search for linux backend plugins

- search for plugin in
  - working directory
  - binary directory
  - let linux search the plugins (libraries)

xmrstak/backend/plugin.hpp

@@ -43,7 +43,14 @@ struct plugin
 		// `.dylib` Mac OS X file extention for dynamic libraries
 		fileExtension = ".dylib";
 #	endif
-		libBackend = dlopen((params::inst().executablePrefix + "/lib" + libName + fileExtension).c_str(), RTLD_LAZY);
+		// search library in working directory
+		libBackend = dlopen(("./lib" + libName + fileExtension).c_str(), RTLD_LAZY);
+		// fallback to binary directory
+		if(!libBackend)
+			libBackend = dlopen((params::inst().executablePrefix + "lib" + libName + fileExtension).c_str(), RTLD_LAZY);
+		// try use LD_LIBRARY_PATH
+		if(!libBackend)
+			libBackend = dlopen(("lib" + libName + fileExtension).c_str(), RTLD_LAZY);
 		if(!libBackend)
 		{
 			std::cerr << "WARNING: "<< m_backendName <<" cannot load backend library: " << dlerror() << std::endl;

xmrstak/cli/cli-miner.cpp

@@ -106,15 +106,21 @@ int main(int argc, char *argv[])
 	using namespace xmrstak;
 
 	std::string pathWithName(argv[0]);
-	auto pos = pathWithName.rfind("/");
+	std::string seperator("/");
+	auto pos = pathWithName.rfind(seperator);
+
 	if(pos == std::string::npos)
 	{
 		// try windows "\"
-		pos = pathWithName.rfind("\\");
+		seperator = "\\";
+		pos = pathWithName.rfind(seperator);
 	}
 	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);
+		params::inst().executablePrefix += seperator;
+	}
 
 	bool userSetPasswd = false;
 	for(int i = 1; i < argc; ++i)

xmrstak/params.hpp

@@ -37,7 +37,7 @@ struct params
 
 	params() :
 		binaryName("xmr-stak"),
-		executablePrefix("./"),
+		executablePrefix(""),
 		useAMD(true),
 		useNVIDIA(true),
 		useCPU(true),