From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Thu, 27 Dec 2018 15:38:57 +0000 (-0700)
Subject: Clear the previously determined TBB version if we need to revert to the bundled one.
X-Git-Tag: v9.1.0-rc1~478^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8df8f4a735698c6c5bd0e29f29649fabe9b5384f;p=dealii.git

Clear the previously determined TBB version if we need to revert to the bundled one.
---

diff --git a/cmake/configure/configure_1_threads.cmake b/cmake/configure/configure_1_threads.cmake
index 7cfe00dd43..6130e2e0b2 100644
--- a/cmake/configure/configure_1_threads.cmake
+++ b/cmake/configure/configure_1_threads.cmake
@@ -146,6 +146,11 @@ MACRO(FEATURE_THREADS_FIND_EXTERNAL var)
   # versions:
   #
   IF(TBB_VERSION VERSION_LESS "4.2")
+    # Clear the previously determined version numbers to avoid confusion
+    SET(TBB_VERSION "bundled")
+    SET(TBB_VERSION_MAJOR "")
+    SET(TBB_VERSION_MINOR "")
+
     MESSAGE(STATUS
       "The externally provided TBB library is older than version 4.2.0, which "
       "cannot be used with deal.II."