Allow for packages with multiple build-systems (#30738)

This commit extends the DSL that can be used in packages
to allow declaring that a package uses different build-systems
under different conditions.

It requires each spec to have a `build_system` single valued
variant. The variant can be used in many context to query, manipulate
or select the build system associated with a concrete spec.

The knowledge to build a package has been moved out of the
PackageBase hierarchy, into a new Builder hierarchy. Customization
of the default behavior for a given builder can be obtained by
coding a new derived builder in package.py.

The "run_after" and "run_before" decorators are now applied to
methods on the builder. They can also incorporate a "when="
argument to specify that a method is run only when certain
conditions apply.

For packages that do not define their own builder, forwarding logic
is added between the builder and package (methods not found in one
will be retrieved from the other); this PR is expected to be fully
backwards compatible with unmodified packages that use a single
build system.

1 files changed, 4 insertions, 5 deletions

diff --git a/var/spack/repos/builtin.mock/packages/dev-build-test-install/package.py b/var/spack/repos/builtin.mock/packages/dev-build-test-install/package.py
index 185fe5552c..ba0b1400a3 100644
--- a/var/spack/repos/builtin.mock/packages/dev-build-test-install/package.py
+++ b/var/spack/repos/builtin.mock/packages/dev-build-test-install/package.py
@@ -2,19 +2,15 @@
 # Spack Project Developers. See the top-level COPYRIGHT file for details.
 #
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
-
-
 from spack.package import *
 
 
-class DevBuildTestInstall(Package):
+class DevBuildTestInstall(MakefilePackage):
     homepage = "example.com"
     url = "fake.com"
 
     version("0.0.0", sha256="0123456789abcdef0123456789abcdef")
 
-    phases = ["edit", "install"]
-
     filename = "dev-build-test-file.txt"
     original_string = "This file should be edited"
     replacement_string = "This file has been edited"
@@ -26,5 +22,8 @@ class DevBuildTestInstall(Package):
             f.truncate()
             f.write(self.replacement_string)
 
+    def build(self, spec, prefix):
+        pass
+
     def install(self, spec, prefix):
         install(self.filename, prefix)