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d1be154 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Compilation Issues
This page summarizes a list of questions related to the compilation and building of OpenTimer.
---
#### Q: What compiler does OpenTimer support now?
**A:** OpenTimer currently requires g++ v7.2 and clang++ v6.0 with -std=c++17.
#### Q: How do I switch to different compilers to compile OpenTimer?
**A:** OpenTimer uses CMake to manage the build process. You can switch to either g++ or clang++
by overriding the variable `CMAKE_CXX_COMPILER`.
```bash
# use clang++ to build OpenTimer
~$ cmake ../ -DCMAKE_CXX_COMPILER=clang++
~$ make
# use g++ to build OpenTimer
~$ cmake ../ -DCMAKE_CXX_COMPILER=g++
~$ make
```
#### Q: How can I clean up the entire project and rebuild the source?
**A:** When cmake gets messed up with different settings, you can remove
`build/CMakeCache.txt` or remove the entire `build` to start from scratch.
```bash
# remove CMake cached files
~$ make clean
~$ rm CMakeCache.txt
~$ cmake ../
~$ make
# or you can remove the entire build folder and start over
~$ rm -rf build
~$ mkdir build
~$ cd build
~$ cmake ../
~$ make
```
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