Introduce offload variant for llvm >= 19. (#45865)

1 files changed, 7 insertions, 0 deletions

diff --git a/var/spack/repos/builtin/packages/llvm/package.py b/var/spack/repos/builtin/packages/llvm/package.py
index cc75f8019a..72a4d30d29 100644
--- a/var/spack/repos/builtin/packages/llvm/package.py
+++ b/var/spack/repos/builtin/packages/llvm/package.py
@@ -165,8 +165,12 @@ class Llvm(CMakePackage, CudaPackage, LlvmDetection, CompilerPackage):
         "or as a project (with the compiler in use)",
     )
 
+    variant("offload", default=True, when="@19:", description="Build the Offload subproject")
+    conflicts("+offload", when="~clang")
+
     variant("libomptarget", default=True, description="Build the OpenMP offloading library")
     conflicts("+libomptarget", when="~clang")
+    conflicts("+libomptarget", when="~offload @19:")
     for _p in ["darwin", "windows"]:
         conflicts("+libomptarget", when="platform={0}".format(_p))
     del _p
@@ -912,6 +916,9 @@ class Llvm(CMakePackage, CudaPackage, LlvmDetection, CompilerPackage):
             elif "openmp=project" in spec:
                 projects.append("openmp")
 
+            if "+offload" in spec:
+                runtimes.append("offload")
+
             if "+libomptarget" in spec:
                 cmake_args.append(define("OPENMP_ENABLE_LIBOMPTARGET", True))
             else: