From fd22d109a675aa7095b05500f2add2378cda5913 Mon Sep 17 00:00:00 2001
From: eugeneswalker <38933153+eugeneswalker@users.noreply.github.com>
Date: Sat, 4 Nov 2023 06:55:19 -0700
Subject: [PATCH] sundials +sycl: add cxxflags=-fsycl via flag_handler (#40845)

---
 .../gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml     | 2 +-
 var/spack/repos/builtin/packages/sundials/package.py        | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
index efbf0e2e9c..8c872240f9 100644
--- a/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
+++ b/share/spack/gitlab/cloud_pipelines/stacks/e4s-oneapi/spack.yaml
@@ -200,11 +200,11 @@ spack:
   - kokkos +sycl +openmp cxxstd=17 +tests +examples
   - kokkos-kernels build_type=Release %oneapi ^kokkos +sycl +openmp cxxstd=17 +tests +examples
   - slate +sycl
+  - sundials +sycl cxxstd=17 +examples-install
   - tau +mpi +opencl +level_zero ~pdt +syscall   # tau: requires libdrm.so to be installed
   # --
   # - ginkgo +oneapi                    # InstallError: Ginkgo's oneAPI backend requires theDPC++ compiler as main CXX compiler.
   # - hpctoolkit +level_zero            # dyninst@12.3.0%gcc: /usr/bin/ld: libiberty/./d-demangle.c:142: undefined reference to `_intel_fast_memcpy'; can't mix intel-tbb@%oneapi with dyninst%gcc
-  # - sundials +sycl cxxstd=17          # sundials: include/sunmemory/sunmemory_sycl.h:20:10: fatal error: 'CL/sycl.hpp' file not found
 
   - py-scipy
 
diff --git a/var/spack/repos/builtin/packages/sundials/package.py b/var/spack/repos/builtin/packages/sundials/package.py
index f424a523f1..71ae9186a0 100644
--- a/var/spack/repos/builtin/packages/sundials/package.py
+++ b/var/spack/repos/builtin/packages/sundials/package.py
@@ -292,6 +292,12 @@ class Sundials(CMakePackage, CudaPackage, ROCmPackage):
     # fix issues with exported PETSc target(s) in SUNDIALSConfig.cmake
     patch("sundials-v5.8.0.patch", when="@5.8.0")
 
+    def flag_handler(self, name, flags):
+        if name == "cxxflags":
+            if self.spec.satisfies("+sycl"):
+                flags.append("-fsycl")
+        return (flags, None, None)
+
     # ==========================================================================
     # SUNDIALS Settings
     # ==========================================================================