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Some functions result in dynamically linked binaries with +crt-static on non-x86 linux gnu #2033

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Jakob-Naucke opened this issue Jan 13, 2021 · 2 comments · Fixed by #2046
Closed

Some functions result in dynamically linked binaries with +crt-static on non-x86 linux gnu #2033

Jakob-Naucke opened this issue Jan 13, 2021 · 2 comments · Fixed by #2046
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C-bug Category: bug

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@Jakob-Naucke
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Jakob-Naucke commented Jan 13, 2021 •
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Building e.g. this

use libc;
use std::{mem,ptr};
fn main() {
    let mut primary = mem::MaybeUninit::<libc::c_int>::uninit();
    let mut secondary = mem::MaybeUninit::<libc::c_int>::uninit();
    unsafe {
        libc::openpty(
            primary.as_mut_ptr(),
            secondary.as_mut_ptr(),
            ptr::null_mut(),
            ptr::null_mut(),
            ptr::null_mut()
        );
    }
}

(adapted from nix) with -C target-feature=+crt-static on s390x-unknown-linux-gnu yields a binary that still has some .so dependencies:

$ ldd target/debug/test
        linux-vdso64.so.1 (0x000003ff9f7fe000)
        libutil.so.1 => /lib/s390x-linux-gnu/libutil.so.1 (0x000003ff9f680000)
        libc.so.6 => /lib/s390x-linux-gnu/libc.so.6 (0x000003ff9f480000)
        /lib/ld64.so.1 (0x000003ff9f780000)

This was also reproducible (all linux-gnu)

  • on ppc64le
  • on aarch64
  • with forkpty instead

but not reproducible

  • on x86_64
  • with some other unsafe functions such as time
Very verbose output with `-Z print-link-args` 

   Compiling libc v0.2.82
     Running `CARGO=/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/bin/cargo CARGO_CRATE_NAME=build_script_build CARGO_MANIFEST_DIR=/home/ubuntu/.cargo/registry/src/git.luolix.top-eae4ba8cbf2ce1c7/libc-0.2.82 CARGO_PKG_AUTHORS='The Rust Project Developers' CARGO_PKG_DESCRIPTION='Raw FFI bindings to platform libraries like libc.
' CARGO_PKG_HOMEPAGE='https://github.com/rust-lang/libc' CARGO_PKG_LICENSE='MIT OR Apache-2.0' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=libc CARGO_PKG_REPOSITORY='https://github.com/rust-lang/libc' CARGO_PKG_VERSION=0.2.82 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=2 CARGO_PKG_VERSION_PATCH=82 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/home/ubuntu/test-static/target/debug/deps:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/usr/lib64' rustc --crate-name build_script_build /home/ubuntu/.cargo/registry/src/git.luolix.top-eae4ba8cbf2ce1c7/libc-0.2.82/build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=09cbcd591eae9ba1 -C extra-filename=-09cbcd591eae9ba1 --out-dir /home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1 -L dependency=/home/ubuntu/test-static/target/debug/deps --cap-lints warn -C target-feature=+crt-static -Z print-link-args`
"cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-Wl,--eh-frame-hdr" "-L" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.0.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.1.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.10.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.11.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.12.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.13.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.14.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.15.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.2.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.3.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.4.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.5.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.6.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.7.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.8.rcgu.o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.build_script_build.5fa6zfcy-cgu.9.rcgu.o" "-o" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1" "/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build_script_build-09cbcd591eae9ba1.2c0x1qbnibhk5cn.rcgu.o" "-Wl,--gc-sections" "-static" "-no-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/ubuntu/test-static/target/debug/deps" "-L" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libstd-50f7c55511b11716.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libpanic_unwind-6b06374750fe5024.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libminiz_oxide-fabc4d4dd11ea3a8.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libadler-1397a5d023aaea88.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libobject-ab1bf02644328503.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libaddr2line-a0f14a96e3061bf5.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libgimli-7ef43e4b423d0eb6.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_demangle-2187c3d66bd703f9.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libhashbrown-3f4201b41a6c7558.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_std_workspace_alloc-8bd33c3b7aae2168.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libunwind-d1b4b1683acb236b.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcfg_if-c545463366acaedf.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/liblibc-caec2c67e026c6e3.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/liballoc-28a6b62567f5a962.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_std_workspace_core-d04d6d043c6dc122.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcore-2e6f58b9f207495c.rlib" "-Wl,--end-group" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcompiler_builtins-9f6cdbe065d300eb.rlib" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-lgcc_eh" "-lgcc" "-Wl,-Bdynamic" "-lutil"
     Running `/home/ubuntu/test-static/target/debug/build/libc-09cbcd591eae9ba1/build-script-build`
[libc 0.2.82] cargo:rustc-cfg=freebsd11
[libc 0.2.82] cargo:rustc-cfg=libc_priv_mod_use
[libc 0.2.82] cargo:rustc-cfg=libc_union
[libc 0.2.82] cargo:rustc-cfg=libc_const_size_of
[libc 0.2.82] cargo:rustc-cfg=libc_align
[libc 0.2.82] cargo:rustc-cfg=libc_core_cvoid
[libc 0.2.82] cargo:rustc-cfg=libc_packedN
[libc 0.2.82] cargo:rustc-cfg=libc_cfg_target_vendor
     Running `CARGO=/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/bin/cargo CARGO_CRATE_NAME=libc CARGO_MANIFEST_DIR=/home/ubuntu/.cargo/registry/src/git.luolix.top-eae4ba8cbf2ce1c7/libc-0.2.82 CARGO_PKG_AUTHORS='The Rust Project Developers' CARGO_PKG_DESCRIPTION='Raw FFI bindings to platform libraries like libc.
' CARGO_PKG_HOMEPAGE='https://github.com/rust-lang/libc' CARGO_PKG_LICENSE='MIT OR Apache-2.0' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=libc CARGO_PKG_REPOSITORY='https://github.com/rust-lang/libc' CARGO_PKG_VERSION=0.2.82 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=2 CARGO_PKG_VERSION_PATCH=82 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/home/ubuntu/test-static/target/debug/deps:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/usr/lib64' OUT_DIR=/home/ubuntu/test-static/target/debug/build/libc-a6afc93cde3408db/out rustc --crate-name libc /home/ubuntu/.cargo/registry/src/git.luolix.top-eae4ba8cbf2ce1c7/libc-0.2.82/src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C embed-bitcode=no -C debuginfo=2 --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=ff0e3c5579e7cbbc -C extra-filename=-ff0e3c5579e7cbbc --out-dir /home/ubuntu/test-static/target/debug/deps -L dependency=/home/ubuntu/test-static/target/debug/deps --cap-lints warn -C target-feature=+crt-static -Z print-link-args --cfg freebsd11 --cfg libc_priv_mod_use --cfg libc_union --cfg libc_const_size_of --cfg libc_align --cfg libc_core_cvoid --cfg libc_packedN --cfg libc_cfg_target_vendor`
   Compiling test v0.0.1 (/home/ubuntu/test-static)
     Running `CARGO=/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/bin/cargo CARGO_BIN_NAME=test CARGO_CRATE_NAME=test CARGO_MANIFEST_DIR=/home/ubuntu/test-static CARGO_PKG_AUTHORS='' CARGO_PKG_DESCRIPTION='' CARGO_PKG_HOMEPAGE='' CARGO_PKG_LICENSE='' CARGO_PKG_LICENSE_FILE='' CARGO_PKG_NAME=test CARGO_PKG_REPOSITORY='' CARGO_PKG_VERSION=0.0.1 CARGO_PKG_VERSION_MAJOR=0 CARGO_PKG_VERSION_MINOR=0 CARGO_PKG_VERSION_PATCH=1 CARGO_PKG_VERSION_PRE='' LD_LIBRARY_PATH='/home/ubuntu/test-static/target/debug/deps:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib:/usr/lib64' rustc --crate-name test --edition=2018 src/main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C embed-bitcode=no -C debuginfo=2 -C metadata=8a1ea7ba351cd7e9 -C extra-filename=-8a1ea7ba351cd7e9 --out-dir /home/ubuntu/test-static/target/debug/deps -C incremental=/home/ubuntu/test-static/target/debug/incremental -L dependency=/home/ubuntu/test-static/target/debug/deps --extern libc=/home/ubuntu/test-static/target/debug/deps/liblibc-ff0e3c5579e7cbbc.rlib -C target-feature=+crt-static -Z print-link-args`
"cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-Wl,--eh-frame-hdr" "-L" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.1vri1zmzot0pzy5g.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.1w8grodbox6fegxa.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.3n1ha6ym3wlbmht5.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.46czccayvrskbsry.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.4zb5nwtixcrrg1ug.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.8bjz1dv9t5o8s4.rcgu.o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.dnmz56754fvdl4r.rcgu.o" "-o" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9" "/home/ubuntu/test-static/target/debug/deps/test-8a1ea7ba351cd7e9.foqfbn68vp8xjlg.rcgu.o" "-Wl,--gc-sections" "-static" "-no-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/ubuntu/test-static/target/debug/deps" "-L" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/ubuntu/test-static/target/debug/deps/liblibc-ff0e3c5579e7cbbc.rlib" "-Wl,--start-group" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libstd-50f7c55511b11716.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libpanic_unwind-6b06374750fe5024.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libminiz_oxide-fabc4d4dd11ea3a8.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libadler-1397a5d023aaea88.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libobject-ab1bf02644328503.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libaddr2line-a0f14a96e3061bf5.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libgimli-7ef43e4b423d0eb6.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_demangle-2187c3d66bd703f9.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libhashbrown-3f4201b41a6c7558.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_std_workspace_alloc-8bd33c3b7aae2168.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libunwind-d1b4b1683acb236b.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcfg_if-c545463366acaedf.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/liblibc-caec2c67e026c6e3.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/liballoc-28a6b62567f5a962.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/librustc_std_workspace_core-d04d6d043c6dc122.rlib" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcore-2e6f58b9f207495c.rlib" "-Wl,--end-group" "/home/ubuntu/.rustup/toolchains/nightly-2020-10-08-s390x-unknown-linux-gnu/lib/rustlib/s390x-unknown-linux-gnu/lib/libcompiler_builtins-9f6cdbe065d300eb.rlib" "-Wl,-Bdynamic" "-lutil" "-Wl,-Bstatic" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-lgcc_eh" "-lgcc" "-Wl,-Bdynamic" "-lutil"
    Finished dev [unoptimized + debuginfo] target(s) in 1.55s

A fully statically linked binary can also be produced e.g. on s390x by removing this line from libc, reproducible on ppc64le (with ppc64le's respective file).

#[link(name = "util")]

Are these link directives necessary?

/cc @fidencio kata-containers/kata-containers#1239
@Jakob-Naucke Jakob-Naucke added the C-bug Category: bug label Jan 13, 2021
@Jakob-Naucke Jakob-Naucke mentioned this issue Jan 15, 2021
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@JohnTitor
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cc @joshtriplett

@joshtriplett
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Good catch. No, those link directives should not be there. #2046 should fix static linking for all linux-gnu targets.

@JohnTitor JohnTitor mentioned this issue Jan 28, 2021
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@Jakob-Naucke Jakob-Naucke mentioned this issue Feb 5, 2021
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Remove link directives for libutil on linux-gnu targets joshtriplett/rust-libc
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@joshtriplett @JohnTitor @Jakob-Naucke