checksum: fix circular imports on macOS (#45187)

lib/spack/spack/compiler.py

@@ -18,7 +18,6 @@
 import llnl.util.tty as tty
 from llnl.util.filesystem import path_contains_subdirectory, paths_containing_libs
 
-import spack.compilers
 import spack.error
 import spack.schema.environment
 import spack.spec

lib/spack/spack/compilers/__init__.py

@@ -488,7 +488,7 @@ def supported_compilers_for_host_platform() -> List[str]:
     return supported_compilers_for_platform(host_plat)
 
 
-def supported_compilers_for_platform(platform: spack.platforms.Platform) -> List[str]:
+def supported_compilers_for_platform(platform: "spack.platforms.Platform") -> List[str]:
     """Return a set of compiler class objects supported by Spack
     that are also supported by the provided platform
 

lib/spack/spack/config.py

@@ -39,7 +39,6 @@
 
 from llnl.util import filesystem, lang, tty
 
-import spack.compilers
 import spack.paths
 import spack.platforms
 import spack.schema

lib/spack/spack/repo.py

@@ -590,7 +590,7 @@ def __init__(
         self,
         package_checker: FastPackageChecker,
         namespace: str,
-        cache: spack.caches.FileCacheType,
+        cache: "spack.caches.FileCacheType",
     ):
         self.checker = package_checker
         self.packages_path = self.checker.packages_path
@@ -683,7 +683,7 @@ class RepoPath:
     def __init__(
         self,
         *repos: Union[str, "Repo"],
-        cache: spack.caches.FileCacheType,
+        cache: "spack.caches.FileCacheType",
         overrides: Optional[Dict[str, Any]] = None,
     ) -> None:
         self.repos: List[Repo] = []
@@ -950,7 +950,7 @@ def __init__(
         self,
         root: str,
         *,
-        cache: spack.caches.FileCacheType,
+        cache: "spack.caches.FileCacheType",
         overrides: Optional[Dict[str, Any]] = None,
     ) -> None:
         """Instantiate a package repository from a filesystem path.