Merge pull request #86 from elmato/update-readme-wasm-toolchain

Instructions to perform a full build with the WASM toolchain

README.md

@@ -112,11 +112,26 @@ Done
 By default LLVM and clang do not include the WASM build target, so you will have to build it yourself. Note that following these instructions will create a version of LLVM that can only build WASM targets.
 
 ```
-git clone --depth 1 --single-branch --branch release_40 [email protected]:llvm-mirror/llvm.git
+mkdir  ~/wasm-compiler
+cd ~/wasm-compiler
+git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/llvm.git
 cd llvm/tools
-git clone --depth 1 --single-branch --branch release_40 [email protected]:llvm-mirror/clang.git
+git clone --depth 1 --single-branch --branch release_40 https://github.com/llvm-mirror/clang.git
+cd ..
 mkdir build
 cd build
 cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=.. -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly -DCMAKE_BUILD_TYPE=Release ../
+make -j4 install
 ```
 
+### Using the WASM compiler to perform a full build of the project
+
+The WASM_LLVM_CONFIG environment variable is used to find our recently built WASM compiler.
+This is needed to compile the example contracts insde eos/contracts folder and their respective tests.
+
+```
+git clone https://github.com/eosio/eos --recursive
+mkdir -p eos/build && cd eos/build
+WASM_LLVM_CONFIG=~/wasm-compiler/llvm/bin/llvm-config cmake ..
+make -j4
+```