* Bump the package API of the `builtin` repo to `v2.0`
* Move `var/spack/repos/builtin` -> `var/spack/repos/spack_repo/builtin`
* Move test repos `var/spack/repos/{builtin.mock,tutorial,...}` -> `var/spack/test_repos/`
* Update package dir names to v2 format (`-` -> `_` etc)
* Change absolute imports `from spack.pkg.builtin.my_pkg ...` to relative imports `from ..my_pkg.package ...`
Users who have a repo on top of builtin should change imports from
```python
from spack.pkg.builtin.my_pkg import MyPkg
```
to
```python
from spack_repo.builtin.packages.my_pkg.package import MyPkg
```
and can configure their editors with
```
PYTHONPATH=$spack/lib/spack:$spack/var/spack/repos
```
[skip-verify-checksums]
This implements Package API v2.0, and is an opt-in feature for repos. It can be enabled with
```yaml
repo:
...
api: v2.0
```
It differs from the current default v1.0 as follows:
1. Package names can only contain `-` as a separator.
2. Package names can only be lowercase.
3. Package directory names are valid Python module names.
4. The repo namespace and its directory name are the same.
5. The `packages` subdir, which is configurable, should be a directory
name that is also a valid Python module name.
6. There is a one to one mapping between Spack package names and Python
module names.
7. Import statements `import spack.pkg.namespace.package_module` in
`package.py` files need to specify the canonical package module.
To go from Spack package name to Python module name:
- Replace `-` by `_`
- Add a leading `_` if the package name starts with a digit
To go from Python module name to Spack package name:
- Strip leading `_`
- Replace `_` by `-`.
link dependencies. Use the new method for hipblas.
[petsc] Add new variant, fortran-bindings, which is propagated to the
petsc configuration via the option with the same name.
[magma] Add new versions for the rocm-core dependency
[spectrum-mpi] Do not query languages that are not used by a dependent package
[sundials] Fix llvm-amdgpu's C compiler: clang -> amdclang
Pulls in the patch from https://github.com/pytorch/pytorch/pull/145849 to fix the following error:
CMake Error at cmake/Modules/FindBLAS.cmake:85 (check_function_exists):
Unknown CMake command "check_function_exists".
