33 lines
884 B
Markdown
33 lines
884 B
Markdown
|
# ROOT
|
||
|
|
|
||
|
|
ROOT is a C++ Toolkit for High Energy Physics. It is huge. There are really a lot of ways to use it in CMake, though many/most of the examples you'll find are probably wrong. Here's my recommendation.
|
||
|
|
|
||
|
|
|
||
|
|
## Finding ROOT
|
||
|
|
|
||
|
|
ROOT supports config file discovery, so you can just do:
|
||
|
|
|
||
|
|
```cmake
|
||
|
|
find_package(ROOT CONFIG)
|
||
|
|
```
|
||
|
|
|
||
|
|
to attempt to find ROOT. If you don't have your paths set up, you can pass `-DROOT_DIR=$ROOTSYS/cmake` to find ROOT. (But, really, you should source `thisroot.sh`)
|
||
|
|
|
||
|
|
## The wrong way
|
||
|
|
|
||
|
|
ROOT provides a utility to set up a ROOT project, which you can activate using `include(${ROOT_USE_FILE})`. This will automatically make ugly global variables for you. Don't use it.
|
||
|
|
|
||
|
|
## The right way (Targets)
|
||
|
|
|
||
|
|
ROOT does not correctly set up it's imported targets. To fix this error, you'll need something like:
|
||
|
|
|
||
|
|
```cmake
|
||
|
|
|
||
|
|
```
|
||
|
|
|
||
|
|
In CMake 3.11, you can just do:
|
||
|
|
|
||
|
|
```cmake
|
||
|
|
```
|
||
|
|
|