occlum/demo/hello_c/README.md

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# C Sample Project with Makefile and CMake
This project demonstrates how to use Makefile/CMake to build C projects for Occlum.
1. Build `hello_world` with Makefile
```
make
```
Or you can build `hello_world` with CMake
```
mkdir build && cd build
cmake ../ -DCMAKE_C_COMPILER=occlum-gcc -DCMAKE_C_FLAGS="-fPIC -pie"
make
cd ..
cp build/hello_world .
```
Either way, the resulting `hello_world` can be found in the current directory.
2. (Optional) Run `hello_world` on Linux
```
./hello_world
```
3. Run `hello_world` on Occlum
```
mkdir occlum_workspace && cd occlum_workspace
occlum init
cp ../hello_world image/bin
occlum build
occlum run /bin/hello_world
```