Build errors on a Windows ARM32 target since c1464fa

[kleisauke]

Since commit c1464fa, I'm getting the following build errors on a custom armv7-pc-windows-gnullvm target:

Details

error[E0609]: no field `Eip` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:170:54
    |
170 |             stack_frame_ex.AddrPC.Offset = context.0.Eip as u64;
    |                                                      ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

error[E0609]: no field `Esp` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:172:57
    |
172 |             stack_frame_ex.AddrStack.Offset = context.0.Esp as u64;
    |                                                         ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

error[E0609]: no field `Ebp` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:174:57
    |
174 |             stack_frame_ex.AddrFrame.Offset = context.0.Ebp as u64;
    |                                                         ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

error[E0609]: no field `Eip` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:208:53
    |
208 |             stack_frame64.AddrPC.Offset = context.0.Eip as u64;
    |                                                     ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

error[E0609]: no field `Esp` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:210:56
    |
210 |             stack_frame64.AddrStack.Offset = context.0.Esp as u64;
    |                                                        ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

error[E0609]: no field `Ebp` on type `backtrace_rs::windows::CONTEXT`
   --> /data/mxe/usr/x86_64-pc-linux-gnu/lib/rustlib/src/rust/library/std/src/../../backtrace/src/backtrace/dbghelp.rs:212:56
    |
212 |             stack_frame64.AddrFrame.Offset = context.0.Ebp as u64;
    |                                                        ^^^ unknown field
    |
    = note: available fields are: `ContextFlags`, `R0`, `R1`, `R2`, `R3` ... and 21 others

Looking at these logs, I think this also affects the thumbv7a-pc-windows-msvc and thumbv7a-uwp-windows-msvc targets. However, since no one's actively working on these targets¹ and the fact that is untested/unsupported territory², feel free to close this as invalid.

Footnotes

1. https://github.com/rust-lang/rust/issues/109030#issuecomment-1465051133 ↩

2. https://github.com/rust-lang/rust/issues/112265#issuecomment-1575468455 ↩

[ChrisDenton]

Thanks for the report! While support for Windows 32-bit arm is ambiguous at best, we'd certainly accept patches to fix small issues. In this case I think it should just be a matter of using Sp, Pc and Lr for arm in src/backtrace/dbghelp.rs.

[kleisauke]

Great! I just opened PR #573 for this.