Building GDB 7.10 with Python support

Building GDB 7.10 with Python support

[Albert Chin]

I built a custom version of Python 2.7.5 for RHEL 6/x86-64 and am
trying to use it to build gdb-7.10. I can build gdb-7.10 but it has
problems:
  $ gtar Jxf gdb-7.10.tar.xz
  $ cd gdb-7.10
  $ PATH=/opt/TWWfsw/python27/bin:$PATH \
    CFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config" \
    LDFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config \
    -Wl,-rpath,/opt/TWWfsw/python27/lib/python2.7/config" \
    ./configure --prefix=/tmp/gdb
  $ PATH=/opt/TWWfsw/python27/bin:$PATH \
    CFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config" \
    LDFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config \
    -Wl,-rpath,/opt/TWWfsw/python27/lib/python2.7/config" \
    make
  $ PATH=/opt/TWWfsw/python27/bin:$PATH \
    CFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config" \
    LDFLAGS="-I/opt/TWWfsw/python27/lib/python2.7/config \
    -Wl,-rpath,/opt/TWWfsw/python27/lib/python2.7/config" \
    make install

  $ ldd /tmp/gdb/bin/gdb
        linux-vdso.so.1 =>  (0x00007fffa7fe4000)
        libdl.so.2 => /lib64/libdl.so.2 (0x00000030e3000000)
        libncurses.so.5 => /lib64/libncurses.so.5 (0x0000003fb2200000)
        libm.so.6 => /lib64/libm.so.6 (0x00000030e2c00000)
        libpthread.so.0 => /lib64/libpthread.so.0 (0x00000030e3400000)
        libutil.so.1 => /lib64/libutil.so.1 (0x00000030f2800000)
        libpython2.7.so => /opt/TWWfsw/python27/lib/python2.7/config/libpython2.7.so (0x00007feaec72d000)
        libexpat.so.1 => /lib64/libexpat.so.1 (0x000000359b800000)
        libc.so.6 => /lib64/libc.so.6 (0x00000030e2800000)
        libtinfo.so.5 => /lib64/libtinfo.so.5 (0x0000003fb1200000)
        /lib64/ld-linux-x86-64.so.2 (0x00000030e2000000)

  $ /tmp/gdb/bin/gdb a.out
  ...
  (gdb) break main
  Breakpoint 1 at 0x4004c8: file d.c, line 57.
  (gdb) r
  Starting program: /opt/src/latest/devel/gdb-7.10/a.out 
  A Unwinder should return gdb.UnwindInfo instance.
  findvar.c:290: internal-error: value_of_register_lazy: Assertion `frame_id_p (get_frame_id (frame))' failed.
  A problem internal to GDB has been detected,
  further debugging may prove unreliable.
  Quit this debugging session? (y or n) n

Any ideas where I can start looking? The Python 2.7.5 I built seems to
work ok outside of this issue.

-- 
albert chin (china@thewrittenword.com)

Re: Building GDB 7.10 with Python support

[Eli Zaretskii]

> Date: Fri, 9 Oct 2015 16:56:03 -0500
> From: Albert Chin <gdb@mlists.thewrittenword.com>
> 
>   (gdb) break main
>   Breakpoint 1 at 0x4004c8: file d.c, line 57.
>   (gdb) r
>   Starting program: /opt/src/latest/devel/gdb-7.10/a.out 
>   A Unwinder should return gdb.UnwindInfo instance.
>   findvar.c:290: internal-error: value_of_register_lazy: Assertion `frame_id_p (get_frame_id (frame))' failed.
>   A problem internal to GDB has been detected,
>   further debugging may prove unreliable.
>   Quit this debugging session? (y or n) n
> 
> Any ideas where I can start looking?

I'd start where the error message points you, i.e. in findvar.c at
line 290, where you had the assertion violation.  It looks like
get_frame_id failed, so you'd probably need to step with a debugger
into that function and see what's going on there.