Drop support for ComputeCpp

Due to its, as of version 2.11, flaky support for USM, we cannot support ComputeCpp for the time being.
celerity · Mar 24, 2023 · 68367dd · 68367dd
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diff --git a/.github/workflows/build_matrix.json b/.github/workflows/build_matrix.json
@@ -1,14 +1,6 @@
 {
     "NOTE": "Make sure to keep this in sync with docs/platform-support.md. Also ensure that the 'ubuntu-version' between 'HEAD' and 'latest' builds remains the same.",
     "default": [
-        { "sycl": "computecpp", "sycl-version": "2.6.0", "ubuntu-version": "20.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.7.0", "ubuntu-version": "20.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.8.0", "ubuntu-version": "20.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.9.0", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.10.0", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.10.0", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Release" },
-        { "sycl": "computecpp", "sycl-version": "2.10.0-experimental", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Debug" },
-        { "sycl": "computecpp", "sycl-version": "2.10.0-experimental", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Release" },
         { "sycl": "dpcpp", "sycl-version": "3fd08509", "ubuntu-version": "20.04", "platform": "intel", "build-type": "Debug" },
         { "sycl": "dpcpp", "sycl-version": "latest", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Debug" },
         { "sycl": "dpcpp", "sycl-version": "latest", "ubuntu-version": "22.04", "platform": "intel", "build-type": "Release" },

diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -73,6 +73,8 @@ endif()
 
 set(CELERITY_DETAIL_IS_OLD_COMPUTECPP_COMPILER OFF)
 if(CELERITY_SYCL_IMPL STREQUAL "ComputeCpp")
+  message(FATAL "ComputeCpp is currently not supported.") # Comment out this error if you want to build against ComputeCpp anyway.
+
   # Determining the compiler version would usually be a job for FindComputeCpp, but since we're vendoring it, we try
   # to avoid introducing unnecessary changes.
   # TODO Replace this once FindComputeCpp supports distinguishing old and new ("experimental") compilers natively.

diff --git a/docs/platform-support.md b/docs/platform-support.md
@@ -13,13 +13,11 @@ The most recent version of Celerity aims to support the following environments:
   * CUDA ≥ 11.0
   * on NVIDIA hardware with compute capability ≥ 7.0
   * or on CPUs via OpenMP
-* ComputeCpp ≥ version 2.6.0
-  * on Intel hardware
-  * with [stable](https://developer.codeplay.com/products/computecpp/ce/download)
-    and [experimental](https://developer.codeplay.com/products/computecpp/ce/download?experimental=true) compilers
 * DPC++ ≥ revision [`3fd08509`](https://github.com/intel/llvm/commit/3fd08509)
   * on Intel hardware
 
+ComputeCpp is currently not supported.
+
 ## Continuously Tested Configurations
 
 We automatically verify Celerity's build process and test suites against a select number of system configurations.
@@ -28,9 +26,6 @@ Those are:
 
 | SYCL       | SYCL version                                                                   | OS           | Build type     |
 |------------|--------------------------------------------------------------------------------|--------------|----------------|
-| ComputeCpp | 2.6.0, 2.7.0, 2.8.0, 2.9.0 (stable)                                            | Ubuntu 20.04 | Debug          |
-| ComputeCpp | 2.10.0 (stable)                                                                | Ubuntu 22.04 | Debug, Release |
-| ComputeCpp | 2.10.0 (experimental compiler)                                                 | Ubuntu 22.04 | Debug, Release |
 | DPC++      | [`3fd08509`](https://github.com/intel/llvm/commit/3fd08509)                    | Ubuntu 20.04 | Debug          |
 | DPC++      | [`HEAD`](https://github.com/intel/llvm/)                                       | Ubuntu 22.04 | Debug, Release |
 | hipSYCL    | [`7b00e2ef`](https://github.com/illuhad/hipSYCL/commit/7b00e2ef) (CUDA 11.0.3) | Ubuntu 20.04 | Debug          |