Regression: "rust-lld: error: undefined symbol: Rlog1p"

[theemathas]

[INFO] [stdout] error: linking with `cc` failed: exit status: 1
[INFO] [stdout]   |
[INFO] [stdout]   = note:  "cc" "-m64" "/tmp/rustcIawPNl/symbols.o" "<2 object files omitted>" "-Wl,--as-needed" "-Wl,-Bstatic" "/opt/rustwide/target/debug/deps/{liblibr-fb1f28c02835dd25,liblibc-21c65d3cecbb2f0e}.rlib" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib/{libstd-*,libpanic_unwind-*,libobject-*,libmemchr-*,libaddr2line-*,libgimli-*,libcfg_if-*,librustc_demangle-*,libstd_detect-*,libhashbrown-*,librustc_std_workspace_alloc-*,libminiz_oxide-*,libadler2-*,libunwind-*,liblibc-*,librustc_std_workspace_core-*,liballoc-*,libcore-*,libcompiler_builtins-*}.rlib" "-Wl,-Bdynamic" "-lR" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/tmp/rustcIawPNl/raw-dylibs" "-B<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/usr/lib/R/lib" "-L" "<sysroot>/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/opt/rustwide/target/debug/examples/01_embedded_print-fd7c93e7d624e282" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs" "-Wl,--export-dynamic" "-Wl,-Bsymbolic-functions" "-Wl,-z,relro"
[INFO] [stdout]   = note: some arguments are omitted. use `--verbose` to show all linker arguments
[INFO] [stdout]   = note: rust-lld: error: undefined symbol: Rlog1p
[INFO] [stdout]           >>> referenced by math.rs:56 (src/math.rs:56)
[INFO] [stdout]           >>>               libr-fb1f28c02835dd25.libr.afc42f30ce0bac2d-cgu.0.rcgu.o:(libr::math::log1p::hf26b7710c6b32ad0) in archive /opt/rustwide/target/debug/deps/liblibr-fb1f28c02835dd25.rlib
[INFO] [stdout]           collect2: error: ld returned 1 exit status

https://crater-reports.s3.amazonaws.com/beta-1.93-4/beta-2025-12-22/reg/libr-0.1.0/log.txt

[Noratrieb]

This crate is doing very strange things. Their build.rs is

fn main() {
    match pkg_config::find_library("libR") {
        Ok(..) => return,
        Err(e) => panic!("Couldn't find libR from pkgconfig ({:?}), failed", e),
    }
}

Which, notably, only probes for the libraries existence, which doesn't actually link it.
They do link it via #[link(name = "R")] in the source though.

I cannot reproduce this error locally in a Debian 12 container. It builds fine for me when I have pkg-config and R (pkgs r-base r-base-dev) installed. It errors in the build.rs when either pkg-config or R are missing.
I ran cargo test --no-run like crater.

My linker commandline was

LC_ALL="C" PATH="/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin:/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/self-contained:/root/.cargo/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" VSLANG="1033" "cc" "-m64" "/meow/target/debug/examples/rustcr56c81/symbols.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.0v8lo7ocme7p3s2fiwlfan00t.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.18qa3rfugbd7s92x674dslkzr.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.2rqx3bp8h50g5e3wpvptkv9nx.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.3betu7xj29i0s59jdiw36irip.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.3jd6ssnw3og0zrfa9i7atv3by.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.4s2gtg8udd04mt6yp27x7tl87.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.4uih0j9srypwn6ns0lq5nsj21.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.4yvpff3qhrl2ougrehxcelopt.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.5dz3qc8vty0ydtgk4fpg9h4eh.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.5u5y9ik5a5jul8vxscqx0xrd6.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.7uimg4jlrdidf6wivjdolh8ok.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.8idhrwt7aqj962zvnrbh3wluw.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.95xzej87zi3v41alcci4azq12.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.9iqa9vyoukohldrio7j3gxyw8.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.brqlpu8z76dqse4rp3mppsryk.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.c7zpw04dls435uirdid2y86mi.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.epm9rr6ybiy2872aqn31ovctw.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.eryvufw87ou6un0hc72e4pr1e.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.ewdbb8nf1s53gwf3f0zjax13x.0c804xx.rcgu.o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f.7dc0uhmiyuyf6yf1020q2wc01.0c804xx.rcgu.o" "-Wl,--as-needed" "-Wl,-Bstatic" "/meow/target/debug/deps/liblibr-4a9661f1fd3cfc3c.rlib" "/meow/target/debug/deps/liblibc-0bf3dea0d5dbfef6.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-ad248a6e6fe48fd9.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-c648d4fae29b59eb.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libobject-746fcf4e6945e844.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libmemchr-1a4ac7a89d135114.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libaddr2line-8c9eefd80a8a6655.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgimli-8a6df0673106affc.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-4ae19dac63760b32.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-bd991e9d58f00c67.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_detect-09b987df3514c18d.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-093e2dcc3b79b78f.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-f82d6ff939dd0c22.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libminiz_oxide-ec6104bef921e5e8.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libadler2-22f8aa70ac4596a8.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-3a784e481f6f3a6b.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-c965931b11617a7d.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-382246745f6dde59.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-e2ad2c5894b6a0dd.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-78f4b20a6083cd0a.rlib" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-7763dbcaa86b3b00.rlib" "-Wl,-Bdynamic" "-lR" "-lgcc_s" "-lutil" "-lrt" "-lpthread" "-lm" "-ldl" "-lc" "-L" "/meow/target/debug/examples/rustcr56c81/raw-dylibs" "-B/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/bin/gcc-ld" "-fuse-ld=lld" "-Wl,--eh-frame-hdr" "-Wl,-z,noexecstack" "-L" "/usr/lib/R/lib" "-L" "/root/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-o" "/meow/target/debug/examples/02_embedded_named_call-04b916c374bba19f" "-Wl,--gc-sections" "-pie" "-Wl,-z,relro,-z,now" "-nodefaultlibs" "-Wl,--export-dynamic" "-Wl,-z,relro"

Which contains the important -lR that links in R. The crater linker command from the error also contains it.
I suspect that there's something strange going on with the crater env. It should have R installed https://github.com/rust-lang/crates-build-env/blob/9fbffe614e1a811d77ea91d65efaae306b0ba8ac/linux/packages.txt#L1088.

[apiraino]

Unsure why we have this crate in our testsuite (or why was it included at the time) 🤔

[Noratrieb]

The entire point of crater is to test all the crates :P

[apiraino]

I cannot reproduce the issue as well (with the correct setup, as you point out) both on stable and beta. If these dependencies are a requirement as they always were, then I'm curious why the crater fails (runs cargo test). Or if this is a new situation.