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CMake README documentation on <PackageName>_ROOT variables #2190

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Add documentation note about advanced dependency control
islas Apr 1, 2025
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Revise final sentence in *_ROOT variable not to clarify expected beha…
islas Apr 21, 2025
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29 changes: 29 additions & 0 deletions doc/README.cmake_build
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Expand Up @@ -152,6 +152,35 @@ Advanced Configuration
WRF_CASE option. Note that the value used is the actual name of the value, not
the numeric shorthand used during interactive dialog.

Note: When using the cmake `*_ROOT` package variables to control where certain
depenendencies are found, please refer to the top-level CMakeLists.txt
(i.e. <your WRF dir>/CMakeLists.txt) for all instances of `find_package()`
for the latest accurate list of all possible values. The construction of the
respective `*_ROOT` variable for a package uses the name in the call to
`find_package( <PackageName> )` verbatim and *is case sensitive* resulting
in `<PackageName>_ROOT`.

The current list of possible `*_ROOT` is as follows :
Dependecies always used :
* netCDF_ROOT
* netCDF-Fortran_ROOT
* ZLIB_ROOT

Conditional depenendencies based on configuration:
* MPI_ROOT
* OpenMP_ROOT
* HDF5_ROOT
* Jasper_ROOT
* RPC_ROOT
* BISON_ROOT
* FLEX_ROOT

One can make use of passing in `CMAKE_PREFIX_PATH` to provide a lower priority
general search location if multiple depenendencies reside in the same directory.
Please refer to https://cmake.org/cmake/help/v3.20/command/find_package.html
for further documentation on using `*_ROOT` variables or other control methods
of resolving depenendency locations. Please note the version specification
as WRF uses the logic of CMake v3.20 even if you have a newer version of cmake installed.

- The 'compile_new' has a complimentary feature to pair with 'configure_new'.
This feature is specifying an alternate build directory to use as a compile
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