<html>

    <head>

      <base href="https://llvm.org/bugs/" />

    </head>

    <body><table border="1" cellspacing="0" cellpadding="8">

        <tr>

          <th>Bug ID</th>

          <td><a class="bz_bug_link 

          bz_status_NEW " title="NEW --- - Can't print std::string in (c)gdb" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24202&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=gH_dAuoSknpgDmMohElTglirnLmkONco1tm_qYkaFnw&s=bKTfFKyncEgTMof03mh4lE1d4STR0tlbdOy3f4gRcpw&e=">24202</a>

          </td>

        </tr>

        <tr>

          <th>Summary</th>

          <td>Can't print std::string in (c)gdb

          </td>

        </tr>

        <tr>

          <th>Product</th>

          <td>new-bugs

          </td>

        </tr>

        <tr>

          <th>Version</th>

          <td>3.6

          </td>

        </tr>

        <tr>

          <th>Hardware</th>

          <td>PC

          </td>

        </tr>

        <tr>

          <th>OS</th>

          <td>Linux

          </td>

        </tr>

        <tr>

          <th>Status</th>

          <td>NEW

          </td>

        </tr>

        <tr>

          <th>Severity</th>

          <td>normal

          </td>

        </tr>

        <tr>

          <th>Priority</th>

          <td>P

          </td>

        </tr>

        <tr>

          <th>Component</th>

          <td>new bugs

          </td>

        </tr>

        <tr>

          <th>Assignee</th>

          <td>unassignedbugs@nondot.org

          </td>

        </tr>

        <tr>

          <th>Reporter</th>

          <td>davidbrcz@gmail.com

          </td>

        </tr>

        <tr>

          <th>CC</th>

          <td>llvmbugs@cs.uiuc.edu

          </td>

        </tr>

        <tr>

          <th>Classification</th>

          <td>Unclassified

          </td>

        </tr></table>

      <p>

        <div>

        <pre>I can't print a single std::string using (c)gdb while it works perfectly fine

with g++. When running the binary from clang, gdb complains that "There is no

member named _M_dataplus.:"

Please find bellow a full copy and paste from my terminal showing the bug

[david@dhcp-38-199 code]$ g++ -v

Using built-in specs.

COLLECT_GCC=/bin/g++

COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/5.1.1/lto-wrapper

Target: x86_64-redhat-linux

Configured with: ../configure --enable-bootstrap

--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr

--mandir=/usr/share/man --infodir=/usr/share/info

--with-bugurl=<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__bugzilla.redhat.com_bugzilla&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=gH_dAuoSknpgDmMohElTglirnLmkONco1tm_qYkaFnw&s=pUI2Yzl6bb1NAV_OAN0oyTXTVsX1uC1HpZoIuA9DYdc&e=">http://bugzilla.redhat.com/bugzilla</a> --enable-shared

--enable-threads=posix --enable-checking=release --enable-multilib

--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions

--enable-gnu-unique-object --enable-linker-build-id

--with-linker-hash-style=gnu --enable-plugin --enable-initfini-array

--disable-libgcj --with-default-libstdcxx-abi=c++98 --with-isl --enable-libmpx

--enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686

--build=x86_64-redhat-linux

Thread model: posix

gcc version 5.1.1 20150618 (Red Hat 5.1.1-4) (GCC) 

[david@dhcp-38-199 code]$ clang -v

clang version 3.6.1 (tags/RELEASE_361/final)

Target: x86_64-redhat-linux-gnu

Thread model: posix

Found candidate GCC installation: /bin/../lib/gcc/x86_64-redhat-linux/5.1.1

Found candidate GCC installation: /usr/lib/gcc/x86_64-redhat-linux/5.1.1

Selected GCC installation: /bin/../lib/gcc/x86_64-redhat-linux/5.1.1

Candidate multilib: .;@m64

Candidate multilib: 32;@m32

Selected multilib: .;@m64

[david@dhcp-38-199 code]$ cat d.cpp

#include <iostream>

#include <string>

using namespace std;

int main(int argc, char *argv[])

{

    std::string s = "abc";

    getchar();

    return 0;

}

[david@dhcp-38-199 code]$ clang++ -g -std=c++11 d.cpp -o d

[david@dhcp-38-199 code]$ gdb ./d

GNU gdb (GDB) Fedora 7.9.1-17.fc22

Copyright (C) 2015 Free Software Foundation, Inc.

License GPLv3+: GNU GPL version 3 or later <<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__gnu.org_licenses_gpl.html&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=gH_dAuoSknpgDmMohElTglirnLmkONco1tm_qYkaFnw&s=Rkw_-KjchIEHTGrnG3H77rC07TMsmuLf7voj61cL9MQ&e=">http://gnu.org/licenses/gpl.html</a>>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.  Type "show copying"

and "show warranty" for details.

This GDB was configured as "x86_64-redhat-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_software_gdb_bugs_&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=gH_dAuoSknpgDmMohElTglirnLmkONco1tm_qYkaFnw&s=eOJOYH_0ZqkQH8Ix2wnxPw64TU-vQq438v5aOMeEycI&e=">http://www.gnu.org/software/gdb/bugs/</a>>.

Find the GDB manual and other documentation resources online at:

<<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.gnu.org_software_gdb_documentation_&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=gH_dAuoSknpgDmMohElTglirnLmkONco1tm_qYkaFnw&s=S5FyvFlA9VthzlvGXPeaxU5DooIHF9DKK61C0X6VNIE&e=">http://www.gnu.org/software/gdb/documentation/</a>>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from ./d...done.

(gdb) b 10

Breakpoint 1 at 0x400a08: file d.cpp, line 10.

(gdb) run

Starting program: /home/david/code/d 

Missing separate debuginfos, use: dnf debuginfo-install

glibc-2.21-7.fc22.x86_64

Breakpoint 1, main (argc=1, argv=0x7fffffffdc58) at d.cpp:10

10        getchar();

Missing separate debuginfos, use: dnf debuginfo-install

libgcc-5.1.1-4.fc22.x86_64 libstdc++-5.1.1-4.fc22.x86_64

(gdb) print s

Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: 

$1 = 

(gdb) quit

A debugging session is active.

    Inferior 1 [process 8960] will be killed.

Quit anyway? (y or n) y

[david@dhcp-38-199 code]$ g++ -g -std=c++11 d.cpp -o d

[david@dhcp-38-199 code]$ gdb ./d

GNU gdb (GDB) Fedora 7.9.1-17.fc22