riscv32imac-unknown-xous-elf: rust-lld gives offset is outside the section errors #103949
Description
Version it worked on
It most recently worked on: Rust 1.64.0
Version with regression
rustc --version --verbose:
rustc 1.65.0 (897e37553 2022-11-02)
binary: rustc
commit-hash: 897e37553bba8b42751c67658967889d11ecd120
commit-date: 2022-11-02
host: x86_64-pc-windows-msvc
release: 1.65.0
LLVM version: 15.0.0
Description
Building crates for the riscv32imac-unknown-xous-elf target sometimes results in a link error. This began with Rust 1.65.0. For example:
error: linking with `rust-lld` failed: exit code: 1
|
= note: "rust-lld" "-flavor" "gnu" "C:\\Users\\Sean\\AppData\\Local\\Temp\\rustcR77RGd\\symbols.o" "E:\\Code\\Xous\\Core\\target\\riscv32imac-unknown-xous-elf\\release\\deps\\pddb-8aba67b084ba8fc1.pddb-b3f235aec8c95441.n927u1iqdxcieg4.rcgu.o.rcgu.o" "--as-needed" "-L" "E:\\Code\\Xous\\Core\\target\\riscv32imac-unknown-xous-elf\\release\\deps" "-L" "E:\\Code\\Xous\\Core\\target\\release\\deps" "-L" "E:\\Code\\Xous\\Core\\target\\riscv32imac-unknown-xous-elf\\release\\build\\xous-08f083a692e5c29b\\out" "-L" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib" "-Bstatic" "C:\\Users\\Sean\\AppData\\Local\\Temp\\rustcR77RGd\\libxous-26655dcc7bb206b6.rlib" "C:\\Users\\Sean\\AppData\\Local\\Temp\\rustcR77RGd\\libxous-d175a8531300a7f7.rlib" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib\\libcompiler_builtins-67716ddc427f4546.rlib" "-Bdynamic" "--eh-frame-hdr" "-znoexecstack" "-L" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib" "-o" "E:\\Code\\Xous\\Core\\target\\riscv32imac-unknown-xous-elf\\release\\deps\\pddb-8aba67b084ba8fc1" "--gc-sections" "-O1"
= note: rust-lld: error: E:\Code\Xous\Core\target\riscv32imac-unknown-xous-elf\release\deps\pddb-8aba67b084ba8fc1.pddb-b3f235aec8c95441.n927u1iqdxcieg4.rcgu.o.rcgu.o:(.rodata.cst32): offset is outside the section
error: could not compile `pddb` due to previous error
Background
We build a custom libstd for the riscv32imac-unknown-xous-elf target, which is a Tier-3 target. This repository is at https://github.com/betrusted-io/rust. We are working on preparing patches for upstream that do not add any external dependencies, but this work is taking time. As a result, we generally forward-port our patchset every six weeks once the stable build is released.
When building packages for the Betrusted platform, our build system compiles around 27 packages. Many of these packages succeed, but with Rust 1.65.0 we have three packages fail.
This target does not have a linker script, and instead relies on the default one provided by rust-lld.
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