GDB Incorrectly Reads & Resolves Shared Library Symbols [MinGW-w64]

[Andrew Dinn]

On 31/10/2020 23:26, William Adair via Gdb wrote:
> Can anyone recommend a way to start debugging GDB? I've found that when I
> compile a 32-bit shared library that GDB is unable to correctly resolve the
> symbols in the image and set breakpoints. Even when I reach a segfault and
> print the backtrace, the symbols are incorrect or flat out missing. I
> already verified that the image has .debug_* sections as would be required
> for DWARF debugging, so I'm perplexed as to why GDB cannot correctly
> resolve it and am looking for guidance.
Well you can, of course, use your currently installed gdb to debug gdb.

Build gdb from a downloaded src tree using

  make install PREFIX=/path/to/install/dir CFLAGS=-g CXXFLAGS=-g.

Then run

  gdb --fullname /path/to/my/newly/built/gdb.

When you type run you will enter a nested gdb that you can debug.

Hint: before typing run type

(gdb) set prompt (outer)

That way you can distinguish prompts in the outer gdb from prompts in
the inner gdb.

n.b.b. make sure to type a space after (outer) or your typing will start
right next to the closing bracket
regards,

After that all you need to do is familiarize wiht the gdb source!


Andrew Dinn
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