Update README and compilation options

Also force installing recent version of libstdc++
on Travis-CI

Author: 4ian

.travis.yml

@@ -1,25 +1,27 @@
 language: cpp
 sudo: false
-compiler:
-  - gcc
 
 # Cache .npm folder for faster npm install
 cache:
   directories:
     - $HOME/.npm
 
-env:
-  global:
-    - GCC_VERSION="4.8"
-
 addons:
+  artifacts:
+    s3_region: "us-east-1"
+    paths:
+    - GDevelop/Binaries/Output/libGD.js/Release
   apt:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    #Build dependencies:
+    # Cmake 3+ is required by Emscripten
     - cmake3
-    - g++-4.8 # Required for latest libstdc++6
+
+before_install:
+  # This workaround is required to avoid libstdc++ errors (Emscripten requires a recent version of libstdc++)
+  - wget -q -O libstdc++6 http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.10_amd64.deb
+  - sudo dpkg --force-all -i libstdc++6
 
 install:
 # Emscripten

Gruntfile.js

@@ -71,9 +71,7 @@ module.exports = function(grunt) {
           cmakeBinary +
           ' ' +
           cmakeArgs +
-          ' ../.. -DCMAKE_TOOLCHAIN_FILE="' +
-          cmakeToolchainpath +
-          '" -DFULL_VERSION_NUMBER=FALSE -DCMAKE_EXPORT_COMPILE_COMMANDS=ON',
+          ' ../.. -DFULL_VERSION_NUMBER=FALSE',
         options: {
           execOptions: {
             cwd: buildPath,

Readme.md

@@ -16,8 +16,8 @@ How to build
 git clone https://github.com/juj/emsdk.git
 cd emsdk
 ./emsdk update
-./emsdk install latest
-./emsdk activate latest
+./emsdk install sdk-1.37.37-64bit
+./emsdk activate sdk-1.37.37-64bit
 source ./emsdk_env.sh
 ```
 
@@ -29,11 +29,11 @@ source ./emsdk_env.sh
     npm install -g grunt-cli
 ```
 
-* Clone [GDevelop repository](https://github.com/4ian/GD) and this repository at the root of GD repository:
+* Clone [GDevelop repository](https://github.com/4ian/GDevelop) and this repository at the root of GD repository:
 
 ```shell
-    git clone https://github.com/4ian/GD.git
-    cd GD && git clone https://github.com/4ian/GDevelop.js.git
+    git clone https://github.com/4ian/GDevelop.git
+    cd GDevelop && git clone https://github.com/4ian/GDevelop.js.git
 ```
 
 * Launch the build: