add std::string SharedLibrary::prefix() for building library name that

complies with Cygwin standard.

Signed-off-by: FrancisANDRE <zosrothko@orange.fr>

Foundation/include/Poco/SharedLibrary.h

@@ -118,6 +118,12 @@ public:
 		/// specified in a call to load() or the 
 		/// constructor.
 		
+	static std::string prefix();
+		/// Returns the platform-specific filename prefix
+		/// for shared libraries.
+		/// Most platforms would return an empty string, but
+	    /// on Cygwin, the "cyg" prefix will be returned.
+		
 	static std::string suffix();
 		/// Returns the platform-specific filename suffix
 		/// for shared libraries (including the period).

Foundation/include/Poco/SharedLibrary_HPUX.h

@@ -38,6 +38,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/include/Poco/SharedLibrary_UNIX.h

@@ -43,6 +43,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/include/Poco/SharedLibrary_VMS.h

@@ -37,6 +37,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/include/Poco/SharedLibrary_VX.h

@@ -38,6 +38,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/include/Poco/SharedLibrary_WIN32.h

@@ -37,6 +37,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/include/Poco/SharedLibrary_WIN32U.h

@@ -37,6 +37,7 @@ protected:
 	bool isLoadedImpl() const;
 	void* findSymbolImpl(const std::string& name);
 	const std::string& getPathImpl() const;
+	static std::string prefixImpl();
 	static std::string suffixImpl();
 
 private:

Foundation/src/SharedLibrary.cpp

@@ -104,6 +104,12 @@ const std::string& SharedLibrary::getPath() const
 }
 
 
+std::string SharedLibrary::prefix()
+{
+	return prefixImpl();
+}
+
+
 std::string SharedLibrary::suffix()
 {
 	return suffixImpl();

Foundation/src/SharedLibrary_HPUX.cpp

@@ -83,6 +83,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 #if defined(_DEBUG)

Foundation/src/SharedLibrary_UNIX.cpp

@@ -20,7 +20,7 @@
 
 
 // Note: cygwin is missing RTLD_LOCAL, set it to 0
-#if defined(__CYGWIN__) && !defined(RTLD_LOCAL)
+#if POCO_OS == POCO_OS_CYGWIN && !defined(RTLD_LOCAL)
 #define RTLD_LOCAL 0
 #endif
 
@@ -99,21 +99,31 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+#if POCO_OS == POCO_OS_CYGWIN
+	return "cyg";
+#else
+	return "";
+#endif
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
-#if defined(__APPLE__)
+#if POCO_OS == POCO_OS_MAC_OS_X
 	#if defined(_DEBUG)
 		return "d.dylib";
 	#else
 		return ".dylib";
 	#endif
-#elif defined(hpux) || defined(_hpux)
+#elif POCO_OS == POCO_OS_HPUX
 	#if defined(_DEBUG)
 		return "d.sl";
 	#else
 		return ".sl";
 	#endif
-#elif defined(__CYGWIN__)
+#elif POCO_OS == POCO_OS_CYGWIN
 	#if defined(_DEBUG)
 		return "d.dll";
 	#else

Foundation/src/SharedLibrary_VMS.cpp

@@ -106,6 +106,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 #if defined(_DEBUG)

Foundation/src/SharedLibrary_VX.cpp

@@ -128,6 +128,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 	return ".out";

Foundation/src/SharedLibrary_WIN32.cpp

@@ -87,6 +87,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 #if defined(_DEBUG)

Foundation/src/SharedLibrary_WIN32U.cpp

@@ -98,6 +98,12 @@ const std::string& SharedLibraryImpl::getPathImpl() const
 }
 
 
+std::string SharedLibraryImpl::prefixImpl()
+{
+	return "";
+}
+
+
 std::string SharedLibraryImpl::suffixImpl()
 {
 #if defined(_DEBUG)