Custom target json not found after toolchain update

[Shinribo]

Otherwise please try to provide information which will help us to fix the issue faster. Minimal reproducible examples with few dependencies are especially lovely <3.
-->After updating my nightly toolchain rust-analyser fails to find my custom target json. Cargo can still build the code however.

rust-analyzer version: 0.3.2711-standalone (5e3e9c4 2025-12-07)

rustc version: rustc 1.94.0-nightly (f52090008 2025-12-10)

editor or extension: VSCode

relevant settings:

#Config.toml
[env]
RUST_TARGET_PATH = { value = "target-specs", relative = true }

[build]
target = ["x86_64-unknown-trinium-kernel.json"]


[release]
overflow-check = true
codegen-units = 1
lto = true
opt-level = "3"

[debug]
overflow-check = true
codegen-units = 128
lto = true
opt-level = "3"

[unstable]
build-std-features = ["compiler-builtins-mem"]
build-std = ["core", "compiler_builtins", "alloc"]

{
  "llvm-target": "x86_64-unknown-none",
  "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128",
  "arch": "x86_64",
  "target-endian": "little",
  "target-pointer-width": 64,
  "target-c-int-width": 32,
  "max-atomic-width": 64,
  "os": "none",
  "executables": true,
  "linker-flavor": "ld.lld",
  "linker": "rust-lld",
  "panic-strategy": "abort",
  "disable-redzone": true,
  "features": "-mmx,-sse,-sse2,+soft-float",
  "rustc-abi": "x86-softfloat",
  "dynamic-linking": false,
  "relocation-model": "pie",
  "tls-model": "local-exec",
  "code-model": "kernel",
  "exe-suffix": ".elf",
  "has-rpath": false,
  "no-default-libraries": true,
  "position-independent-executables": true,
  "pre-link-args": {
    "ld.lld": [ "--script=link.ld" ]
  }
}

error:

2025-12-12T10:45:35.8334203+01:00  WARN `cargo metadata` failed and returning succeeded result with `--no-deps` error=`cargo metadata` exited with an error: error: target path "x86_64-unknown-trinium-kernel.json" is not a valid file

Caused by:
  the path was not found


Stack backtrace:
   0: std::backtrace_rs::backtrace::win64::trace
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1: std::backtrace_rs::backtrace::trace_unsynchronized
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2: std::backtrace::Backtrace::create
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:331
   3: std::backtrace::Backtrace::capture
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:296
   4: anyhow::error::<impl core::convert::From<E> for anyhow::Error>::from
   5: project_model::cargo_workspace::FetchMetadata::exec
   6: project_model::sysroot::Sysroot::load_workspace
   7: std::sys::backtrace::__rust_begin_short_backtrace
   8: hashbrown::raw::RawTable<T,A>::reserve_rehash
   9: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  10: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  11: std::sys::thread::windows::impl$0::new::thread_start
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\sys\thread\windows.rs:60
  12: BaseThreadInitThunk
  13: RtlUserThreadStart
2025-12-12T10:45:36.5777419+01:00  WARN `cargo metadata` failed and returning succeeded result with `--no-deps` error=`cargo metadata` exited with an error: error: target path "x86_64-unknown-trinium-kernel.json" is not a valid file

Caused by:
  the path was not found


Stack backtrace:
   0: std::backtrace_rs::backtrace::win64::trace
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1: std::backtrace_rs::backtrace::trace_unsynchronized
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2: std::backtrace::Backtrace::create
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:331
   3: std::backtrace::Backtrace::capture
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:296
   4: anyhow::error::<impl core::convert::From<E> for anyhow::Error>::from
   5: project_model::cargo_workspace::FetchMetadata::exec
   6: project_model::sysroot::Sysroot::load_workspace
   7: std::sys::backtrace::__rust_begin_short_backtrace
   8: hashbrown::raw::RawTable<T,A>::reserve_rehash
   9: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  10: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  11: std::sys::thread::windows::impl$0::new::thread_start
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\sys\thread\windows.rs:60
  12: BaseThreadInitThunk
  13: RtlUserThreadStart
2025-12-12T10:45:37.0867725+01:00  WARN `cargo metadata` failed and returning succeeded result with `--no-deps` error=`cargo metadata` exited with an error: error: target path "x86_64-unknown-trinium-kernel.json" is not a valid file

Caused by:
  the path was not found


Stack backtrace:
   0: std::backtrace_rs::backtrace::win64::trace
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\win64.rs:85
   1: std::backtrace_rs::backtrace::trace_unsynchronized
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2: std::backtrace::Backtrace::create
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:331
   3: std::backtrace::Backtrace::capture
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\backtrace.rs:296
   4: anyhow::error::<impl core::convert::From<E> for anyhow::Error>::from
   5: project_model::cargo_workspace::FetchMetadata::exec
   6: project_model::sysroot::Sysroot::load_workspace
   7: std::sys::backtrace::__rust_begin_short_backtrace
   8: hashbrown::raw::RawTable<T,A>::reserve_rehash
   9: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  10: alloc::boxed::impl$29::call_once
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\alloc\src\boxed.rs:1985
  11: std::sys::thread::windows::impl$0::new::thread_start
             at /rustc/ed61e7d7e242494fb7057f2657300d9e77bb4fcb/library\std\src\sys\thread\windows.rs:60
  12: BaseThreadInitThunk
  13: RtlUserThreadStart
2025-12-12T10:45:37.4188182+01:00 ERROR Received compiler message for unknown package: path+file:///C:/Users/juven/.rustup/toolchains/nightly-2025-12-12-x86_64-pc-windows-msvc/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins#compiler_builtins@0.1.160
 registry+https://github.com/rust-lang/crates.io-index#x86_64@0.15.2, registry+https://github.com/rust-lang/crates.io-index#lock_api@0.4.12, registry+https://github.com/rust-lang/crates.io-index#ucs2@0.3.3, registry+https://github.com/rust-lang/crates.io-index#ptr_meta_derive@0.2.0, registry+https://github.com/rust-lang/crates.io-index#lazy_static@1.5.0, registry+https://github.com/rust-lang/crates.io-index#bit_field@0.10.2, registry+https://github.com/rust-lang/crates.io-index#autocfg@1.4.0, registry+https://github.com/rust-lang/crates.io-index#cfg-if@1.0.0, registry+https://github.com/rust-lang/crates.io-index#scopeguard@1.2.0, registry+https://github.com/rust-lang/crates.io-index#uguid@2.2.0, registry+https://github.com/rust-lang/crates.io-index#uefi@0.32.0, registry+https://github.com/rust-lang/crates.io-index#ptr_meta@0.2.0, registry+https://github.com/rust-lang/crates.io-index#heck@0.4.1, registry+https://github.com/rust-lang/crates.io-index#syn@2.0.90, registry+https://github.com/rust-lang/crates.io-index#unicode-ident@1.0.14, registry+https://github.com/rust-lang/crates.io-index#quote@1.0.37, registry+https://github.com/rust-lang/crates.io-index#subenum@1.1.2, registry+https://github.com/rust-lang/crates.io-index#limine@0.5.0, registry+https://github.com/rust-lang/crates.io-index#bitflags@2.6.0, registry+https://github.com/rust-lang/crates.io-index#allocator-api2@0.2.21, registry+https://github.com/rust-lang/crates.io-index#raw-cpuid@11.2.0, path+file:///C:/Users/juven/Documents/Synology%20Drive%20Copy/trinium-kernel#0.1.0, registry+https://github.com/rust-lang/crates.io-index#spin@0.9.8, registry+https://github.com/rust-lang/crates.io-index#uefi-macros@0.16.0, registry+https://github.com/rust-lang/crates.io-index#equivalent@1.0.1, registry+https://github.com/rust-lang/crates.io-index#proc-macro2@1.0.92, registry+https://github.com/rust-lang/crates.io-index#enumn@0.1.14, registry+https://github.com/rust-lang/crates.io-index#log@0.4.22, registry+https://github.com/rust-lang/crates.io-index#uefi-raw@0.8.0, registry+https://github.com/rust-lang/crates.io-index#foldhash@0.1.3, registry+https://github.com/rust-lang/crates.io-index#volatile@0.4.6, registry+https://github.com/rust-lang/crates.io-index#syn@1.0.109, registry+https://github.com/rust-lang/crates.io-index#hashbrown@0.15.2, registry+https://github.com/rust-lang/crates.io-index#bitfield-struct@0.10.1, registry+https://github.com/rust-lang/crates.io-index#rustversion@1.0.18
2025-12-12T10:45:37.4190911+01:00 ERROR Received compiler message for unknown package: path+file:///C:/Users/juven/.rustup/toolchains/nightly-2025-12-12-x86_64-pc-windows-msvc/lib/rustlib/src/rust/library/compiler-builtins/compiler-builtins#compiler_builtins@0.1.160
 registry+https://github.com/rust-lang/crates.io-index#x86_64@0.15.2, registry+https://github.com/rust-lang/crates.io-index#lock_api@0.4.12, registry+https://github.com/rust-lang/crates.io-index#ucs2@0.3.3, registry+https://github.com/rust-lang/crates.io-index#ptr_meta_derive@0.2.0, registry+https://github.com/rust-lang/crates.io-index#lazy_static@1.5.0, registry+https://github.com/rust-lang/crates.io-index#bit_field@0.10.2, registry+https://github.com/rust-lang/crates.io-index#autocfg@1.4.0, registry+https://github.com/rust-lang/crates.io-index#cfg-if@1.0.0, registry+https://github.com/rust-lang/crates.io-index#scopeguard@1.2.0, registry+https://github.com/rust-lang/crates.io-index#uguid@2.2.0, registry+https://github.com/rust-lang/crates.io-index#uefi@0.32.0, registry+https://github.com/rust-lang/crates.io-index#ptr_meta@0.2.0, registry+https://github.com/rust-lang/crates.io-index#heck@0.4.1, registry+https://github.com/rust-lang/crates.io-index#syn@2.0.90, registry+https://github.com/rust-lang/crates.io-index#unicode-ident@1.0.14, registry+https://github.com/rust-lang/crates.io-index#quote@1.0.37, registry+https://github.com/rust-lang/crates.io-index#subenum@1.1.2, registry+https://github.com/rust-lang/crates.io-index#limine@0.5.0, registry+https://github.com/rust-lang/crates.io-index#bitflags@2.6.0, registry+https://github.com/rust-lang/crates.io-index#allocator-api2@0.2.21, registry+https://github.com/rust-lang/crates.io-index#raw-cpuid@11.2.0, path+file:///C:/Users/juven/Documents/Synology%20Drive%20Copy/trinium-kernel#0.1.0, registry+https://github.com/rust-lang/crates.io-index#spin@0.9.8, registry+https://github.com/rust-lang/crates.io-index#uefi-macros@0.16.0, registry+https://github.com/rust-lang/crates.io-index#equivalent@1.0.1, registry+https://github.com/rust-lang/crates.io-index#proc-macro2@1.0.92, registry+https://github.com/rust-lang/crates.io-index#enumn@0.1.14, registry+https://github.com/rust-lang/crates.io-index#log@0.4.22, registry+https://github.com/rust-lang/crates.io-index#uefi-raw@0.8.0, registry+https://github.com/rust-lang/crates.io-index#foldhash@0.1.3, registry+https://github.com/rust-lang/crates.io-index#volatile@0.4.6, registry+https://github.com/rust-lang/crates.io-index#syn@1.0.109, registry+https://github.com/rust-lang/crates.io-index#hashbrown@0.15.2, registry+https://github.com/rust-lang/crates.io-index#bitfield-struct@0.10.1, registry+https://github.com/rust-lang/crates.io-index#rustversion@1.0.18

[ChayimFriedman2]

Hmm, probably #20964. CC @ShoyuVanilla.

[ShoyuVanilla]

Well, that was superseded by #21015 but I'll look into this anyway

[ShoyuVanilla]

Is the second code block your x86_64-unknown-trinium-kernel.json file? Where is it located? If you could let me know your project structure -including the former question and the location of your config.toml file, etc ...- it would be greatly helpful, as I'm failing to reproduce this.

[Shinribo]

trinium-kernel.zip

Is the second code block your x86_64-unknown-trinium-kernel.json file? Where is it located? If you could let me know your project structure -including the former question and the location of your config.toml file, etc ...- it would be greatly helpful, as I'm failing to reproduce this.

x86_64-unknown-trinium-kernel.json is the second code block

here is the current project, ignore all the errors in the source code, those where there before this problem appeared
its not pushed to github yet (at least this version)