From 3e505d94d9c83445f794cbe405e2d219ea0c3b6a Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Tue, 16 Nov 2021 12:49:45 -0600
Subject: [PATCH] CMake: Export whether we have encountered the ONEAPI TBB
 layout

---
 cmake/configure/configure_1_tbb.cmake | 4 ++++
 cmake/modules/FindTBB.cmake           | 4 ++++
 include/deal.II/base/config.h.in      | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/cmake/configure/configure_1_tbb.cmake b/cmake/configure/configure_1_tbb.cmake
index 9626f9d81d..73ff6645b5 100644
--- a/cmake/configure/configure_1_tbb.cmake
+++ b/cmake/configure/configure_1_tbb.cmake
@@ -25,6 +25,8 @@ MACRO(FEATURE_TBB_FIND_EXTERNAL var)
     SET(${var} TRUE)
   ENDIF()
 
+  SET(DEAL_II_TBB_WITH_ONEAPI ${TBB_WITH_ONEAPI})
+
   #
   # TBB currently uses the version numbering scheme
   #
@@ -75,6 +77,8 @@ MACRO(FEATURE_TBB_CONFIGURE_BUNDLED)
   LIST(APPEND TBB_LIBRARIES ${CMAKE_DL_LIBS})
 
   LIST(APPEND TBB_BUNDLED_INCLUDE_DIRS ${TBB_FOLDER}/include)
+
+  SET(DEAL_II_TBB_WITH_ONEAPI FALSE)
 ENDMACRO()
 
 
diff --git a/cmake/modules/FindTBB.cmake b/cmake/modules/FindTBB.cmake
index 43ceafbb1a..a92ade7f86 100644
--- a/cmake/modules/FindTBB.cmake
+++ b/cmake/modules/FindTBB.cmake
@@ -21,6 +21,7 @@
 #   TBB_LIBRARIES
 #   TBB_INCLUDE_DIRS
 #   TBB_WITH_DEBUGLIB
+#   TBB_WITH_ONEAPI
 #   TBB_VERSION
 #   TBB_VERSION_MAJOR
 #   TBB_VERSION_MINOR
@@ -81,6 +82,7 @@ IF(EXISTS ${TBB_INCLUDE_DIR}/tbb/tbb_stddef.h)
     "${TBB_VERSION_MAJOR}.${TBB_VERSION_MINOR}"
     )
 
+  SET(TBB_WITH_ONEAPI FALSE)
 ELSE()
 
   #
@@ -108,6 +110,8 @@ ELSE()
       "${TBB_VERSION_MAJOR}.${TBB_VERSION_MINOR}"
       )
   ENDIF()
+
+  SET(TBB_WITH_ONEAPI TRUE)
 ENDIF()
 
 DEAL_II_PACKAGE_HANDLE(TBB
diff --git a/include/deal.II/base/config.h.in b/include/deal.II/base/config.h.in
index 4c549dff74..89e2dc3552 100644
--- a/include/deal.II/base/config.h.in
+++ b/include/deal.II/base/config.h.in
@@ -73,6 +73,9 @@
 #define DEAL_II_WITH_THREADS
 
 #define TBB_SUPPRESS_DEPRECATED_MESSAGES 1
+
+#cmakedefine DEAL_II_TBB_WITH_ONEAPI
+
 #endif
 
 /***********************************************************************
-- 
2.39.5