[Bug rust/26148] New: Unable to break within rust source code

["summers.ryan.m at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26148

            Bug ID: 26148
           Summary: Unable to break within rust source code
           Product: gdb
           Version: 9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: summers.ryan.m at gmail dot com
  Target Milestone: ---

When using gdb-multiarch to debug an embedded Rust target, GDB may fail to set
breakpoints when specifying source code lines.

A demonstration project has been created at
https://github.com/ryan-summers/rust-rtic-gdb-bug to reproduce the bug. When
attempting to set a breakpoint within the src/main.rs file using `b
main.rs:38`, a breakpoint is instead created at `main.rs:49`.


> Breakpoint 1 at 0x80006cc: file /home/ryan/.cargo/registry/src/github.com-1ecc6299db9ec823/cortex-m-rt-0.6.12/src/lib.rs, line 562.
> Breakpoint 2 at 0x8002846: file src/main.rs, line 49.
> Breakpoint 3 at 0x8002552: file /home/ryan/.cargo/registry/src/github.com-1ecc6299db9ec823/panic-halt-0.2.0/src/lib.rs, line 32.
> Loading section .vector_table, size 0x298 lma 0x8000000
> Loading section .text, size 0x25d0 lma 0x8000298
> Loading section .rodata, size 0xebc lma 0x8002868
> Start address 0x08000664, load size 14116
> Transfer rate: 12 KB/sec, 4705 bytes/write.
> target halted due to debug-request, current mode: Thread 
> xPSR: 0x01000000 pc: 0x08000664 msp: 0x20020000, semihosting
> (gdb) b main.rs:38
> Note: breakpoint 2 also set at pc 0x8002846.
> Breakpoint 4 at 0x8002846: file src/main.rs, line 49.
> (gdb) 


When the rust source at
https://github.com/ryan-summers/rust-rtic-gdb-bug/blob/4a6cb53c0f4a2bb1c4e1c998246db007dc68621a/src/main.rs#L26

is changed from
```
        test_object: Container<Object<'static>,>,
```
to
```
        test_object: Container<Object<'static>>,
```

GDB is again able to set breakpoints within the `main.rs` file.

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