Steps to reproduce

$ spack install netcdf-c~mpi~zstd build_system=autotools ^hdf5~mpi
$ spack install netcdf-c~mpi~zstd build_system=cmake ^hdf5~mpi

Error message

Both builders (CMakeBuilder and AutotoolsBuilder) of netcdf-c inherit from BackupStep, which implements a run_after("install") method backup_nc_config. However, the method is run only when build_system=cmake. If we swap the declaration of the builders, i.e. instead of

class CMakeBuilder(...):
    ...

class AutotoolsBuilder(...):
    ...

we do

class AutotoolsBuilder(...):
    ...

class CMakeBuilder(...):
    ...

the backup_nc_config will run only when build_system=autotools.

I see a similar pattern in proj (@adamjstewart FYI) where the install_datum_grids method is run when build_system=cmake but is not run when build_system=autotools (given the issue reported in #36688 is resolved).

@alalazo is probably the right person to mention here.

Information on your system

• Spack: 0.20.0.dev0 (74ad92e)
• Python: 3.9.2
• Platform: linux-debian11-skylake
• Concretizer: clingo

General information

• I have run spack debug report and reported the version of Spack/Python/Platform
• I have searched the issues of this repo and believe this is not a duplicate
• I have run the failing commands in debug mode and reported the output