use feature test for <execution>

This commit is contained in:
Mathis Logemann 2020-11-21 15:41:03 +01:00
parent 096befe69e
commit 3eb00b9794

View file

@ -54,7 +54,7 @@ MAPNIK_DISABLE_WARNING_POP
#include <sstream>
#include <algorithm>
#if __cplusplus >= 201703L
#if __cpp_lib_execution >= 201603
#include <execution>
#endif