[Bug preprocessor/83449] New: incorrect ## preprocessing with string

[asif_bahrainwala at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83449

            Bug ID: 83449
           Summary: incorrect ## preprocessing with string
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asif_bahrainwala at hotmail dot com
  Target Milestone: ---

g++ --version
g++ (Ubuntu 7.2.0-8ubuntu3) 7.2.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
The below code does not compile, compiles on VS2017 though


#include <iostream>

using namespace std;
#define STRMAX 1024

#define A(a,b) a ## b

int main()
{
    char *i=A("a","b");
    cout<<i;
    return 0;
}