linking with cc failed when using lto = fat #72268
Description
This bug can be reproduced only by using two crates, nothing else worked so far
A
├── B
│ ├── Cargo.toml
│ └── src
│ └── lib.rs
├── Cargo.toml
└── src
└── main.rs
A::Cargo.toml
[package]
name = "A"
version = "0.1.0"
[profile.dev]
lto = "fat"
[dependencies]
B = { path = "./B" }A::main.rs is empty (or just a plain fn main() {}, doesn't matter).
B::Cargo.toml
[package]
name = "B"
version = "0.1.0"
[lib]
crate_type = ["rlib", "cdylib"]B::src/lib.rs is empty as well (or any public function, doesn't matter as well)
When compiling this with cargo build, it errors:
error: linking with `cc` failed: exit code: 1
|
= note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-Wl,-plugin-opt=O0" "-Wl,-plugin-opt=mcpu=x86-64" "-L" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/tmp/tmp.DW07BccpbK/A/target/debug/deps/B.42q3kclfyl99cg7w.rcgu.o" "-o" "/tmp/tmp.DW07BccpbK/A/target/debug/deps/libB.so" "-Wl,--version-script=/tmp/rustcS2Vx8P/list" "/tmp/tmp.DW07BccpbK/A/target/debug/deps/B.4c2aglkwgm7gduii.rcgu.o" "-Wl,--gc-sections" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/tmp/tmp.DW07BccpbK/A/target/debug/deps" "-L" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,--start-group" "-Wl,-Bstatic" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-0126adaa107032a6.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-57961a3692c39401.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-9fa9e50746f44a4c.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-251012178f8196c3.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-cafd612ee1b4bf88.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-140b53dc81f0d53c.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-cbaa12f3d93cc54c.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-a5bcc2d112e5a391.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-5ada18586d2652e2.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-ac41f78688451395.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-b1966f66603f91b6.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-428d15b56101bdc7.rlib" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-941f7f6bc622e313.rlib" "-Wl,--end-group" "/home/marcel/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-e915d31ab7edbbd4.rlib" "-Wl,-Bdynamic" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-ldl" "-lutil" "-shared"
= note: /tmp/tmp.DW07BccpbK/A/target/debug/deps/B.42q3kclfyl99cg7w.rcgu.o: file not recognized: file format not recognized
collect2: error: ld returned 1 exit status
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rustc --version --verbose:
rustc 1.45.0-nightly (a74d1862d 2020-05-14)