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Packages can implement “detect_version” to support detection of external instances of a package. This is generally easier than implementing “determine_spec_details”. The API for determine_version is similar: for example you can return “None” to indicate that an executable is not an instance of a package. Users may implement a “determine_variants” method for a package. When doing external detection, executables are grouped by version and each group results in a single invocation of “determine_variants” for the associated spec. The method returns a string specifying the variants for the package. The method may additionally return a dictionary representing extra attributes for the package. These will be stored in the spec yaml and can be retrieved from self.spec.extra_attributes The Spack GCC package has been updated with an implementation of “determine_variants” which adds the following extra attributes to the package: c, cxx, fortran |
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