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# Compile xmr-stak
## Content Overview
* [Build System](#build-system)
* [Generic Build Options](#generic-build-options)
* [CPU Build Options](#cpu-build-options)
* [AMD Build Options](#amd-build-options)
* [NVIDIA Build Options](#nvidia-build-options)
* [Compile on Windows](compile_Windows.md)
* [Compile on Linux](compile_Linux.md)
* [Compile on FreeBSD](compile_FreeBSD.md)
## Build System
The build system is CMake, if you are not familiar with CMake you can learn more [here](https://cmake.org/runningcmake/).
By default the miner will be build with all dependencies. Each optional dependency can be disabled (this will reduce the miner features).
There are two easy ways to set variables for `cmake` to configure *xmr-stak*
- use the ncurses GUI
- `ccmake .`
- edit your options
- end the GUI by pressing the key `c`(create) and than `g`(generate)
- set Options on the command line
- enable a option: `cmake . -DNAME_OF_THE_OPTION=ON`
- disable a option `cmake . -DNAME_OF_THE_OPTION=OFF`
- set a value `cmake . -DNAME_OF_THE_OPTION=value`
After the configuration you need to compile the miner, follow the guide for your platform:
* [Compile in Windows](compile_Windows.md)
* [Compile in Linux](compile_Linux.md)
* [Compile in FreeBSD](compile_FreeBSD.md)
## Generic Build Options
- `CMAKE_INSTALL_PREFIX` install miner to the home folder
- `cmake . -DCMAKE_INSTALL_PREFIX=$HOME/xmr-stak-cpu`
- you can find the binary and the `config.txt` file after `make install` in `$HOME/xmr-stak-cpu/bin`
- `CMAKE_LINK_STATIC` link libgcc and libstdc++ libraries static (default OFF)
- disable with `cmake . -DCMAKE_LINK_STATIC=ON`
- `CMAKE_BUILD_TYPE` set the build type
- valid options: `Release` or `Debug`
- you should always keep `Release` for your productive miners
- `MICROHTTPD_ENABLE` allow to disable/enable the dependency *microhttpd*
- there is no *http* interface available if option is disabled: `cmake . -DMICROHTTPD_ENABLE=OFF`
- `OpenSSL_ENABLE` allow to disable/enable the dependency *OpenSSL*
- it is not possible to connect to a *https* secured pool if option is disabled: `cmake . -DOpenSSL_ENABLE=OFF`
## CPU Build Options
- `CPU_ENABLE` allow to disable/enable the CPU backend of the miner
- `HWLOC_ENABLE` allow to disable/enable the dependency *hwloc*
- the config suggestion is not optimal if option is disabled: `cmake . -DHWLOC_ENABLE=OFF`
- disabling can be reduce the miner performance
## AMD Build Options
- `OpenCL_ENABLE` allow to disable/enable the AMD backend of the miner
## NVIDIA Build Options
- `CUDA_ENABLE` allow to disable/enable the NVIDIA backend of the miner
- `CUDA_ARCH` build for a certain compute architecture
- this option needs a semicolon separated list
- `cmake . -DCUDA_ARCH=61` or `cmake . -DCUDA_ARCH=20;61`
- [list](https://developer.nvidia.com/cuda-gpus) with NVIDIA compute architectures
- by default the miner is created for all currently available compute architectures
- `CUDA_COMPILER` select the compiler for the device code
- valid options: `nvcc` or `clang` if clang 3.9+ is installed
```
# compile host and device code with clang
export CC=/usr/bin/clang
export CXX=/usr/bin/clang++
cmake . -DCUDA_COMPILER=clang
```
- `XMR-STAK_LARGEGRID` use `32` or `64` bit integer for on device indices
- default is enabled
- on old GPUs it can increase the hash rate if disabled: `cmake . -DXMR-STAK_LARGEGRID=OFF`
- if disabled it is not allowed to use more than `1000` threads on the device
- `XMR-STAK_THREADS` give the compiler information which value for `threads` is used at runtime
- default is `0` (compile time optimization)
- if the miner is compiled and used at runtime with the some value it can increase the hash rate: `cmake . -DXMR-STAK_THREADS=32`
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