Bug 582052

Created attachment 406385 [details]
tiny C++ program to demonstrate the problem

Description of problem:

When trying to print an std::string variable in gdb one gets something like the following:

  File "/usr/lib64/../share/gdb/python/libstdcxx/v6/printers.py", line 549, in to_string
    return self.val['_M_dataplus']['_M_p'].lazy_string (length = len)
AttributeError: 'gdb.Value' object has no attribute 'lazy_string'

Version-Release number of selected component (if applicable):

gdb: 7.0.1.43.fc12

How reproducible:

Always.

Steps to Reproduce:

1. Compile the attached program with -g option (e.g., "g++ -g -o string string.cpp")
2. open in gdb, break in main and step through 8
3. issue "print str" in gdb, observe the above error
  
Actual results:

(gdb) break main
Breakpoint 1 at 0x40075f: file string.cpp, line 7.
(gdb) run
Starting program: /home/igor/code/Junk/string 

Breakpoint 1, main () at string.cpp:7
7	    string str = "foobar";
(gdb) n
8	    return 0;
(gdb) print str
$1 = Traceback (most recent call last):
  File "/usr/lib64/../share/gdb/python/libstdcxx/v6/printers.py", line 549, in to_string
    return self.val['_M_dataplus']['_M_p'].lazy_string (length = len)
AttributeError: 'gdb.Value' object has no attribute 'lazy_string'


Expected results:

I expected the string's value, i.e., "foobar" in this case, to be printed.

Additional info:

It sounds like this might be relevant: http://old.nabble.com/-Bug-python-11248--New:-Error-while-printing-std::string-with-printers-td27451999.html