Make cached library a warning

Ref: #15 (comment)

Author: CarterLi

MacDependency/MachOModel.mm

@@ -51,9 +51,8 @@ - (id) initWithFilename:(std::string&)filename command:(DylibCommand*)aCommand d
 			NSString* log = [NSString stringWithFormat:NSLocalizedString(@"ERR_ARCHITECTURE_MISMATCH", nil), filename.c_str(), [parent name]];
 			[aDocument appendLogLine:log withModel:self state:state];
 		}
-
-	}  catch (MachOException& exc) {
-		[self setStateWithWarning:isWeakReference];
+	} catch (MachOException& exc) {
+		[self setStateWithWarning:isWeakReference || exc.isWarning()];
 		NSString* log = [NSString stringWithStdString:exc.getCause()];
 		[aDocument appendLogLine:log withModel:self state:state];
 		// distinguish between weak and strong. In both cases append to tree with a status color
@@ -176,10 +175,10 @@ - (NSColor*) textColor {
 	NSColor* color;
 	switch(state) {
 		case StateWarning:
-			color = [NSColor systemOrangeColor];
+			color = [NSColor systemYellowColor];
 			break;
 		case StateError:
-			color = [NSColor systemOrangeColor];
+			color = [NSColor systemRedColor];
 			break;
 		default:
 			color = [NSColor labelColor];

MachO/internalfile.cpp

@@ -1,6 +1,8 @@
 #include "internalfile.h"
 #include "machoexception.h"
 
+#include <dlfcn.h>
+
 // use reference counting to reuse files for all used architectures
 InternalFile* InternalFile::create(InternalFile* file) {
   file->counter++;
@@ -24,9 +26,13 @@ filename(filename), counter(1)
   // open file handle
   file.open(this->filename, std::ios_base::in | std::ios_base::binary);
   if (file.fail()) {
-    std::ostringstream error;
-    error << "Couldn't open file '" << filename << "'.";
-    throw MachOException(error.str());
+    void* dylib = dlopen(this->filename.c_str(), RTLD_LAZY);
+    if (dylib) {
+      dlclose(dylib);
+      throw MachOException("System cached library '" + filename + "'.", true);
+    } else {
+      throw MachOException("Couldn't open file '" + filename + "'.");
+    }
   }
 
   struct stat buffer;

MachO/machoexception.cpp

@@ -1,6 +1,9 @@
 #include "machoexception.h"
 
-MachOException::MachOException(const std::string& cause) : cause(cause)
+MachOException::MachOException(const std::string& cause) : cause(cause), warning(false)
 {
 }
 
+MachOException::MachOException(const std::string& cause, bool warning) : cause(cause), warning(warning)
+{
+}

MachO/machoexception.h

@@ -7,9 +7,12 @@ class EXPORT MachOException
 {
 public:
   MachOException(const std::string&);
+  MachOException(const std::string&, bool warning);
   const std::string& getCause() { return cause; }
+  const bool isWarning() { return warning; }
 private:
   const std::string cause;
+  bool warning;
 };
 
 #endif // MACHOEXCEPTION_H