From: Marc Fehling <marc.fehling@gmx.net>
Date: Sat, 30 Nov 2019 23:51:16 +0000 (+0100)
Subject: Fixed cmake 3.16.0 incompatibility.
X-Git-Tag: v9.2.0-rc1~823^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F9117%2Fhead;p=dealii.git

Fixed cmake 3.16.0 incompatibility.
---

diff --git a/cmake/configure/configure_1_threads.cmake b/cmake/configure/configure_1_threads.cmake
index b4de2cc2cc..b039497a13 100644
--- a/cmake/configure/configure_1_threads.cmake
+++ b/cmake/configure/configure_1_threads.cmake
@@ -38,6 +38,16 @@ MACRO(SETUP_THREADING)
 
     RESET_CMAKE_REQUIRED()
 
+    #
+    # The FindThreads macro returned a linker option instead of the actual
+    # library name in earlier versions. We still require the linker option,
+    # so we fix the corresponding variable.
+    #  - See: https://gitlab.kitware.com/cmake/cmake/issues/19747
+    #
+    IF(CMAKE_THREAD_LIBS_INIT AND NOT "${CMAKE_THREAD_LIBS_INIT}" MATCHES "^-l")
+      STRING(PREPEND CMAKE_THREAD_LIBS_INIT "-l")
+    ENDIF()
+
   ELSE()
 
     #