alpgen: point url to archive.org and deprecate

Allows user to define an alternative name for `mpic++` in `packages:openmpi:package_attributes:cxxname`.

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

@@ -12,12 +12,17 @@ class Alpgen(CMakePackage, MakefilePackage):
     in hadronic collisions.
     """
 
-    homepage = "http://mlm.home.cern.ch/mlm/alpgen/"
-    url = "http://mlm.home.cern.ch/mlm/alpgen/V2.1/v214.tgz"
+    homepage = "https://web.archive.org/web/20171017025050/http://mlm.home.cern.ch/mlm/alpgen/"
+    url = "https://web.archive.org/web/20171017025050/http://mlm.home.cern.ch/mlm/alpgen/V2.1/v214.tgz"
 
     tags = ["hep"]
 
-    version("2.1.4", sha256="2f43f7f526793fe5f81a3a3e1adeffe21b653a7f5851efc599ed69ea13985c5e")
+    # Deprecated since not available outside of archive.org
+    version(
+        "2.1.4",
+        sha256="2f43f7f526793fe5f81a3a3e1adeffe21b653a7f5851efc599ed69ea13985c5e",
+        deprecated=True,
+    )
 
     build_system("makefile", "cmake", default="makefile")
 

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

@@ -32,6 +32,7 @@ class Openmpi(AutotoolsPackage, CudaPackage):
     url = "https://download.open-mpi.org/release/open-mpi/v4.1/openmpi-4.1.0.tar.bz2"
     list_url = "https://www.open-mpi.org/software/ompi/"
     git = "https://github.com/open-mpi/ompi.git"
+    cxxname = "mpic++"
 
     maintainers("hppritcha", "naughtont3")
 
@@ -885,7 +886,7 @@ def setup_run_environment(self, env):
         # Because MPI is both a runtime and a compiler, we have to setup the
         # compiler components as part of the run environment.
         env.set("MPICC", join_path(self.prefix.bin, "mpicc"))
-        env.set("MPICXX", join_path(self.prefix.bin, "mpic++"))
+        env.set("MPICXX", join_path(self.prefix.bin, self.cxxname))
         env.set("MPIF77", join_path(self.prefix.bin, "mpif77"))
         env.set("MPIF90", join_path(self.prefix.bin, "mpif90"))
         # Open MPI also has had mpifort since v1.7, so we can set MPIFC to that
@@ -927,7 +928,7 @@ def setup_dependent_build_environment(self, env, dependent_spec):
 
     def setup_dependent_package(self, module, dependent_spec):
         self.spec.mpicc = join_path(self.prefix.bin, "mpicc")
-        self.spec.mpicxx = join_path(self.prefix.bin, "mpic++")
+        self.spec.mpicxx = join_path(self.prefix.bin, self.cxxname)
         self.spec.mpifc = join_path(self.prefix.bin, "mpif90")
         self.spec.mpif77 = join_path(self.prefix.bin, "mpif77")