From: Matthias Maier <tamiko@43-1.org>
Date: Mon, 7 Sep 2015 21:04:01 +0000 (-0500)
Subject: CMake: Bugfix: Export -pthread when trying to link
X-Git-Tag: v8.4.0-rc2~465^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F1545%2Fhead;p=dealii.git

CMake: Bugfix: Export -pthread when trying to link

It turns out that clang is a bit more picky and wants to have -pthread
on the command line.
---

diff --git a/cmake/checks/check_01_cxx_features.cmake b/cmake/checks/check_01_cxx_features.cmake
index f8775c5c23..3e39aed620 100644
--- a/cmake/checks/check_01_cxx_features.cmake
+++ b/cmake/checks/check_01_cxx_features.cmake
@@ -217,6 +217,7 @@ IF(NOT DEFINED DEAL_II_WITH_CXX11 OR DEAL_II_WITH_CXX11)
       "
       DEAL_II_HAVE_CXX11_SHARED_PTR)
 
+    PUSH_CMAKE_REQUIRED("-pthread")
     CHECK_CXX_SOURCE_COMPILES(
       "
       #include <thread>
@@ -224,6 +225,8 @@ IF(NOT DEFINED DEAL_II_WITH_CXX11 OR DEAL_II_WITH_CXX11)
       int main(){ std::thread t(f,1); t.join(); return 0; }
       "
       DEAL_II_HAVE_CXX11_THREAD)
+    RESET_CMAKE_REQUIRED()
+    PUSH_CMAKE_REQUIRED("${DEAL_II_CXX_VERSION_FLAG}")
 
     CHECK_CXX_SOURCE_COMPILES(
       "