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# ROOT Recipe Notes
ROOT has a significant number of build options. Not all of them are supported by this package recipe at this time. Relevant notes on support (or lack thereof) for various options is below.
## Fixed and unsupported options
### Missing dependencies
The following configuration options are unsupported (set to `OFF`) due to missing dependencies:
#### `alien`
Requires `libgapiUI` from ALICE.
#### `gfal`
#### `monalisa`
Monitoring with Monalisa depends on `libapmoncpp`.
#### `odbc`
#### `tcmalloc`
#### `xinetd`
### Discontinued options
Support for several options was discontinued in ROOT without prior support in the recipe:
#### `afdsmgrd`
#### `afs`
#### `bonjour`
#### `castor`
#### `chirp`
#### `geocad`
#### `glite`
#### `globus`
#### `hdfs`
#### `ios`
#### `krb5`
#### `ldap`
#### `rfio`
#### `ruby`
#### `sapdb`
#### `srp`
### Other fixed or unsupported options
#### `arrow=OFF`
#### `asimage=ON`, `astiff=ON`, `builtin_afterimage=ON`
Full control of `asimage` and `astiff` would require a package recipe for libAfterImage or Afterstep. In their absence, we use the provided and internally built version of libAfterImage.
#### `ccache=OFF`
Only useful for repeated builds.
#### `cling=OFF`
The use of Cling is assumed.
#### `cxxmodules`
This option should not be confused with `runtime_cxxmodules`. `cxxmodules` is an optimization that affects only the efficiency of building ROOT.
#### `exceptions=ON`
Support for C++ exceptions is assumed.
#### `explicitlink=ON`
Use of explicit linking when making shared libraries is assumed.
#### `fail-on-missing=ON`
Failure on missing dependencies is assumed (_vs_ automatically setting `builtin_XXX`).
#### `gnuinstall=OFF`
GNU-compliant install layout.
#### `libcxx`
This option controls use of the libC++ standard C++ library via compiler options. It is set automatically by ROOT's configuration on macOS >=10.7 when a Clang compiler is configured. Due to complexities related to compiler options and the way a compiler might have been configured, configurable support is disabled until (at least) Spack supports the standard library as a virtual dependency.
#### `pch=ON`
The use of pre-compiled headers when building is assumed.
#### `roottest=OFF`
`roottest` requires access to the network.
#### `runtime_cxxmodules=OFF`
This option tells ROOT to generate and use PCMs for its own libraries. This functionality is experimental for ROOT < 6.20, and is currently not supported by the recipe.
#### `shared=ON`
The use of shared libraries is assumed.
#### `soversion=ON`
The use of versioning for shared libraries is assumed.
#### `testing`
The building of ROOT's test suite and its availability for use by CTest is pegged to Spack's determination of whether testing is required for the current installation procedure.
## Variants and version dependent support for options
Some configuration options are version dependent---unavailable before or after a specific version. The current accounting for such options in the recipe is far from exhaustive, and a survey of the various options and the versions that support them would be useful. However, accounting for them is somewhat clumsy absent a `when` clause for variants, or similar.
### Conflicting variants since 6.18
#### `memstat`
#### `qt4`
Representing the obsolete `qt` and `qtgsi` ROOT build options.
#### `table`
### Temporarily conflicting variants
## Permanently removed variants
The following variants have been removed from the recipe as they have always been ineffective:
* `avahi`
* `kerberos`
* `ldap`
* `libcxx`
* `odbc`
* `tiff`
In addition, the `test` variant has been removed as its actions are irrelevant to the installed source---the corresponding `testing` ROOT option is enabled if and only if `self.run_tests` is set.
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