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Revisions

  1. @yurydelendik yurydelendik revised this gist Feb 28, 2018. 1 changed file with 2 additions and 0 deletions.
    2 changes: 2 additions & 0 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -1,3 +1,5 @@
    NOTE: the content is out-of-date. All development is moved to the https://github.com/yurydelendik/wasmception

    # Using WebAssembly in LLVM

    ## Compiling
  2. @yurydelendik yurydelendik revised this gist Nov 21, 2017. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -16,7 +16,7 @@ cd $WORKDIR/llvm/tools
    svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    # checkout lld
    git clone https://github.com/WebAssembly/lld.git -b wasm
    svn co http://llvm.org/svn/llvm-project/lld/trunk lld
    # build folder (~14 min; ~1 hour /wo -j)
    mkdir $WORKDIR/llvm-build
  3. @yurydelendik yurydelendik revised this gist Nov 16, 2017. 1 changed file with 3 additions and 0 deletions.
    3 changes: 3 additions & 0 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -15,6 +15,9 @@ svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
    cd $WORKDIR/llvm/tools
    svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    # checkout lld
    git clone https://github.com/WebAssembly/lld.git -b wasm
    # build folder (~14 min; ~1 hour /wo -j)
    mkdir $WORKDIR/llvm-build
    cd $WORKDIR/llvm-build
  4. @yurydelendik yurydelendik revised this gist Feb 7, 2017. 1 changed file with 2 additions and 6 deletions.
    8 changes: 2 additions & 6 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -15,16 +15,12 @@ svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
    cd $WORKDIR/llvm/tools
    svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    # sanitizers
    cd $WORKDIR/llvm/projects
    svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
    # build folder (~14 min; ~1 hour /wo -j)
    mkdir $WORKDIR/llvm-build
    cd $WORKDIR/llvm-build
    # For Debug build:
    # cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly -DCMAKE_BUILD_TYPE=Debug $WORKDIR/llvm
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORKDIR/llvm
    # cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly -DCMAKE_BUILD_TYPE=Debug $WORKDIR/llvm
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_TARGETS_TO_BUILD= -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORKDIR/llvm
    make -j 8
    # install llvm
  5. @yurydelendik yurydelendik revised this gist Nov 10, 2016. 1 changed file with 58 additions and 0 deletions.
    58 changes: 58 additions & 0 deletions Makefile
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,58 @@
    ROOT_DIR=$(shell pwd)
    LLVM_WORKDIR=$(ROOT_DIR)/src/llvm
    LLVM_BUILDDIR=$(ROOT_DIR)/build/llvm
    BINARYEN_WORKDIR=$(ROOT_DIR)/src/binaryen
    BINARYEN_BUILDDIR=$(ROOT_DIR)/build/binaryen
    INSTALLDIR=$(ROOT_DIR)/bin

    build: build-llvm build-binaryen

    clean: clean-llvm clean-binaryen
    rm -rf $(INSTALLDIR)

    install: install-llvm install-binaryen

    $(LLVM_WORKDIR)/.svn:
    rm -rf $(LLVM_WORKDIR)
    mkdir -p $(LLVM_WORKDIR)
    svn co http://llvm.org/svn/llvm-project/llvm/trunk $(LLVM_WORKDIR)
    svn co http://llvm.org/svn/llvm-project/cfe/trunk $(LLVM_WORKDIR)/tools/clang
    svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk $(LLVM_WORKDIR)/projects/compiler-rt

    $(LLVM_BUILDDIR)/Makefile: $(LLVM_WORKDIR)/.svn
    mkdir -p $(LLVM_BUILDDIR)
    cd $(LLVM_BUILDDIR); cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$(INSTALLDIR) -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly -DLLVM_TARGETS_TO_BUILD= -DCMAKE_BUILD_TYPE=Release $(LLVM_WORKDIR)

    build-llvm: $(LLVM_BUILDDIR)/Makefile
    $(MAKE) -C $(LLVM_BUILDDIR) -j 8 clang llc llvm-lib

    clean-llvm:
    rm -rf $(LLVM_WORKDIR)
    rm -rf $(LLVM_BUILDDIR)

    install-llvm:
    mkdir -p $(INSTALLDIR)
    $(MAKE) -C $(LLVM_BUILDDIR) install-clang install-llc install-llvm-lib

    $(BINARYEN_WORKDIR)/.git:
    rm -rf $(BINARYEN_WORKDIR)
    mkdir -p $(BINARYEN_WORKDIR)
    git clone https://github.com/WebAssembly/binaryen $(BINARYEN_WORKDIR)

    $(BINARYEN_BUILDDIR)/Makefile: $(BINARYEN_WORKDIR)/.git
    mkdir -p $(BINARYEN_BUILDDIR)
    cd $(BINARYEN_BUILDDIR); cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$(INSTALLDIR) -DCMAKE_BUILD_TYPE=Release $(BINARYEN_WORKDIR)

    build-binaryen: $(BINARYEN_BUILDDIR)/Makefile
    $(MAKE) -C $(BINARYEN_BUILDDIR) -j 8 wasm-as wasm-dis s2wasm

    clean-binaryen:
    rm -rf $(BINARYEN_WORKDIR)
    rm -rf $(BINARYEN_BUILDDIR)

    install-binaryen:
    mkdir -p $(INSTALLDIR)
    cp $(addprefix $(BINARYEN_BUILDDIR)/bin/, wasm-as wasm-dis s2wasm) $(INSTALLDIR)

    .PHONY: build clean install build-llvm clean-llvm install-llvm build-binaryen clean-binaryen install-binaryen

  6. @yurydelendik yurydelendik revised this gist May 27, 2016. 1 changed file with 3 additions and 1 deletion.
    4 changes: 3 additions & 1 deletion !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -22,6 +22,8 @@ svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
    # build folder (~14 min; ~1 hour /wo -j)
    mkdir $WORKDIR/llvm-build
    cd $WORKDIR/llvm-build
    # For Debug build:
    # cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly -DCMAKE_BUILD_TYPE=Debug $WORKDIR/llvm
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORKDIR/llvm
    make -j 8
    @@ -38,7 +40,7 @@ $INSTALLDIR/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $INSTALLDIR/bin/llc -asm-verbose=false -o fib.s fib.bc
    ```

    See output at fib.wasm0.
    See output at fib.s.

    Convert to WebAssebly s-expressions (needs binaryen s2wasm tool):

  7. @yurydelendik yurydelendik revised this gist May 27, 2016. 1 changed file with 3 additions and 7 deletions.
    10 changes: 3 additions & 7 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -27,10 +27,6 @@ make -j 8
    # install llvm
    make install
    # install scaffolding tools (optional)
    cd $WORKDIR
    git clone https://github.com/WebAssembly/experimental.git
    ```

    ## Example
    @@ -39,15 +35,15 @@ Let's create "fib.c" and compile it, first to LLVM bitcode, then to WebAssembly-

    ```
    $INSTALLDIR/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $INSTALLDIR/bin/llc -asm-verbose=false -o fib.wasm0 fib.bc
    $INSTALLDIR/bin/llc -asm-verbose=false -o fib.s fib.bc
    ```

    See output at fib.wasm0.

    Convert to WebAssebly s-expressions (needs the wasmate scaffolding tools):
    Convert to WebAssebly s-expressions (needs binaryen s2wasm tool):

    ```
    python $WORKDIR/experimental/prototype-wasmate/wasmate.py < fib.wasm0 > fib.wast
    $BINARYENDIR/bin/s2wasm fib.s > fib.wast
    ```

    See output at fib.wast.
  8. @yurydelendik yurydelendik revised this gist May 18, 2016. 1 changed file with 23 additions and 0 deletions.
    23 changes: 23 additions & 0 deletions compile.sh
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,23 @@
    #/bin/bash
    llvm_root=~/llvmwasm/llvm-build/bin
    binaryen_root=~/llvmwasm/binaryen/bin

    cfile=$1
    bcfile=${cfile%.*}.bc
    sfile=${cfile%.*}.s
    wastfile=${cfile%.*}.wast

    $llvm_root/clang -emit-llvm --target=wasm32 -Oz "$cfile" -c -o "$bcfile"
    if [ $? != 0 ];then
    exit 1
    fi

    $llvm_root/llc -asm-verbose=false -o "$sfile" "$bcfile"
    if [ $? != 0 ];then
    exit 2
    fi

    $binaryen_root/s2wasm "$sfile" > "$wastfile"
    if [ $? != 0 ];then
    exit 3
    fi
  9. @yurydelendik yurydelendik revised this gist Oct 8, 2015. 1 changed file with 24 additions and 13 deletions.
    37 changes: 24 additions & 13 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -3,40 +3,51 @@
    ## Compiling

    ```
    # locations, e.g.
    export WORKDIR=~/llvmwasm; mkdir -p $WORKDIR
    export INSTALLDIR=$WORKDIR
    # checkout LLVM
    cd $WORK
    cd $WORKDIR
    svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
    # checkout clang
    cd $WORK/llvm/tools
    cd $WORKDIR/llvm/tools
    svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    # sanitizers
    cd $WORK/llvm/projects
    cd $WORKDIR/llvm/projects
    svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
    # build folder (~1 hour /wo threads)
    mkdir $WORK/llvm-build
    cd $WORK/llvm-build
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$PREFIX -DEXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORK/llvm
    make
    # build folder (~14 min; ~1 hour /wo -j)
    mkdir $WORKDIR/llvm-build
    cd $WORKDIR/llvm-build
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$INSTALLDIR -DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORKDIR/llvm
    make -j 8
    # install llvm
    make install
    # install scaffolding tools (optional)
    cd $WORKDIR
    git clone https://github.com/WebAssembly/experimental.git
    ```

    ## Example

    Let's create "fib.c" and compile it first to LLVM bitcode then to WebAssebly-like file.
    Let's create "fib.c" and compile it, first to LLVM bitcode, then to WebAssembly-like file. (Notice -O2 or above near clang to avoid failure during `llc` run.)

    ```
    $PREFIX/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $PREFIX/bin/llc -asm-verbose=false -o fib.wasm0 fib.bc
    $INSTALLDIR/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $INSTALLDIR/bin/llc -asm-verbose=false -o fib.wasm0 fib.bc
    ```

    See output at fib.wasm0.

    Convert to WebAssebly s-expressions (needs scaffolding tools installed by `cd $WORK; git clone https://github.com/WebAssembly/experimental.git`):
    Convert to WebAssebly s-expressions (needs the wasmate scaffolding tools):

    ```
    python $WORK/experimental/prototype-wasmate/wasmate.py < fib.wasm0 > fib.wast
    python $WORKDIR/experimental/prototype-wasmate/wasmate.py < fib.wasm0 > fib.wast
    ```

    See output at fib.wast.
  10. @yurydelendik yurydelendik revised this gist Oct 8, 2015. 1 changed file with 0 additions and 8 deletions.
    8 changes: 0 additions & 8 deletions add-cmake-wasm.patch
    View file
    Original file line number Diff line number Diff line change
    @@ -1,8 +0,0 @@
    --- CMakeLists.txt (revision 249591)
    +++ CMakeLists.txt (working copy)
    @@ -194,6 +194,7 @@
    SystemZ
    X86
    XCore
    + WebAssembly
    )
  11. @yurydelendik yurydelendik revised this gist Oct 7, 2015. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -28,7 +28,7 @@ Let's create "fib.c" and compile it first to LLVM bitcode then to WebAssebly-lik

    ```
    $PREFIX/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -asm-verbose=false -o fib.wasm0 fib.bc
    $PREFIX/bin/llc -asm-verbose=false -o fib.wasm0 fib.bc
    ```

    See output at fib.wasm0.
  12. @yurydelendik yurydelendik revised this gist Oct 7, 2015. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -27,7 +27,7 @@ make
    Let's create "fib.c" and compile it first to LLVM bitcode then to WebAssebly-like file.

    ```
    $PREFIX/bin/clang -emit-llvm -Oz fib.c -c -o fib.bc
    $PREFIX/bin/clang -emit-llvm --target=wasm32 -Oz fib.c -c -o fib.bc
    $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -asm-verbose=false -o fib.wasm0 fib.bc
    ```

  13. @yurydelendik yurydelendik revised this gist Oct 7, 2015. 3 changed files with 75 additions and 40 deletions.
    8 changes: 8 additions & 0 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -33,6 +33,14 @@ $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -asm-verbose=false -o fib.wasm0 fib.bc

    See output at fib.wasm0.

    Convert to WebAssebly s-expressions (needs scaffolding tools installed by `cd $WORK; git clone https://github.com/WebAssembly/experimental.git`):

    ```
    python $WORK/experimental/prototype-wasmate/wasmate.py < fib.wasm0 > fib.wast
    ```

    See output at fib.wast.

    ## References

    * http://llvm.org/docs/GettingStarted.html
    75 changes: 35 additions & 40 deletions fib.wasm0
    View file
    Original file line number Diff line number Diff line change
    @@ -1,41 +1,36 @@
    .text
    .macosx_version_min 10, 10
    .file "fib.bc"
    .globl fib
    .type fib,@function
    fib: # @fib
    .param i32
    .result i32
    # BB#0: # %entry
    block $BB0_3
    i32.const 1
    set_local @9, pop
    i32.const 0
    set_local @13, pop
    i32.const -1
    set_local @12, pop
    @0
    set_local @6, pop
    @9
    set_local @14, pop
    BB0_1: # %for.cond
    # =>This Inner Loop Header: Depth=1
    loop $BB0_3
    add @12, @9
    set_local @12, pop
    sge @12, @6
    set_local @11, pop
    brif $BB0_3, @11
    # BB#2: # %for.body
    # in Loop: Header=BB0_1 Depth=1
    add @14, @13
    set_local @5, pop
    @14
    set_local @13, pop
    @5
    set_local @14, pop
    br $BB0_1
    BB0_3: # %for.end
    return @14
    .text
    .file "fib.bc"
    .globl fib
    .type fib,@function
    fib:
    .param i32
    .result i32
    block $BB0_3
    i32.const 1
    set_local @9, pop
    i32.const 0
    set_local @13, pop
    i32.const -1
    set_local @12, pop
    @0
    set_local @6, pop
    @9
    set_local @14, pop
    BB0_1:
    loop $BB0_3
    add @12, @9
    set_local @12, pop
    sge @12, @6
    set_local @11, pop
    brif $BB0_3, @11
    add @14, @13
    set_local @5, pop
    @14
    set_local @13, pop
    @5
    set_local @14, pop
    br $BB0_1
    BB0_3:
    return @14
    func_end0:
    .size fib, func_end0-fib
    .size fib, func_end0-fib
    32 changes: 32 additions & 0 deletions fib.wast
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,32 @@
    (module
    (import $print_i32 "stdio" "print" (param i32))
    (import $print_f32 "stdio" "print" (param f32))
    (import $print_i64 "stdio" "print" (param i64))
    (import $print_f64 "stdio" "print" (param f64))
    (func $fib
    (param i32)
    (result i32)
    (block $BB0_3
    (set_local @9 (i32.const 1))
    (set_local @13 (i32.const 0))
    (set_local @12 (i32.const -1))
    (set_local @6 (@0))
    (set_local @14 (@9))
    (loop $BB0_1
    (set_local @12 (add @12 @9))
    (set_local @11 (sge @12 @6))
    (brif $BB0_3 @11)
    (set_local @5 (add @14 @13))
    (set_local @13 (@14))
    (set_local @14 (@5))
    (br $BB0_1)
    )
    )
    (return @14)
    )
    (memory 0 0
    (segment 0
    ""
    )
    )
    )
  14. @yurydelendik yurydelendik revised this gist Oct 7, 2015. 1 changed file with 3 additions and 4 deletions.
    7 changes: 3 additions & 4 deletions !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -15,12 +15,10 @@ svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    cd $WORK/llvm/projects
    svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
    # !! Changed CMakeList.txt file to add WebAssembly (see add-cmake-wasm.patch below)
    # build folder (~1 hour /wo threads)
    mkdir $WORK/llvm-build
    cd $WORK/llvm-build
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$PREFIX $WORK/llvm
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$PREFIX -DEXPERIMENTAL_TARGETS_TO_BUILD=WebAssembly $WORK/llvm
    make
    ```

    @@ -38,4 +36,5 @@ See output at fib.wasm0.
    ## References

    * http://llvm.org/docs/GettingStarted.html
    * http://llvm.org/svn/llvm-project/llvm/trunk/lib/Target/WebAssembly/
    * http://llvm.org/svn/llvm-project/llvm/trunk/lib/Target/WebAssembly/
    * https://github.com/llvm-mirror/llvm/tree/master/test/CodeGen/WebAssembly
  15. @yurydelendik yurydelendik revised this gist Oct 7, 2015. 1 changed file with 1 addition and 1 deletion.
    2 changes: 1 addition & 1 deletion !wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -30,7 +30,7 @@ Let's create "fib.c" and compile it first to LLVM bitcode then to WebAssebly-lik

    ```
    $PREFIX/bin/clang -emit-llvm -Oz fib.c -c -o fib.bc
    $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -o fib.wasm0 fib.bc
    $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -asm-verbose=false -o fib.wasm0 fib.bc
    ```

    See output at fib.wasm0.
  16. @yurydelendik yurydelendik renamed this gist Oct 7, 2015. 1 changed file with 0 additions and 0 deletions.
    0 wasmllvm.md → !wasmllvm.md
    View file
    File renamed without changes.
  17. @yurydelendik yurydelendik created this gist Oct 7, 2015.
    8 changes: 8 additions & 0 deletions add-cmake-wasm.patch
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,8 @@
    --- CMakeLists.txt (revision 249591)
    +++ CMakeLists.txt (working copy)
    @@ -194,6 +194,7 @@
    SystemZ
    X86
    XCore
    + WebAssembly
    )
    7 changes: 7 additions & 0 deletions fib.c
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,7 @@
    int fib(int n) {
    int i, t, a = 0, b = 1;
    for (i = 0; i < n; i++) {
    t = a + b; a = b; b = t;
    }
    return b;
    }
    41 changes: 41 additions & 0 deletions fib.wasm0
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,41 @@
    .text
    .macosx_version_min 10, 10
    .file "fib.bc"
    .globl fib
    .type fib,@function
    fib: # @fib
    .param i32
    .result i32
    # BB#0: # %entry
    block $BB0_3
    i32.const 1
    set_local @9, pop
    i32.const 0
    set_local @13, pop
    i32.const -1
    set_local @12, pop
    @0
    set_local @6, pop
    @9
    set_local @14, pop
    BB0_1: # %for.cond
    # =>This Inner Loop Header: Depth=1
    loop $BB0_3
    add @12, @9
    set_local @12, pop
    sge @12, @6
    set_local @11, pop
    brif $BB0_3, @11
    # BB#2: # %for.body
    # in Loop: Header=BB0_1 Depth=1
    add @14, @13
    set_local @5, pop
    @14
    set_local @13, pop
    @5
    set_local @14, pop
    br $BB0_1
    BB0_3: # %for.end
    return @14
    func_end0:
    .size fib, func_end0-fib
    41 changes: 41 additions & 0 deletions wasmllvm.md
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,41 @@
    # Using WebAssembly in LLVM

    ## Compiling

    ```
    # checkout LLVM
    cd $WORK
    svn co http://llvm.org/svn/llvm-project/llvm/trunk llvm
    # checkout clang
    cd $WORK/llvm/tools
    svn co http://llvm.org/svn/llvm-project/cfe/trunk clang
    # sanitizers
    cd $WORK/llvm/projects
    svn co http://llvm.org/svn/llvm-project/compiler-rt/trunk compiler-rt
    # !! Changed CMakeList.txt file to add WebAssembly (see add-cmake-wasm.patch below)
    # build folder (~1 hour /wo threads)
    mkdir $WORK/llvm-build
    cd $WORK/llvm-build
    cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=$PREFIX $WORK/llvm
    make
    ```

    ## Example

    Let's create "fib.c" and compile it first to LLVM bitcode then to WebAssebly-like file.

    ```
    $PREFIX/bin/clang -emit-llvm -Oz fib.c -c -o fib.bc
    $PREFIX/bin/llc -march=wasm32 -mcpu=mvp -o fib.wasm0 fib.bc
    ```

    See output at fib.wasm0.

    ## References

    * http://llvm.org/docs/GettingStarted.html
    * http://llvm.org/svn/llvm-project/llvm/trunk/lib/Target/WebAssembly/