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# Build ObjectWriter library #
ObjWriter is based on LLVM, so it requires recent CMake and GCC/Clang to build LLVM.
See http://llvm.org/docs/GettingStarted.html#requirements for more details.
1. Clone LLVM from official LLVM mirror github git repository:
```
$ git clone -b release_50 https://github.com/llvm-mirror/llvm.git
```
2. Copy ObjWriter directory from CoreRT into LLVM tree
```
$ cp -r CoreRT/src/Native/ObjWriter llvm/tools/
```
3. Apply the patch to LLVM:
```
$ cd llvm
$ git apply tools/ObjWriter/llvm.patch
```
4. Configure and build LLVM with ObjWriter:
```
$ mkdir build
$ cd build
$ cmake ../ -DCMAKE_BUILD_TYPE=Release -DLLVM_OPTIMIZED_TABLEGEN=1 -DHAVE_POSIX_SPAWN=0 -DLLVM_ENABLE_PIC=1 -DLLVM_BUILD_TESTS=0 -DLLVM_ENABLE_DOXYGEN=0 -DLLVM_INCLUDE_DOCS=0 -DLLVM_INCLUDE_TESTS=0
$ make -j10 objwriter
$ cd ..
```
* You can change the building type(CMAKE_BUILD_TYPE) to the debugging type(Debug), if necessary to debug ObjWriter.
* Also, you can do this under chroot to building ObjWriter for other platforms.
5. Get ObjWriter:
If all goes well, the build will complete in the previous step and you will get ObjWriter library as llvm/build/lib/libobjwriter.so
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