Use GCC OpenMP with source-built Intel SYCL

Author: allnes

scripts/ci/sycl_x86_setup.py

@@ -282,6 +282,15 @@ def setup_unix_compilers(sycl_root: Path) -> None:
             openmp_library = find_file([sycl_root, Path("/opt/intel/oneapi")], "libomp.so")
             openmp_library_name = "omp"
             openmp_flags = "-fopenmp"
+        if openmp_library is None and source_built_linux_toolchain:
+            gcc_root = Path(require_env("ITLABAI_GCC_INSTALL_DIR"))
+            gcc_include_root = gcc_root / "include"
+            gcc_openmp_header = find_file([gcc_include_root], "omp.h")
+            gcc_openmp_library = Path(capture(["gcc-13", "-print-file-name=libgomp.so"]))
+            if gcc_openmp_header is not None and gcc_openmp_library.exists():
+                openmp_library = gcc_openmp_library
+                openmp_library_name = "gomp"
+                openmp_flags = "-fopenmp"
         if openmp_library is None and not source_built_linux_toolchain:
             main_error("Unable to locate an Intel toolchain OpenMP runtime library")
 
@@ -294,6 +303,9 @@ def setup_unix_compilers(sycl_root: Path) -> None:
             ],
             "omp.h",
         )
+        if openmp_header is None and source_built_linux_toolchain:
+            gcc_root = Path(require_env("ITLABAI_GCC_INSTALL_DIR"))
+            openmp_header = find_file([gcc_root / "include"], "omp.h")
         if openmp_header is None and not source_built_linux_toolchain:
             main_error(
                 "Unable to locate Intel-provided omp.h under the SYCL toolchain"