Undefined floating point symbols on aarch64-unknown-uefi and i686-unknown-uefi

[radioactiveray]

I have the following code to reproduce the problem occured during the compilation or probably linking:

fn main() {
    let a: f32 = 1.5;
    let mut b: f32 = 2.5;
    let c = a % b;
    b %= c;
    println!("B: {}", b);
}

It is stored in an cargo package with the name "ex2"
I tried to compile this code for aarch64-unknown-uefi and i686-unknown-uefi but I got a linking error.
I could determine from the original error that it has something to do with the remainder operator % and %= and created the example code above!

So instead of successfully compiling and linking, linking fails, and this happened:
I got an linking error for both targets
for i686-unknown-uefi:

username@MacBook-Pro ex2 % cargo build --target i686-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/bin:/opt/homebrew/opt/llvm/bin:/Users/username/.bun/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/Cellar/llvm/16.0.6/bin:/opt/homebrew/opt/openssl@1.1/bin:/opt/homebrew/opt/ruby/bin:/Library/Frameworks/Python.framework/Versions/3.11/bin:/Library/Frameworks/Python.framework/Versions/3.10/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.9/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/X11/bin:/Library/Apple/usr/bin:/Users/username/.cargo/bin" VSLANG="1033" "rust-lld" "-flavor" "link" "/NOLOGO" "/entry:efi_main" "/subsystem:efi_application" "/var/folders/gv/wn3vglhn6c1_0t217lvltjwh0000gn/T/rustcgPkc1x/symbols.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.2nt2y5gpv4yt3xk3.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4jvc0vxvfvn11cal.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4nlvq803p7y312p6.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.tu3jsdgq3f563ck.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.vuuyty2xvpioi23.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.2jbqfwdd0tjpqxc8.rcgu.o" "/LIBPATH:/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps" "/LIBPATH:/Users/username/Downloads/ex2/target/debug/deps" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libstd-7e7eb2062a142a3e.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libpanic_abort-36055457cbe0f850.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libr_efi_alloc-64927457facf34ab.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libr_efi-2a1e98549a7a00a3.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_demangle-7e037608473db5f3.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libstd_detect-132d557b2a09b864.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libhashbrown-c715bed4850f7834.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_std_workspace_alloc-fbe0241b636787e7.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libminiz_oxide-6a445fca4be70af4.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libadler-84b1d06710df4508.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libunwind-82bbd58025dda93f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcfg_if-3ad873c706c6fc66.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/liblibc-78116445f3ae4a07.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/liballoc-d1446abb07db39d6.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_std_workspace_core-1a18fcda0162af1a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcore-f8a59c1f7ffdbc09.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcompiler_builtins-d8f60dd2696e72df.rlib" "/NXCOMPAT" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib" "/OUT:/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.efi" "/OPT:REF,NOICF" "/DEBUG" "/NODEFAULTLIB"
  = note: rust-lld: error: undefined symbol: _fmodf
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:5
          >>>               /Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o:(ex2::main::h0c0a4be9d6555d8f)
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:6
          >>>               /Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o:(ex2::main::h0c0a4be9d6555d8f)
          

error: could not compile `ex2` (bin "ex2") due to previous error

and the same happened for aarch64-unknown-uefi:

username@MacBook-Pro ex2 % cargo build --target aarch64-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/bin:/opt/homebrew/opt/llvm/bin:/Users/username/.bun/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/Cellar/llvm/16.0.6/bin:/opt/homebrew/opt/openssl@1.1/bin:/opt/homebrew/opt/ruby/bin:/Library/Frameworks/Python.framework/Versions/3.11/bin:/Library/Frameworks/Python.framework/Versions/3.10/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.9/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/X11/bin:/Library/Apple/usr/bin:/Users/username/.cargo/bin" VSLANG="1033" "rust-lld" "-flavor" "link" "/NOLOGO" "/entry:efi_main" "/subsystem:efi_application" "/machine:arm64" "/var/folders/gv/wn3vglhn6c1_0t217lvltjwh0000gn/T/rustcfvlUlB/symbols.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.3n5kea1bbzqv9exw.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.3s6as3gzpgkhm1lb.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.48zjmqduziw8znvq.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4n3zypb28wcsgae7.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.5bjc1y9grdkfp6vp.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.2e167e6ucqjwaehl.rcgu.o" "/LIBPATH:/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps" "/LIBPATH:/Users/username/Downloads/ex2/target/debug/deps" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libstd-045ee8b849b30216.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libpanic_abort-c732a680599a6eeb.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libr_efi_alloc-26d551f77507b9ac.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libr_efi-6f81a053f87c571f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_demangle-f6c09371e3a8b4dd.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libstd_detect-6ccc2cd4d08e2616.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libhashbrown-4795e194fbfd757a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_std_workspace_alloc-f20462b0ce198a27.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libminiz_oxide-700adc019a42334f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libadler-3d455cdb3342002c.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libunwind-0c051c2a79d70599.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcfg_if-e42d98bd1229a159.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/liblibc-adf453a07c32158a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/liballoc-bed710ebc6362cc8.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_std_workspace_core-007be4a60b9b0158.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcore-a87d1789f559fcdd.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcompiler_builtins-b22895ca42b8fa2f.rlib" "/NXCOMPAT" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib" "/OUT:/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.efi" "/OPT:REF,NOICF" "/DEBUG" "/NODEFAULTLIB"
  = note: rust-lld: error: undefined symbol: fmodf
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:5
          >>>               /Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o:(ex2::main::h6ceee2e1b3b2c246)
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:6
          >>>               /Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o:(ex2::main::h6ceee2e1b3b2c246)
          

error: could not compile `ex2` (bin "ex2") due to previous error

It works fine for x86_64-unknown-uefi but not for the other *-unknown-uefi targets
for x86_64-unknown-uefi:

username@MacBook-Pro ex2 % cargo build --target x86_64-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s

Meta

rustc --version --verbose:

rustc 1.74.0 (79e9716c9 2023-11-13)
binary: rustc
commit-hash: 79e9716c980570bfd1f666e3b16ac583f0168962
commit-date: 2023-11-13
host: aarch64-apple-darwin
release: 1.74.0
LLVM version: 17.0.4

Backtrace

username@MacBook-Pro src % RUST_BACKTRACE=1 cargo build --target x86_64-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
    Finished dev [unoptimized + debuginfo] target(s) in 0.70s
username@MacBook-Pro src % RUST_BACKTRACE=1 cargo build --target i686-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/bin:/opt/homebrew/opt/llvm/bin:/Users/username/.bun/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/Cellar/llvm/16.0.6/bin:/opt/homebrew/opt/openssl@1.1/bin:/opt/homebrew/opt/ruby/bin:/Library/Frameworks/Python.framework/Versions/3.11/bin:/Library/Frameworks/Python.framework/Versions/3.10/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.9/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/X11/bin:/Library/Apple/usr/bin:/Users/username/.cargo/bin" VSLANG="1033" "rust-lld" "-flavor" "link" "/NOLOGO" "/entry:efi_main" "/subsystem:efi_application" "/var/folders/gv/wn3vglhn6c1_0t217lvltjwh0000gn/T/rustcdM4lPN/symbols.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.2nt2y5gpv4yt3xk3.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4jvc0vxvfvn11cal.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4nlvq803p7y312p6.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.tu3jsdgq3f563ck.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.vuuyty2xvpioi23.rcgu.o" "/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.2jbqfwdd0tjpqxc8.rcgu.o" "/LIBPATH:/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps" "/LIBPATH:/Users/username/Downloads/ex2/target/debug/deps" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libstd-7e7eb2062a142a3e.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libpanic_abort-36055457cbe0f850.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libr_efi_alloc-64927457facf34ab.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libr_efi-2a1e98549a7a00a3.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_demangle-7e037608473db5f3.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libstd_detect-132d557b2a09b864.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libhashbrown-c715bed4850f7834.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_std_workspace_alloc-fbe0241b636787e7.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libminiz_oxide-6a445fca4be70af4.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libadler-84b1d06710df4508.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libunwind-82bbd58025dda93f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcfg_if-3ad873c706c6fc66.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/liblibc-78116445f3ae4a07.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/liballoc-d1446abb07db39d6.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/librustc_std_workspace_core-1a18fcda0162af1a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcore-f8a59c1f7ffdbc09.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib/libcompiler_builtins-d8f60dd2696e72df.rlib" "/NXCOMPAT" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/i686-unknown-uefi/lib" "/OUT:/Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.efi" "/OPT:REF,NOICF" "/DEBUG" "/NODEFAULTLIB"
  = note: rust-lld: error: undefined symbol: _fmodf
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:5
          >>>               /Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o:(ex2::main::h0c0a4be9d6555d8f)
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:6
          >>>               /Users/username/Downloads/ex2/target/i686-unknown-uefi/debug/deps/ex2-1b2e3615c92d76f1.4ezio3ls8fxbjkrl.rcgu.o:(ex2::main::h0c0a4be9d6555d8f)
          

error: could not compile `ex2` (bin "ex2") due to previous error
username@MacBook-Pro src % RUST_BACKTRACE=1 cargo build --target aarch64-unknown-uefi
   Compiling ex2 v0.1.0 (/Users/username/Downloads/ex2)
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: LC_ALL="C" PATH="/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-apple-darwin/bin:/opt/homebrew/opt/llvm/bin:/Users/username/.bun/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/icu4c/sbin:/opt/homebrew/opt/icu4c/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/opt/llvm/bin:/opt/homebrew/Cellar/llvm/16.0.6/bin:/opt/homebrew/opt/openssl@1.1/bin:/opt/homebrew/opt/ruby/bin:/Library/Frameworks/Python.framework/Versions/3.11/bin:/Library/Frameworks/Python.framework/Versions/3.10/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Library/Frameworks/Python.framework/Versions/3.9/bin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/opt/X11/bin:/Library/Apple/usr/bin:/Users/username/.cargo/bin" VSLANG="1033" "rust-lld" "-flavor" "link" "/NOLOGO" "/entry:efi_main" "/subsystem:efi_application" "/machine:arm64" "/var/folders/gv/wn3vglhn6c1_0t217lvltjwh0000gn/T/rustcGV3nJA/symbols.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.3n5kea1bbzqv9exw.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.3s6as3gzpgkhm1lb.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.48zjmqduziw8znvq.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4n3zypb28wcsgae7.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.5bjc1y9grdkfp6vp.rcgu.o" "/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.2e167e6ucqjwaehl.rcgu.o" "/LIBPATH:/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps" "/LIBPATH:/Users/username/Downloads/ex2/target/debug/deps" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libstd-045ee8b849b30216.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libpanic_abort-c732a680599a6eeb.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libr_efi_alloc-26d551f77507b9ac.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libr_efi-6f81a053f87c571f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_demangle-f6c09371e3a8b4dd.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libstd_detect-6ccc2cd4d08e2616.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libhashbrown-4795e194fbfd757a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_std_workspace_alloc-f20462b0ce198a27.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libminiz_oxide-700adc019a42334f.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libadler-3d455cdb3342002c.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libunwind-0c051c2a79d70599.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcfg_if-e42d98bd1229a159.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/liblibc-adf453a07c32158a.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/liballoc-bed710ebc6362cc8.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/librustc_std_workspace_core-007be4a60b9b0158.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcore-a87d1789f559fcdd.rlib" "/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib/libcompiler_builtins-b22895ca42b8fa2f.rlib" "/NXCOMPAT" "/LIBPATH:/Users/username/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/aarch64-unknown-uefi/lib" "/OUT:/Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.efi" "/OPT:REF,NOICF" "/DEBUG" "/NODEFAULTLIB"
  = note: rust-lld: error: undefined symbol: fmodf
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:5
          >>>               /Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o:(ex2::main::h6ceee2e1b3b2c246)
          >>> referenced by /Users/username/Downloads/ex2/src/main.rs:6
          >>>               /Users/username/Downloads/ex2/target/aarch64-unknown-uefi/debug/deps/ex2-40e49d99a1ba38d5.4tn53av522z357v6.rcgu.o:(ex2::main::h6ceee2e1b3b2c246)
          

error: could not compile `ex2` (bin "ex2") due to previous error

[Jules-Bertholet]

@rustbot label A-linkage O-UEFI

[bjorn3]

fmodf should be defined by compiler-builtins when compiling for uefi: https://github.com/rust-lang/compiler-builtins/blob/80ed5f8c3ddbea7986c4a8243e42b963cb954b42/src/math.rs#L56

[taiki-e]

This should be fixed in rust-lang/compiler-builtins@588cc2a, and the fix should be available in Rust 1.75+ (#117581).

[radioactiveray]

The issue been fixed in Rust 1.75+ and the example compiles