unable to find Static system library 'gcc_eh'

[serjflint]

Hi! I am trying to cross-compile Ruff from Linux to Linux-ARM (aarch64-unknown-linux-gnu). At the linking stage with command

TARGET=aarch64-unknown-linux-gnu
PKG_CONFIG_ALLOW_CROSS=1 cargo zigbuild --release --target=$TARGET --verbose

I get an error

error: linking with `/home/sandbox/.cache/cargo-zigbuild/0.17.3/zigcc-aarch64-unknown-linux-gnu.sh` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/tmp/cargo/bin:/opt/zig:/usr/local/cargo/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/Berkanavt/bin/scripts" VSLANG="1033" "/home/sandbox/.cache/cargo-zigbuild/0.17.3/zigcc-aarch64-unknown-linux-gnu.sh" "/tmp/rustcGyi8cX/symbols.o" "/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/ruff_python_formatter-d5103041bb61df09.ruff_python_formatter.28e285a93788288c-cgu.0.rcgu.o" "-Wl,--as-needed" "-L" "/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps" "-L" "/place/rust/contrib/ruff/target/release/deps" "-L" "/usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-lgcc_eh" "-lgcc" "-lc" "/usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib/libcompiler_builtins-e98df64cadd875cc.rlib" "-Wl,-Bdynamic" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib" "-o" "/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/ruff_python_formatter-d5103041bb61df09" "-Wl,--gc-sections" "-static" "-no-pie" "-Wl,-z,relro,-z,now" "-Wl,-O1" "-nodefaultlibs" "-undefined" "dynamic_lookup"
  = note: error: unable to find Static system library 'gcc_eh' using strategy 'no_fallback'. searched paths:
            /place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libgcc_eh.a
            /place/rust/contrib/ruff/target/release/deps/libgcc_eh.a
            /usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib/libgcc_eh.a
            /usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib/libgcc_eh.a
          error: unable to find Static system library 'gcc' using strategy 'no_fallback'. searched paths:
            /place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libgcc.a
            /place/rust/contrib/ruff/target/release/deps/libgcc.a
            /usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib/libgcc.a
            /usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/lib/rustlib/aarch64-unknown-linux-gnu/lib/libgcc.a
          

error: could not compile `ruff_python_formatter` (bin "ruff_python_formatter") due to previous error

Caused by:
  process didn't exit successfully: `/usr/local/rustup/toolchains/1.72-x86_64-unknown-linux-gnu/bin/rustc --crate-name ruff_python_formatter --edition=2021 crates/ruff_python_formatter/src/main.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --crate-type bin --emit=dep-info,link -C opt-level=3 -C lto=fat -C codegen-units=1 --cfg 'feature="default"' --cfg 'feature="serde"' -C metadata=d5103041bb61df09 -C extra-filename=-d5103041bb61df09 --out-dir /place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps --target aarch64-unknown-linux-gnu -C linker=/home/sandbox/.cache/cargo-zigbuild/0.17.3/zigcc-aarch64-unknown-linux-gnu.sh -L dependency=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps -L dependency=/place/rust/contrib/ruff/target/release/deps --extern anyhow=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libanyhow-d773c4b449ba7692.rlib --extern bitflags=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libbitflags-00cbddb37865de95.rlib --extern clap=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libclap-c3150b07e1bd02d0.rlib --extern countme=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libcountme-66bb619c24c71fb6.rlib --extern itertools=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libitertools-1327eb584da2ff46.rlib --extern memchr=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libmemchr-570a1c555cf2c156.rlib --extern once_cell=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libonce_cell-44bf3c56b546124e.rlib --extern ruff_formatter=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_formatter-afac7d90f3117771.rlib --extern ruff_python_ast=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_python_ast-61130ac81486df61.rlib --extern ruff_python_formatter=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_python_formatter-bafd76a0a46edff9.rlib --extern ruff_python_index=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_python_index-edb6a4afaa5026cc.rlib --extern ruff_python_parser=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_python_parser-f2abe69db5e13fb4.rlib --extern ruff_python_trivia=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_python_trivia-022058b197ec5c90.rlib --extern ruff_source_file=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_source_file-f8b3fa83166c3783.rlib --extern ruff_text_size=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libruff_text_size-0568ea01c8d42034.rlib --extern rustc_hash=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/librustc_hash-27719bb5f9f9bf70.rlib --extern serde=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libserde-0f4933fdf04b23e6.rlib --extern smallvec=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libsmallvec-6f1193bc99ed01c8.rlib --extern static_assertions=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libstatic_assertions-0ce627262f703e27.rlib --extern thiserror=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libthiserror-0544a68f0c99f803.rlib --extern tracing=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libtracing-bb3516bdceedb125.rlib --extern unicode_width=/place/rust/contrib/ruff/target/aarch64-unknown-linux-gnu/release/deps/libunicode_width-c435dab1e04893bc.rlib -C target-feature=+crt-static -C link-arg=-undefined -C link-arg=dynamic_lookup` (exit status: 1)

I have the next flags:

export PYO3_PYTHON=/usr/bin/python3.11
export PYO3_CROSS_LIB_DIR=/usr/lib/python3.11
export PYO3_CROSS_PYTHON_VERSION=3.11

And config.toml

[target.aarch64-unknown-linux-gnu]
linker = "clang"
rustflags = [
  "-C", "target-feature=+crt-static",
  "-C", "link-arg=-undefined",
  "-C", "link-arg=dynamic_lookup",
]

[messense]

First of all, Ruff is a pure Rust binary at the moment so there is no need to set PYO3_* env vars. And -undefined dynamic_lookup is a macOS/Darwin specific thing, you shouldn't need it for aarch64 Linux.

As for gcc_eh, you may need to ask ziglang/zig for help.

[polarathene]

Reference issue: #231

Doesn't appear to be a Zig problem (although I haven't tried it directly with a hello world example). You can ignore the whole Ruff context, a simple cargo init generated hello world project will fail just the same.

I'm pretty sure this is related to what Rust does internally at build time, except cargo zigbuild differs from cargo build somehow when it comes to using RUSTFLAGS="-C target-feature=+crt-static with an explicit --target ....