Fix build on systems without ucontext.h in libc (#1055)

* Enable thread based resumable tasks if ucontext is absent

Signed-off-by: pavelkumbrasev <pavel.kumbrasev@intel.com>
Co-authored-by: Ilya Isaev <ilya.isaev@intel.com>

cmake/resumable_tasks.cmake

@@ -0,0 +1,23 @@
+# Copyright (c) 2023 Intel Corporation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+include(CheckSymbolExists)
+
+if (UNIX)
+    check_symbol_exists("getcontext" "ucontext.h" _tbb_have_ucontext)
+    if (NOT _tbb_have_ucontext)
+        set(TBB_RESUMABLE_TASKS_USE_THREADS "__TBB_RESUMABLE_TASKS_USE_THREADS=1")
+    endif()
+    unset(_tbb_have_ucontext)
+endif()

src/tbb/CMakeLists.txt

@@ -56,6 +56,7 @@ target_compile_definitions(tbb
                            $<$<CONFIG:DEBUG>:TBB_USE_DEBUG>
                            PRIVATE
                            __TBB_BUILD
+                           ${TBB_RESUMABLE_TASKS_USE_THREADS}
                            $<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:__TBB_DYNAMIC_LOAD_ENABLED=0>
                            $<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:__TBB_SOURCE_DIRECTLY_INCLUDED=1>)