// Very simple class, containing string s[7] in header file:
// myClass.cc:

 #include "myClass.h"
 ClassImp(myClass)
 myClass::myClass() {} // Constructor
 myClass::~myClass() {} // Destructor

// myClass.h:

 #include "TObject.h"
 class myClass : public TObject
 {
 public:  

   myClass(); // Constructor
   ~myClass(); // Destructor
   ClassDef(myClass,1)
 };

// also define a myClass_LinkDef.h:

 #ifdef __CINT__  

 #pragma link off all globals;
 #pragma link off all classes;
 #pragma link off all functions;

 #pragma link C++ class myClass;

 #endif

// I compile myClass with -fPIC option:
//   g++ myClass.cc -c `root-config --cflags --libs` -fPIC 
// this gives myClass.o.
// Then I create dictionary files:
//   rootcint -f myClass_dict.cc -c myClass.h
// this gives myClass_dict.cc and myClass_dict.h
// when I try to compile those too,
//   g++ myClass_dict.cc -c `root-config --cflags --libs` -fPIC
// I get the following error: 
//   myClass_dict.cc:119: error: request for member `c_str' in 
//   `((myClass*)this)->myClass::s', which is of non-class type `std::string[7]'
// Indeed, myClass_dict.cc generated by rootcint contains the line
//   { TString R__str = s.c_str(); 
// which is evidently not compilable!