spack/var/spack/repos/builtin/packages/root

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.

dcache

DCache support depends on libdcap from DESY.

gfal

http

ROOT looks for and uses the FastCGI package on the system if found, creating a possible non-portable dependency. There is currently no fastcgi recipe, nor any way to unconditionally disable the search for the package.

monalisa

Monitoring with Monalisa depends on libapmoncpp.

odbc

oracle

tcmalloc

veccore

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

The http variant is currently an unconditional conflict due to the non-portable dependency mentioned above.

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.