Add all patches needed for building DPCPP across platforms with in-flight fixes.

There are some in-flight work that resolves issues, include some cross platform
work. These patches allow us to test with the latest changes whilst there is work
ongoing.

Author: coldav

.github/actions/do_build_dpcpp/action.yml

@@ -28,6 +28,16 @@ runs:
         repository: intel/llvm
         path: llvm
 
+    - name: apply patches
+      if: contains(inputs.download_dpcpp_artefact, inputs.target) != true    
+      shell: bash
+      run: |
+        cd llvm
+        git apply $GITHUB_WORKSPACE/.github/patches/DPCPP-0001-Fix-static_assert-with-funsigned-char.patch
+        git apply $GITHUB_WORKSPACE/.github/patches/DPCPP-0002-SYCL-NativeCPU-Build-libclc-target-independently.patch
+        git apply $GITHUB_WORKSPACE/.github/patches/DPCPP-0003-add-cl_khr_int64_extended_atomics.patch
+        git apply $GITHUB_WORKSPACE/.github/patches/DPCPP-0004-SYCL-NativeCPU-Fix-__clc_exp10.patch
+
     - name: dpcpp configure
       if: contains(inputs.download_dpcpp_artefact, inputs.target) != true
       shell: bash

.github/actions/run_opencl_cts/action.yml

@@ -36,12 +36,9 @@ runs:
         set -x
         # Build override file, all is done first, then the target specific.
         # The last file can overwrite previous overrides.
-        for csv in .github/opencl_cts/override_all.csv .github/opencl_cts/override_${{ inputs.target }}.csv
-        do
-           [ -f $csv ] && cat $csv
-        done > override.csv
-        echo override file:
-        cat override.csv
+        python3 .github/scripts/create_overload_csv.py -d .github/opencl_cts/ \
+             -k ${{ inputs.target }} \
+             -o override_combined.csv -v        
 
         # $CTS_FILTER ignores certain test, so is treated differently to temporary fails.
         # Note: use 'eval' built-in to handle quoting/escaping/splitting reqs
@@ -55,5 +52,5 @@ runs:
           -e CL_PLATFORM_INDEX=0 \
           -s $GITHUB_WORKSPACE/test_conformance/$CTS_CSV_FILE \
           -i $GITHUB_WORKSPACE/source/cl/scripts/$CTS_FILTER \
-          -o override.csv"
+          -o override_combined.csv"
         eval $RUN_CITIES

.github/actions/run_sycl_cts/action.yml

@@ -69,14 +69,10 @@ runs:
 
         # $CTS_FILTER ignores certain test, so is treated differently to temporary fails.
 
-        # Build override file, all is done first, then the target specific. The last file can overwrite prevous overrides.
-        for csv in .github/sycl_cts/override_all.csv .github/sycl_cts/override_${{ inputs.target }}.csv
-        do
-           [ -f $csv ] && cat $csv
-        done > override.csv
-
-        echo OVERRIDE FILE:
-        cat override.csv
+        # Build override file, all is done first, then the target specific. The last file can overwrite previous overrides.
+        python3 .github/scripts/create_overload_csv.py -d .github/sycl_cts/ \
+             -k opencl ${{ inputs.target }} \
+             -o override_combined.csv -v                
 
         exitcode=0
         set -x
@@ -92,7 +88,7 @@ runs:
           -l SYCL-CTS/cts.log -f SYCL-CTS/cts.fail \
           -r SYCL-CTS/cts.xml \
           -v \
-          -o override.csv \
+          -o override_combined.csv \
           $SYCL_CTS_FILTER || exitcode=$?
 
         export OCL_ICD_FILENAMES=$GITHUB_WORKSPACE/install_ock/lib/libCL.so

.github/patches/DPCPP-0001-Fix-static_assert-with-funsigned-char.patch

@@ -0,0 +1,31 @@
+From c84bf4651cbcbe743ba7f043560b0cd210a66347 Mon Sep 17 00:00:00 2001
+From: Harald van Dijk <[email protected]>
+Date: Mon, 24 Feb 2025 10:43:38 +0000
+Subject: [PATCH] Fix static_assert with -funsigned-char
+
+The type of (ext_vector<int8_t, 2>{1, 0} == 0)[1] has type char, not
+int8_t, and therefore depending on whether -funsigned-char is in effect
+may either have the value -1 or have the value 255. Cast to int8_t to
+ensure it always gets taken as signed. This is only needed for the
+static_assert: the rest of the code already works for signed and
+unsigned plain char alike.
+---
+ sycl/include/sycl/detail/vector_arith.hpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/sycl/include/sycl/detail/vector_arith.hpp b/sycl/include/sycl/detail/vector_arith.hpp
+index aad90aa83379..ab374c06e4bd 100644
+--- a/sycl/include/sycl/detail/vector_arith.hpp
++++ b/sycl/include/sycl/detail/vector_arith.hpp
+@@ -265,7 +265,7 @@ template <typename Self> struct VecOperators {
+           // ensure we generate 0/1 only (and not 2/-1/etc.).
+ #if __clang_major__ >= 20
+           // Not an integral constant expression prior to clang-20.
+-          static_assert((ext_vector<int8_t, 2>{1, 0} == 0)[1] == -1);
++          static_assert(int8_t((ext_vector<int8_t, 2>{1, 0} == 0)[1]) == -1);
+ #endif
+ 
+           tmp = reinterpret_cast<decltype(tmp)>((tmp != 0) * -1);
+-- 
+2.45.2
+