use call prefix to load backends

xmrstak/backend/plugin.hpp

 #pragma once
 
 #include "xmrstak/misc/environment.hpp"
+#include "xmrstak/params.hpp"
 
 #include <thread>
 #include <atomic>
@@ -36,7 +37,7 @@ struct plugin
 			return;
 		}
 #else
-		libBackend = dlopen((std::string("./lib") + libName + ".so").c_str(), RTLD_LAZY);
+		libBackend = dlopen((params::inst().executablePrefix + "/lib" + libName + ".so").c_str(), RTLD_LAZY);
 		if(!libBackend)
 		{
 			std::cerr << "WARNING: "<< m_backendName <<" cannot load backend library: " << dlerror() << std::endl;

xmrstak/cli/cli-miner.cpp

@@ -60,7 +60,8 @@ void help()
 	using namespace std;
 	using namespace xmrstak;
 	
-	cout<<"Usage: "<<params::inst().executablePrefix<<" [--help|-h] [--benchmark] [-c CONFIGFILE] [CONFIG FILE]"<<endl;
+	cout<<"Usage: "<<params::inst().binaryName<<" [OPTIONS] [CONFIG FILE]"<<endl;
+
 }
 
 int main(int argc, char *argv[])
@@ -85,8 +86,9 @@ int main(int argc, char *argv[])
 		// try windows "\"
 		pos = pathWithName.rfind("\\");
 	}
-	
-	params::inst().executablePrefix = std::string(pathWithName, 0, pos);
+	params::inst().binaryName = std::string(pathWithName, pos + 1, std::string::npos);
+	if(params::inst().binaryName.compare(pathWithName) != 0)
+		params::inst().executablePrefix = std::string(pathWithName, 0, pos);
 
 	for(int i = 1; i < argc; ++i)
 	{

xmrstak/params.hpp

@@ -19,6 +19,7 @@ struct params
 	}
 
 	std::string executablePrefix;
+	std::string binaryName;
 	bool useAMD;
 	bool useNVIDIA;
 	bool useCPU;
@@ -33,6 +34,8 @@ struct params
 	std::string configFileCPU;
 
 	params() :
+		binaryName("xmr-stak"),
+		executablePrefix("./"),
 		useAMD(true),
 		useNVIDIA(true),
 		useCPU(true),