[Bug c++/17124] New: GDB incorrectly says that std::string::npos is of type string

[Bug c++/17124] New: GDB incorrectly says that std::string::npos is of type string

[dodji at seketeli dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17124

            Bug ID: 17124
           Summary: GDB incorrectly says that std::string::npos is of type
                    string
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: c++
          Assignee: unassigned at sourceware dot org
          Reporter: dodji at seketeli dot org

Created attachment 7683
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7683&action=edit
Debug info of the test program

with gdb version "GNU gdb (GDB) Fedora 7.7.90.20140627-8.fc21" and gcc version
"gcc (GCC) 4.9.0 20140604 (Red Hat 4.9.0-8)" (these are from Rawhide), please
consider this little test program in a file named test.cc:

--------------->8<-----------------------
#include <string>

int
main()
{
  std::string s = "hah";
  return 0;
}
--------------->8<-----------------------

Then compile by typing:
g++ -g -o test test.cc

Then run gdb on it by up to the line containing the "return 0;" statement by
doing:

gdb test
break main
run
next

Then inspect the type of std::string::npos by doing:

ptype std::string::npos

This is what I am getting:

(gdb) ptype std::string::npos
type = std::string
(gdb)

Find attached the debug info of the program "test", that I got by running
eu-readelf --debug-dump=info test > test.debug

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[Bug c++/17124] GDB incorrectly says that std::string::npos is of type string

[jwakely.gcc at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17124

Jonathan Wakely <jwakely.gcc at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jwakely.gcc at gmail dot com

--- Comment #1 from Jonathan Wakely <jwakely.gcc at gmail dot com> ---
Reproducible with this smaller program:

typedef unsigned long size_t;

template<typename T>
struct allocator
{
  typedef size_t size_type;
};

template<typename T, typename A = allocator<T> >
struct basic_string
{
  typedef typename A::size_type size_type;
  static const size_type npos = -1;
};

typedef basic_string<char> str;


int main()
{
  str s;
  return 0;
}


(gdb) ptype str::npos
type = struct basic_string<char, allocator<char> > [with T = char, A =
allocator<char>] {
    static size_type npos;

    typedef A::size_type size_type;
}

(N.B. I had to call the type 'str' because when I called it 'string' GDB got
confused and "ptype string::npos" gave a syntax error)

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[Bug c++/17124] GDB incorrectly says that std::string::npos is of type string

[bogdan.slusarczyk at aldec dot com.pl]

https://sourceware.org/bugzilla/show_bug.cgi?id=17124

Bogdan <bogdan.slusarczyk at aldec dot com.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bogdan.slusarczyk at aldec dot com
                   |                            |.pl

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[Bug c++/17124] GDB incorrectly says that std::string::npos is of type string

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17124

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |8.2
                 CC|                            |ssbssa at sourceware dot org

--- Comment #2 from Hannes Domani <ssbssa at sourceware dot org> ---
(In reply to Jonathan Wakely from comment #1)
> Reproducible with this smaller program:
> 
> typedef unsigned long size_t;
> 
> template<typename T>
> struct allocator
> {
>   typedef size_t size_type;
> };
> 
> template<typename T, typename A = allocator<T> >
> struct basic_string
> {
>   typedef typename A::size_type size_type;
>   static const size_type npos = -1;
> };
> 
> typedef basic_string<char> str;
> 
> 
> int main()
> {
>   str s;
>   return 0;
> }
> 
> 
> (gdb) ptype str::npos
> type = struct basic_string<char, allocator<char> > [with T = char, A =
> allocator<char>] {
>     static size_type npos;
> 
>     typedef A::size_type size_type;
> }
> 
> (N.B. I had to call the type 'str' because when I called it 'string' GDB got
> confused and "ptype string::npos" gave a syntax error)

I can reproduce this issue with gdb up to 8.1.1, but it works fine since 8.2:

(gdb) pt str
type = struct basic_string<char, allocator<char> > [with T = char, A =
allocator<char>] {
    static size_type npos;

    typedef A::size_type size_type;
}
(gdb) pt str::npos
type = const unsigned long

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