show correct exceptions: fix exception memory access bug

COPYING

@@ -1 +1 @@
-/usr/share/automake-1.13/COPYING
+/usr/share/automake-1.15/COPYING

INSTALL

@@ -1 +1 @@
-/usr/share/automake-1.13/INSTALL
+/usr/share/automake-1.15/INSTALL

src/exceptions.hxx

@@ -16,8 +16,9 @@ class Exception: public std::exception {
     Exception(QString w): _what(w) {}
     ~Exception() throw() {}
     const char* what() const throw() {
-      _bytes = _what.toUtf8();
-      return _bytes.data();
+      static QByteArray bytes;
+      bytes = _what.toUtf8();
+      return bytes.data();
     }
     void line(int linenr) {
       if (linenr>0) _what=QString::number(linenr)+" "+_what;
@@ -26,7 +27,6 @@ class Exception: public std::exception {
       if (filename.size()) _what=filename+":"+_what;
     }
   protected:
-    QByteArray _bytes;
     QString _what;
 };