Add has_oneapi()

Author: michel2323

src/environment.jl

@@ -374,6 +374,25 @@ function has_rocm()
     end
 end
 
+"""
+    MPI.has_oneapi()
+
+Check if the MPI implementation is known to have oneAPI support.
+
+This can be overridden by setting the `JULIA_MPI_HAS_ONEAPI` environment variable to `true`
+or `false`.
+
+See also [`MPI.has_cuda`](@ref) and [`MPI.has_rocm`](@ref) for CUDA and ROCm support.
+"""
+function has_oneapi()
+    flag = get(ENV, "JULIA_MPI_HAS_ONEAPI", nothing)
+    if flag === nothing
+        return false
+    else
+        return parse(Bool, flag)
+    end
+end
+
 """
     MPI.has_gpu()