[Bug c++/55148] New: wrong compilation of chars: overlapped memory areas

[icegood1980 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55148



             Bug #: 55148

           Summary: wrong compilation of chars: overlapped memory areas

    Classification: Unclassified

           Product: gcc

           Version: 4.7.2

            Status: UNCONFIRMED

          Severity: major

          Priority: P3

         Component: c++

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: icegood1...@gmail.com





if one uses a stringification operation then problems could be obtained on

stack:



brackets.cpp : 



#include <iostream>

#include <cstring>

#define GLOBAL_str_intermediate(s)                                            \

({                                                                            \

  char GLOBAL_str_intermediate_buf[1024];                                     \

  strcpy(GLOBAL_str_intermediate_buf, #s);                                    \

  GLOBAL_str_intermediate_buf[strlen(GLOBAL_str_intermediate_buf)-1]='\0';    \

  GLOBAL_str_intermediate_buf+1;                                              \

})



#define GLOBAL_str(s) GLOBAL_str_intermediate((s))

#define s_one_arg a,b,c



int main(int argc, const char **argv)

{

  char PairPotentialName[70], *p=GLOBAL_str(s_one_arg);

  //

  std::cerr<<p-PairPotentialName<<std::endl;

  std::cerr<<PairPotentialName+1<<std::endl;

  return 0;

}



g++ brackets.cpp 

./a.out:

1

a,b,c

so PairPotentialName and p are overlapped!