add hip-lang as a language virtual

etc/spack/defaults/packages.yaml

@@ -33,6 +33,7 @@ packages:
       glu: [mesa-glu, openglu]
       golang: [go, gcc]
       go-or-gccgo-bootstrap: [go-bootstrap, gcc]
+      hip-lang: [llvm-amdgpu]
       iconv: [libiconv]
       ipp: [intel-oneapi-ipp]
       java: [openjdk, jdk]

lib/spack/spack/solver/concretize.lp

@@ -1421,6 +1421,7 @@ compiler(Compiler) :- compiler_supports_target(Compiler, _, _).
 language("c").
 language("cxx").
 language("fortran").
+language("hip-lang").
 language_runtime("fortran-rt").
 
 error(10, "Only external, or concrete, compilers are allowed for the {0} language", Language)

var/spack/repos/builtin/packages/llvm-amdgpu/package.py

@@ -59,6 +59,7 @@ class LlvmAmdgpu(CMakePackage, LlvmDetection, CompilerPackage):
         version("5.3.0", sha256="4e3fcddb5b8ea8dcaa4417e0e31a9c2bbdc9e7d4ac3401635a636df32905c93e")
 
     provides("c", "cxx")
+    provides("hip-lang")
     provides("fortran")
 
     variant(
@@ -372,3 +373,20 @@ def _cxx_path(self):
 
     def _fortran_path(self):
         return os.path.join(self.spec.prefix.bin, "amdflang")
+
+    @classmethod
+    def runtime_constraints(cls, *, spec, pkg):
+        """Callback function to inject runtime-related rules into the solver.
+
+        Rule-injection is obtained through method calls of the ``pkg`` argument.
+
+        Args:
+            spec: spec that will inject runtime dependencies
+            pkg: object used to forward information to the solver
+        """
+        pkg("*").depends_on(
+            "hip +rocm",
+            when="%[virtuals=hip-lang] llvm-amdgpu",
+            type="link",
+            description="If any package uses %llvm-amdgpu for hip-lang, it depends on hip",
+        )