Cmake webinar

Cmake Arguments

Introduction: what it is and why we use it ?
- generation of build files ( Makefile for Unix systems)
- Supports all OS , competitor of GNU autotools
build process
- ( cd build; cmake ..;make; make install )
- make VERBOSE=1
typical project structure description
- CMakeLists.txt
- project requirement
- Subdirectories
- Languages
Cached variables. How to define variables, ccmake .. to get a list of cached variables.
Common configurations: Setting up compilers, CMAKE_BUILD_TYPE, CMAKE_INSTALL_PREFIX, CMAKE_PREFIX_PATH
findXXX ( findMPI)
Debugging
- Output inspection
- --trace-expand, --trace, --fresh
- Gotchas
  - findXXX does not find anything ( Blas, MPI , etc... )
  - findXXX finds the wrong library
  - old policy warnings
CTests ( ??? )

First we give an high level overview of what CMake is and what it can be used for.

Go trough the images in the Introduction pages. Present cmake as a build generator tool, and higher level of abstraction for compiling
Go to the Hello World example and demonstrate the configure/build/install process
Go to WindTunnel example and try to compile. Show how to see the list of variables and what they mean
Try to recompile windtunnel using the intel compilers and intel mpi
Try to recompile using the unwrapped MPI wrapper compiler and an external implementation of openmpi. Goal is to teach usage of -DPACKAGE_NAME_ROOT=
Go to MPI hello world example. Goal is to give the concept of a target and target properties
Show the need for policies by trying to use -DMPI_ROOT