Windows build fixed

builds/msvc/c_local_lat/c_local_lat.vcproj

@@ -165,10 +165,6 @@
 			Filter="cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx"
 			UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"
 			>
-			<File
-				RelativePath="..\..\..\perf\helpers.cpp"
-				>
-			</File>
 			<File
 				RelativePath="..\..\..\perf\local_lat.cpp"
 				>

builds/msvc/c_local_thr/c_local_thr.vcproj

@@ -165,10 +165,6 @@
 			Filter="cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx"
 			UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"
 			>
-			<File
-				RelativePath="..\..\..\perf\helpers.cpp"
-				>
-			</File>
 			<File
 				RelativePath="..\..\..\perf\local_thr.cpp"
 				>

builds/msvc/c_remote_lat/c_remote_lat.vcproj

@@ -165,10 +165,6 @@
 			Filter="cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx"
 			UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"
 			>
-			<File
-				RelativePath="..\..\..\perf\helpers.cpp"
-				>
-			</File>
 			<File
 				RelativePath="..\..\..\perf\remote_lat.cpp"
 				>

builds/msvc/c_remote_thr/c_remote_thr.vcproj

@@ -165,10 +165,6 @@
 			Filter="cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx"
 			UniqueIdentifier="{4FC737F1-C7A5-4376-A066-2A32D752A2FF}"
 			>
-			<File
-				RelativePath="..\..\..\perf\helpers.cpp"
-				>
-			</File>
 			<File
 				RelativePath="..\..\..\perf\remote_thr.cpp"
 				>

include/zmq_utils.h

@@ -20,6 +20,10 @@
 #ifndef __ZMQ_UTILS_H_INCLUDED__
 #define __ZMQ_UTILS_H_INCLUDED__
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*  Win32 needs special handling for DLL exports                              */
 #if defined _WIN32
 #   if defined DLL_EXPORT
@@ -46,4 +50,8 @@ ZMQ_EXPORT void zmq_sleep (int seconds_);
 
 #undef ZMQ_EXPORT
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/zmq.cpp

@@ -18,6 +18,7 @@
 */
 
 #include "../include/zmq.h"
+#include "../include/zmq_utils.h"
 
 #include <string.h>
 #include <errno.h>