Disable mimalloc by default for DPC++

CMakeLists.txt

@@ -21,7 +21,6 @@ else()
   set(ENABLE_ACC_CHECK OFF)
 endif()
 
-option(CELERITY_USE_MIMALLOC "Use the mimalloc memory allocator" ON)
 option(CELERITY_ACCESSOR_BOUNDARY_CHECK "Enable accessor boundary check" ${ENABLE_ACC_CHECK})
 
 if(CELERITY_ACCESSOR_BOUNDARY_CHECK)
@@ -119,6 +118,15 @@ if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE "Release" CACHE STRING "CMake Build Type" FORCE)
 endif()
 
+if(CELERITY_SYCL_IMPL STREQUAL "DPC++")
+  # See https://github.com/oneapi-src/unified-runtime/issues/803
+  message(STATUS "Not enabling mimalloc by default because it breaks with oneAPI plugin loading")
+  set(CELERITY_USE_MIMALLOC_DEFAULT OFF)
+else()
+  set(CELERITY_USE_MIMALLOC_DEFAULT ON)
+endif()
+option(CELERITY_USE_MIMALLOC "Use the mimalloc memory allocator" ${CELERITY_USE_MIMALLOC_DEFAULT})
+
 # 3rdparty dependencies
 include(FetchContent)
 

cmake/celerity-config.cmake.in

@@ -23,7 +23,9 @@ find_dependency(fmt REQUIRED)
 find_dependency(spdlog REQUIRED)
 find_dependency(small_vector REQUIRED)
 find_dependency(libenvpp REQUIRED)
-find_dependency(mimalloc REQUIRED)
+if(@CELERITY_USE_MIMALLOC@)
+  find_dependency(mimalloc REQUIRED)
+endif()
 if(@CELERITY_ENABLE_CUDA_BACKEND@)
   if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.17")
     find_dependency(CUDAToolkit REQUIRED)