Project Build

Create the build and release directories in the udf_workspace/01_udf_add directory.

After the build is complete, the built .so file is generated in workspace/udf_add/release.

Create the build directory.
```
mkdir -p build
```
Create the release directory.
```
mkdir -p release
```
Go to the build directory.
```
cd build
```
Configure environment variables. The following uses the default path after Toolkit installation as a non-root user as an example. Run the following command based on the actual path of set_env.sh:
```
source ${HOME}/Ascend/cann/set_env.sh
```
The preceding environment variables take effect only in the current window. You can add the preceding commands to the environment variable configuration file (for example, the .bashrc file) as required.
Build the project.
- In a non-cross compilation scenario (the architectures of the development environment and operating environment are the same), the following is an example: Compile the .so file of the x86_64 type, set target lib to libadd.so, and use g++ as the compiler.
```
cmake .. -DTOOLCHAIN=g++ -DRELEASE_DIR=../release -DRESOURCE_TYPE=X86 -DUDF_TARGET_LIB=add && make
```
  - -DTOOLCHAIN: name of the compiler. For example, g++.
  - -DRELEASE_DIR: path for storing the target file after compilation.
  - -DRESOURCE_TYPE: type of the compiled resource (x86, AArch, or Ascend).
    - x86: Set this value to x86 if the target .so file needs to be deployed on the host with the x86 architecture.
    - AArch: Set this value to AArch if the target .so file needs to be deployed on the host of the AArch type.
    - Ascend: Set this value to Ascend if the target .so file needs to be deployed on the device.
  - -DUDF_TARGET_LIB: name of the target .so file after compilation. For example, if add is set, libadd.so is generated.
- In the cross compilation scenario (the development environment is x86_64 and the operating environment is AArch64), compile .so files of the Ascend type and set target lib to libadd.so. The compiler is ${INSTALL_DIR}/toolkit/toolchain/hcc/bin/aarch64-target-linux-gnu-g++. Replace ${INSTALL_DIR} with the CANN component directory. For example, if the installation is performed by the root user, the default file storage path is /usr/local/Ascend/cann.
  For example:
```
cmake .. -DTOOLCHAIN=${INSTALL_DIR}/toolkit/toolchain/hcc/bin/aarch64-target-linux-gnu-g++ -DRELEASE_DIR=../release -DRESOURCE_TYPE=Ascend -DUDF_TARGET_LIB=add && make
```

Parent topic: UDF Development