<