Summary

It should be possible to use the following syntax in packages:

    has_code = True
    version("6.0", has_code=False)
    version("5.0", sha256="67865a0e3cdc7dec1fd676f0927f7011ad4036c18eb320a2b41dbd56282f33b8")

(or the converse).

Rationale

Xorg protocols used to be distributed as individual packages, but are now distributed as a bundle. One way to express this in spack is to have a multiple build system package for the individual protocols, with newer versions not containing code and deferring to the new combined Xorg protocols package as a dependency instead, using a BundlePackage as implementation. See discussion at #45569 (specifically #45569 (comment)).

Description

Adding has_code to directives.py is trivial enough, but the parsing of optional version attributes in fetch_strategy.py happens well after the pkg.has_code has been evaluated.

Additional information

No response

General information

• I have searched the issues of this repo and believe this is not a duplicate