https://github.com/oneapi-src/oneTBB/pull/609
https://github.com/oneapi-src/oneTBB/issues/370
https://bugs.gentoo.org/842762

From 542a27fa1cfafaf76772e793549d9f4d288d03a9 Mon Sep 17 00:00:00 2001
From: Ilya Isaev <ilya.isaev@intel.com>
Date: Fri, 8 Oct 2021 10:18:16 +0300
Subject: [PATCH] Detect 32 bit x86 systems while adding -mwaitpkg option

Signed-off-by: Ilya Isaev <ilya.isaev@intel.com>
--- a/cmake/compilers/Clang.cmake
+++ b/cmake/compilers/Clang.cmake
@@ -44,7 +44,7 @@ if (NOT TBB_STRICT AND COMMAND tbb_remove_compile_flag)
 endif()
 
 # Enable Intel(R) Transactional Synchronization Extensions (-mrtm) and WAITPKG instructions support (-mwaitpkg) on relevant processors
-if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64)")
+if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64|i.86)")
     set(TBB_COMMON_COMPILE_FLAGS ${TBB_COMMON_COMPILE_FLAGS} -mrtm $<$<NOT:$<VERSION_LESS:${CMAKE_CXX_COMPILER_VERSION},12.0>>:-mwaitpkg>)
 endif()
 
--- a/cmake/compilers/GNU.cmake
+++ b/cmake/compilers/GNU.cmake
@@ -36,7 +36,7 @@ if (NOT CMAKE_GENERATOR MATCHES "Ninja" AND NOT CMAKE_CXX_DEPENDS_USE_COMPILER)
 endif()
 
 # Enable Intel(R) Transactional Synchronization Extensions (-mrtm) and WAITPKG instructions support (-mwaitpkg) on relevant processors
-if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64)")
+if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64|i.86)")
     set(TBB_COMMON_COMPILE_FLAGS ${TBB_COMMON_COMPILE_FLAGS} -mrtm $<$<AND:$<NOT:$<CXX_COMPILER_ID:Intel>>,$<NOT:$<VERSION_LESS:${CMAKE_CXX_COMPILER_VERSION},11.0>>>:-mwaitpkg>)
 endif()
 
--- a/cmake/compilers/MSVC.cmake
+++ b/cmake/compilers/MSVC.cmake
@@ -72,7 +72,7 @@ if (TBB_WINDOWS_DRIVER)
 endif()
 
 if (CMAKE_CXX_COMPILER_ID MATCHES "(Clang|IntelLLVM)")
-    if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64)")
+    if (CMAKE_SYSTEM_PROCESSOR MATCHES "(x86|AMD64|i.86)")
         set(TBB_COMMON_COMPILE_FLAGS ${TBB_COMMON_COMPILE_FLAGS} -mrtm -mwaitpkg)
     endif()
     set(TBB_OPENMP_NO_LINK_FLAG TRUE)