slepc: add HPDDM wrappers (#36118)

var/spack/repos/builtin/packages/petsc/package.py

@@ -13,7 +13,7 @@ class Petsc(Package, CudaPackage, ROCmPackage):
     differential equations.
     """
 
-    homepage = "https://www.mcs.anl.gov/petsc/index.html"
+    homepage = "https://petsc.org"
     url = "https://ftp.mcs.anl.gov/pub/petsc/release-snapshots/petsc-3.15.0.tar.gz"
     git = "https://gitlab.com/petsc/petsc.git"
     maintainers("balay", "barrysmith", "jedbrown")

var/spack/repos/builtin/packages/slepc/package.py

@@ -52,6 +52,7 @@ class Slepc(Package, CudaPackage, ROCmPackage):
 
     variant("arpack", default=True, description="Enables Arpack wrappers")
     variant("blopex", default=False, description="Enables BLOPEX wrappers")
+    variant("hpddm", default=False, description="Enables HPDDM wrappers")
 
     # NOTE: make sure PETSc and SLEPc use the same python.
     depends_on("python@2.6:2.8,3.4:", type="build")
@@ -79,6 +80,8 @@ class Slepc(Package, CudaPackage, ROCmPackage):
     # Arpack can not be used with 64bit integers.
     conflicts("+arpack", when="@:3.12 ^petsc+int64")
     conflicts("+blopex", when="^petsc+int64")
+    # HPDDM cannot be used in both PETSc and SLEPc prior to 3.19.0
+    conflicts("+hpddm", when="@:3.18 ^petsc+hpddm")
 
     resource(
         name="blopex",
@@ -147,6 +150,11 @@ def install(self, spec, prefix):
         if "+blopex" in spec:
             options.append("--download-blopex")
 
+        # For the moment, HPDDM does not work as a dependency
+        # using download instead
+        if "+hpddm" in spec:
+            options.append("--download-hpddm")
+
         python("configure", "--prefix=%s" % prefix, *options)
 
         make("V=1")