os error 2 (no such file or dir) when compiling rust-1.87.0

[stefson]

hello everyone,

there are about 360 of these os error 2, when I compile rustc locally from source:

running: "/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/llvm/bin/llvm-config" "--libdir" (failure_mode=Exit) (created at src/bootstrap/src/core/builder/cargo.rs:989:21, executed at src/bootstrap/src/core/builder/cargo.rs:989:58)
    c Sysroot { compiler: Compiler { stage: 1, host: x86_64-unknown-linux-gnu, forced_compiler: false }, force_recompile: false }
Building tool cargo (stage1 -> stage2, x86_64-unknown-linux-gnu)
running: cd "/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src" && env -u MAKEFLAGS -u MFLAGS AR_x86_64_unknown_linux_gnu="x86_64-pc-linux-gnu-ar" CARGO_INCREMENTAL="0" CARGO_LOG="cargo::core::compiler::fingerprint=info" CARGO_PROFILE_RELEASE_DEBUG="0" CARGO_PROFILE_RELEASE_DEBUG_ASSERTIONS="false" CARGO_PROFILE_RELEASE_OVERFLOW_CHECKS="false" CARGO_PROFILE_RELEASE_STRIP="false" CARGO_TARGET_DIR="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1-tools" CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER="x86_64-pc-linux-gnu-gcc" CC_x86_64_unknown_linux_gnu="x86_64-pc-linux-gnu-gcc" CFG_COMMIT_DATE="2025-05-06" CFG_COMMIT_HASH="99624be96e9d213b0e9b1e36451271f24e4a41d8" CFG_COMPILER_BUILD_TRIPLE="x86_64-unknown-linux-gnu" CFG_COMPILER_HOST_TRIPLE="x86_64-unknown-linux-gnu" CFG_RELEASE="1.87.0" CFG_RELEASE_CHANNEL="stable" CFG_RELEASE_NUM="1.87.0" CFG_SHORT_COMMIT_HASH="99624be96" CFG_VERSION="1.87.0 (17067e9ac 2025-05-09) (gentoo)" CFG_VER_DATE="2025-05-09" CFG_VER_DESCRIPTION="gentoo" CFG_VER_HASH="17067e9ac6d7ecb70e50f92c1944e545188d2359" CFG_VIRTUAL_RUST_SOURCE_BASE_DIR="/rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359" CFLAGS_x86_64_unknown_linux_gnu=" -m64" CXXFLAGS_x86_64_unknown_linux_gnu="" CXX_x86_64_unknown_linux_gnu="x86_64-pc-linux-gnu-g++" DOC_RUST_LANG_ORG_CHANNEL="https://doc.rust-lang.org/1.87.0" LIBC_CHECK_CFG="1" LZMA_API_STATIC="1" RANLIB_x86_64_unknown_linux_gnu="x86_64-pc-linux-gnu-ar s" REAL_LIBRARY_PATH_VAR="LD_LIBRARY_PATH" RUSTBUILD_NATIVE_DIR="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/native" RUSTC="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/bootstrap/debug/rustc" RUSTC_BACKTRACE_ON_ICE="1" RUSTC_BOOTSTRAP="1" RUSTC_BREAK_ON_ICE="1" RUSTC_CARGO_REGISTRY_SRC_TO_REMAP="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/vendor=/rust/deps" RUSTC_DEBUGINFO_MAP="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src=/rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359" RUSTC_ERROR_METADATA_DST="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/tmp/extended-error-metadata" RUSTC_HOST_FLAGS="-Zunstable-options --check-cfg=cfg(bootstrap) -Clinker=x86_64-pc-linux-gnu-gcc" RUSTC_INSTALL_BINDIR="bin" RUSTC_LIBDIR="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1/lib" RUSTC_LINK_STD_INTO_RUSTC_DRIVER="1" RUSTC_LINT_FLAGS="" RUSTC_REAL="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" RUSTC_SNAPSHOT="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" RUSTC_SNAPSHOT_LIBDIR="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1/lib" RUSTC_STAGE="1" RUSTC_SYSROOT="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1" RUSTC_TLS_MODEL_INITIAL_EXEC="1" RUSTC_VERBOSE="2" RUSTC_WRAPPER="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/bootstrap/debug/rustc" RUSTDOC="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/bootstrap/debug/rustdoc" RUSTDOCFLAGS="--cfg=windows_raw_dylib -Csymbol-mangling-version=v0 -Zunstable-options --check-cfg=cfg(bootstrap) --check-cfg=cfg(llvm_enzyme) --check-cfg=cfg(rust_analyzer) --crate-version 1.87.0\t(17067e9ac\t2025-05-09)\t(gentoo) -Clinker=x86_64-pc-linux-gnu-gcc" RUSTDOC_REAL="/path/to/nowhere/rustdoc/not/required" RUSTFLAGS="--cfg=windows_raw_dylib -Csymbol-mangling-version=v0 -Zunstable-options --check-cfg=cfg(bootstrap) --check-cfg=cfg(llvm_enzyme) --check-cfg=cfg(rust_analyzer) -Zmacro-backtrace -Csplit-debuginfo=off -Clink-arg=-L/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/llvm/lib\n -Clink-args=-Wl,-z,origin -Clink-args=-Wl,-rpath,$ORIGIN/../lib -Alinker-messages -Zunstable-options" RUST_TEST_THREADS="12" SYSROOT="/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1" __CARGO_DEFAULT_LIB_METADATA="stabletool-rustc1.87.0" "/opt/rust-bin-1.87.0/bin/cargo" "build" "--target" "x86_64-unknown-linux-gnu" "-Zbinary-dep-depinfo" "-j" "12" "-Zroot-dir=/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src" "-v" "-v" "--locked" "--frozen" "--release" "--manifest-path" "/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/src/tools/cargo/Cargo.toml" "--message-format" "json-render-diagnostics"
   0.937364912s  INFO prepare_target{force=false package_id=cargo v0.88.0 (/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/src/tools/cargo) target="cargo"}: cargo::core::compiler::fingerprint: fingerprint error for cargo v0.88.0 (/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/src/tools/cargo)/Build/TargetInner { ..: lib_target("cargo", ["lib"], "/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/src/tools/cargo/src/cargo/lib.rs", Edition2021) }
   0.937399236s  INFO prepare_target{force=false package_id=cargo v0.88.0 (/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/src/tools/cargo) target="cargo"}: cargo::core::compiler::fingerprint:     err: failed to read `/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-linux-gnu/release/.fingerprint/cargo-e76ec3984f005de7/lib-cargo`

Caused by:
    No such file or directory (os error 2)

Stack backtrace:
   0: cargo_util::paths::read_bytes
   1: cargo_util::paths::read
   2: cargo::core::compiler::fingerprint::_compare_old_fingerprint
   3: cargo::core::compiler::fingerprint::prepare_target
   4: cargo::core::compiler::compile
   5: <cargo::core::compiler::build_runner::BuildRunner>::compile
   6: cargo::ops::cargo_compile::compile_ws
   7: cargo::ops::cargo_compile::compile_with_exec
   8: cargo::ops::cargo_compile::compile
   9: cargo::commands::build::exec
  10: <cargo::cli::Exec>::exec
  11: cargo::main
  12: std::sys::backtrace::__rust_begin_short_backtrace::<fn(), ()>
  13: std::rt::lang_start::<()>::{closure#0}
  14: core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/core/src/ops/function.rs:284:13
  15: std::panicking::try::do_call
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:589:40
  16: std::panicking::try
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:552:19
  17: std::panic::catch_unwind
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panic.rs:359:14
  18: std::rt::lang_start_internal::{{closure}}
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/rt.rs:168:24
  19: std::panicking::try::do_call
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:589:40
  20: std::panicking::try
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panicking.rs:552:19
  21: std::panic::catch_unwind
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/panic.rs:359:14
  22: std::rt::lang_start_internal
             at /rustc/17067e9ac6d7ecb70e50f92c1944e545188d2359/library/std/src/rt.rs:164:5
  23: main
  24: <unknown>
  25: __libc_start_main
  26: <unknown>
   0.947389055s  INFO prepare_target{force=false package_id=annotate-snippets v0.11.5 target="annotate_snippets"}: cargo::core::compiler::fingerprint: fingerprint error for annotate-snippets v0.11.5/Build/TargetInner { ..: lib_target("annotate_snippets", ["lib"], "/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/vendor/annotate-snippets-0.11.5/src/lib.rs", Edition2021) }
   0.947405707s  INFO prepare_target{force=false package_id=annotate-snippets v0.11.5 target="annotate_snippets"}: cargo::core::compiler::fingerprint:     err: failed to read `/var/tmp/portage/dev-lang/rust-1.87.0-r1/work/rustc-1.87.0-src/build/x86_64-unknown-linux-gnu/stage1-tools/x86_64-unknown-linux-gnu/release/.fingerprint/annotate-snippets-934e2959e138ba35/lib-annotate_snippets`

I'm using rust-1.87.0 to build my local copy:

rustc --version --verbose:

rustc 1.87.0 (17067e9ac 2025-05-09) (gentoo)
binary: rustc
commit-hash: 17067e9ac6d7ecb70e50f92c1944e545188d2359
commit-date: 2025-05-09
host: x86_64-unknown-linux-gnu
release: 1.87.0
LLVM version: 20.1.1

these errors are recoverable - they still allow the build to finish. but since there are so many of them I wanted to ask if there is a real bug here?

[stefson]

here is the verbose log of all of these errors: rust-log.gz

[stefson]

this is my config.toml:

profile = "dist"
[llvm]
download-ci-llvm = false
optimize = true
release-debuginfo = false
assertions = false
ninja = true
targets = "AArch64;X86;ARM;WebAssembly"
experimental-targets = ""
link-shared = false


enable-warnings = false
[llvm.build-config]
CMAKE_VERBOSE_MAKEFILE = "ON"
CMAKE_C_FLAGS_RELEASE = "-O2 -march=znver1 -pipe"
CMAKE_CXX_FLAGS_RELEASE = "-O2 -march=znver1 -pipe"
CMAKE_EXE_LINKER_FLAGS_RELEASE = "-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs"
CMAKE_MODULE_LINKER_FLAGS_RELEASE = "-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs"
CMAKE_SHARED_LINKER_FLAGS_RELEASE = "-Wl,-O1 -Wl,--as-needed -Wl,-z,pack-relative-relocs"
CMAKE_STATIC_LINKER_FLAGS_RELEASE = ""
[build]
build-stage = 2
test-stage = 2
build = "x86_64-unknown-linux-gnu"
host = ["x86_64-unknown-linux-gnu"]
target = ["x86_64-unknown-linux-gnu","armv7-unknown-linux-gnueabihf","thumbv7neon-unknown-linux-gnueabihf","aarch64-unknown-linux-gnu"]
cargo = "/usr/lib/rust/1.87.0/bin/cargo"
rustc = "/usr/lib/rust/1.87.0/bin/rustc"
rustfmt = "/usr/lib/rust/1.87.0/bin/rustfmt"
docs = false
compiler-docs = false
submodules = false
python = "python3.13"
locked-deps = true
vendor = true
extended = true
tools = ["cargo","rustdoc"]
verbose = 2
sanitizers = false
profiler = true
cargo-native-static = false
[install]
prefix = "/usr/lib/rust/1.87.0"
sysconfdir = "etc"
docdir = "share/doc/rust"
bindir = "bin"
libdir = "lib"
mandir = "share/man"
[rust]
codegen-units-std = 1
optimize = true
debug = false
debug-assertions = false
debug-assertions-std = false
debuginfo-level = 0
debuginfo-level-rustc = 0
debuginfo-level-std = 0
debuginfo-level-tools = 0
debuginfo-level-tests = 0
backtrace = true
incremental = false
default-linker = "x86_64-pc-linux-gnu-cc"
channel = "stable"
description = "gentoo"
rpath = true
verbose-tests = true
optimize-tests = true
codegen-tests = true
dist-src = false
remap-debuginfo = true
lld = false

deny-warnings = true
backtrace-on-ice = true
jemalloc = false
lto = "off"
[dist]
src-tarball = false
compression-formats = ["xz"]
compression-profile = "balanced"
[target.x86_64-unknown-linux-gnu]
ar = "x86_64-pc-linux-gnu-ar"
cc = "x86_64-pc-linux-gnu-gcc"
cxx = "x86_64-pc-linux-gnu-g++"
linker = "x86_64-pc-linux-gnu-gcc"
ranlib = "x86_64-pc-linux-gnu-ranlib"
llvm-libunwind = "no"
[target.armv7-unknown-linux-gnueabihf]
ar = "armv7a-unknown-linux-gnueabihf-ar"
cc = "armv7a-unknown-linux-gnueabihf-gcc"
cxx = "armv7a-unknown-linux-gnueabihf-g++"
linker = "armv7a-unknown-linux-gnueabihf-gcc"
ranlib = "armv7a-unknown-linux-gnueabihf-ranlib"
[target.thumbv7neon-unknown-linux-gnueabihf]
ar = "armv7a-unknown-linux-gnueabihf-ar"
cc = "armv7a-unknown-linux-gnueabihf-gcc"
cxx = "armv7a-unknown-linux-gnueabihf-g++"
linker = "armv7a-unknown-linux-gnueabihf-gcc"
ranlib = "armv7a-unknown-linux-gnueabihf-ranlib"
[target.aarch64-unknown-linux-gnu]
ar = "aarch64-unknown-linux-gnu-ar"
cc = "aarch64-unknown-linux-gnu-gcc"
cxx = "aarch64-unknown-linux-gnu-g++"
linker = "aarch64-unknown-linux-gnu-gcc"
ranlib = "aarch64-unknown-linux-gnu-ranlib"

[bjorn3]

These are expected when building from scratch. It basically means that no previous version was found for a crate that needs to be compiled. Cargo normally doesn't show these debug logs, but they do show for you because you did a verbose build and the rust build system enables these logs in verbose mode. You shouldn't need to use verbose mode unless you are trying to debug an issue with the build system. In non-verbose mode, the build system is already fairly verbose in showing you what it does. It just doesn't show the why it does these things.

[workingjubilee]

Closing since any bug here is "I enabled verbose mode and I got an extremely chatty squawking parrot of a build system" which... yeah, Rust tooling tends to be chatty by default so verbose is asking for A Lot.