Windows compatibility

Author: franzpoeschel

CMakeLists.txt

@@ -421,6 +421,11 @@ target_include_directories(openPMD PUBLIC
     $<INSTALL_INTERFACE:include>
 )
 
+# Winsock library for gethostname() function on Windows
+if(WIN32)
+    target_link_libraries(openPMD PRIVATE ws2_32)
+endif()
+
 # C++11 std::variant (C++17 stdlib preview)
 # TODO not needed with C++17 compiler
 add_library(openPMD::thirdparty::mpark_variant INTERFACE IMPORTED)

src/ChunkInfo.cpp

@@ -26,9 +26,14 @@
 #include <iostream>
 #include <list>
 #include <map>
-#include <unistd.h>
 #include <utility>
 
+#ifdef _WIN32
+#include <windows.h>
+#else
+#include <unistd.h>
+#endif
+
 namespace openPMD
 {
 ChunkInfo::ChunkInfo( Offset offset_in, Extent extent_in )
@@ -569,7 +574,10 @@ chunk_assignment::RankMeta byMethodCollective( MPI_Comm comm, Method method )
 std::string hostname()
 {
     char hostname[ MAX_HOSTNAME_LENGTH ];
-    gethostname( hostname, MAX_HOSTNAME_LENGTH );
+    if( gethostname( hostname, MAX_HOSTNAME_LENGTH ) )
+    {
+        throw std::runtime_error( "[gethostname] Could not inquire hostname." );
+    }
     std::string res( hostname );
     return res;
 }