error: detected panic in function `remainderf

[tesuji]

Run this with commit f43bc0d.

% cargo test --features musl-reference-tests --release
   Compiling libm v0.2.0 (/home/lzutao/forked/rust/libm)
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.0.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.1.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.10.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.11.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.12.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.13.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.14.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.15.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.2.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.3.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.4.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.5.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.6.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.7.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.8.rcgu.o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.9.rcgu.o" "-o" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c" "/home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.5adakcrby8h8x6n2.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-Wl,-O1" "-nodefaultlibs" "-L" "/home/lzutao/forked/rust/libm/target/release/deps" "-L" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-d11f8223c43b0c21.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-f90d531ee174a894.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-bab2c97e0ec4c812.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunicode_width-0207b1dba79a86b9.rlib" "-Wl,--start-group" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-623a6dc23f9cb558.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-862860ba17d4a376.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-84d204dc20d28a21.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-d7f4a94756d90f61.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-74425e3f3d79d417.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-6ea6570cade36603.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-cd8fc47e9b83cca0.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-58ae00f8c1022396.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-dbc21f93cc0a5b29.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-04b52238d74659b4.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-d00e044b91e465a0.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-4fd884ff5e34b6c0.rlib" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-437fd3003e58c8ca.rlib" "-Wl,--end-group" "/home/lzutao/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-78f8338ee0fc4c22.rlib" "-Wl,-Bdynamic" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
  = note: ld: error: undefined symbol:

          ERROR[no-panic]: detected panic in function `remainder`

          >>> referenced by libm.30ixsbme-cgu.0
          >>>               /home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.0.rcgu.o:(core::ptr::real_drop_in_place::h63dda0366f3d81af)

          ld: error: undefined symbol:

          ERROR[no-panic]: detected panic in function `remainderf`

          >>> referenced by libm.30ixsbme-cgu.0
          >>>               /home/lzutao/forked/rust/libm/target/release/deps/libm-63fa142dcce8af2c.libm.30ixsbme-cgu.0.rcgu.o:(core::ptr::real_drop_in_place::h9cd79ae393dd6d08)
          clang-9: error: linker command failed with exit code 1 (use -v to see invocation)


error: aborting due to previous error

error: Could not compile `libm`.

To learn more, run the command again with --verbose.

[Schultzer]

Can you please provide some information about your system?

[tesuji]

Some info about my system:

% uname -a
Linux gcc122.bak.milne.osuosl.org 4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u2 (2019-05-13) x86_64 GNU/Linux
% cc --version
clang version 9.0.0 (https://github.com/llvm/llvm-project.git 1094e6a81430e76f0a6b836f52fa6e21726f5e6d)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/lzutao/.local/bin
% rustc -Vv
rustc 1.38.0-nightly (481068a70 2019-07-05)
binary: rustc
commit-hash: 481068a707679257e2a738b40987246e0420e787
commit-date: 2019-07-05
host: x86_64-unknown-linux-gnu
release: 1.38.0-nightly
LLVM version: 8.0

[gnzlbg]

The problem is that remquo is not no_panic: https://github.com/rust-lang-nursery/libm/blob/master/src/math/remquo.rs#L1

Apparently, remquo might panic for some reason. #198 fixes that (by making it no_panic and `extern "C"), but I haven't observed this error there.

Can you try making remquo no_panic in your system, and seeing if you can nail down the error ?

[tesuji]

Yay! It worked!