Don't mandate C++14 as some build daemons still don't have it

[simgrid.git] / CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 945f9ef..94a78f4 100644 (file)
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -412,9 +412,6 @@ if (enable_model-checking AND enable_ns3)
 endif()
 
 get_property(known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
-if (enable_model-checking AND (NOT ("cxx_std_14" IN_LIST known_features)))
-  message(FATAL_ERROR "Model-checking requires C++14. Please upgrade your compiler")
-endif()
 
 if(enable_smpi)
   SET(HAVE_SMPI 1)
@@ -778,6 +775,14 @@ if(enable_java)
   include(${CMAKE_HOME_DIRECTORY}/tools/cmake/Java.cmake)
 endif()
 
+if (enable_model-checking AND (NOT ("cxx_std_14" IN_LIST known_features)))
+  message(WARNING "C++14 not found. The model-checker will use a slow hash function. You should upgrade your compiler")
+  set(SG_HAVE_CPP14 0)
+else()
+  set(SG_HAVE_CPP14 1)
+  set_property(TARGET simgrid PROPERTY CXX_STANDARD 14)    
+endif()
+
 # Python binding (with pybind11)
 ################
 # Our usage of pybind11::overload_cast mandates C++14