rocm conflicts with compilers that do not support rocm

lib/spack/spack/build_systems/cached_cmake.py

@@ -139,11 +139,6 @@ def initconfig_compiler_entries(self):
             "endif()\n",
         ]
 
-        # We defined hipcc as top-level compiler for packages when +rocm.
-        # This avoid problems coming from rocm flags being applied to another compiler.
-        if "+rocm" in spec:
-            entries.insert(0, cmake_cache_path("CMAKE_CXX_COMPILER", self.spec["hip"].hipcc))
-
         flags = spec.compiler_flags
 
         # use global spack compiler flags

lib/spack/spack/build_systems/rocm.py

@@ -145,7 +145,11 @@ class ROCmPackage(PackageBase):
     depends_on("hip +rocm", when="+rocm")
 
     # need amd gpu type for rocm builds
+    compilers_supporting_rocm = ("cce", "rocmcc")
     conflicts("amdgpu_target=none", when="+rocm")
+    for compiler in spack.compilers.supported_compilers():
+        if compiler not in compilers_supporting_rocm:
+            conflicts(f"%{compiler}", when="+rocm")
 
     # https://github.com/ROCm-Developer-Tools/HIP/blob/master/bin/hipcc
     # It seems that hip-clang does not (yet?) accept this flag, in which case