rust-lld: lto="fat" prunes symbols that are used #105734

xobs · 2022-12-15T05:45:19Z

When compiling on riscv32imac-unknown-xous-elf, occasionally there is a linker error where the linker removes core::panicking::panic_str_nounwind::h9b449c0fe03c8dac and then complains that the symbol does not exist. It is trying to call this function from compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h3db6431f23a281c1.

Building with lto="thin" does not prune this symbol. Additionally, other crates do not have trouble, even if they call f32::sin() or f32::cos() which seem to use these functions.

Test code:

fn main() {
    for i in 0..2 {
        let x = i as f32;
        println!("cosf(x): {}", x.cos());
    }
}

Cargo.toml:

[package]
name = "libm_test"
version = "0.1.0"
edition = "2021"

[profile.dev]
lto = "fat"

Meta

rustc --version --verbose:

rustc 1.66.0 (69f9c33d7 2022-12-12)
binary: rustc
commit-hash: 69f9c33d71c871fc16ac445211281c6e7a340943
commit-date: 2022-12-12
host: x86_64-pc-windows-msvc
release: 1.66.0
LLVM version: 15.0.2

Build Output

[1:43:32 pm] E:/Code/Xous/libm_test> cargo build --target riscv32imac-unknown-xous-elf
   Compiling libm_test v0.1.0 (E:\Code\Xous\libm_test)
error: linking with `rust-lld` failed: exit code: 1
  |
  = note: "rust-lld" "-flavor" "gnu" "C:\\Users\\Sean\\AppData\\Local\\Temp\\rustcc9RUUw\\symbols.o" "E:\\Code\\Xous\\libm_test\\target\\riscv32imac-unknown-xous-elf\\debug\\deps\\libm_test-76ee56b79358e7a1.std-ebb179c122f95043.std.3da42809-cgu.0.rcgu.o.rcgu.o" "--as-needed" "-L" "E:\\Code\\Xous\\libm_test\\target\\riscv32imac-unknown-xous-elf\\debug\\deps" "-L" "E:\\Code\\Xous\\libm_test\\target\\debug\\deps" "-L" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib" "-Bstatic" "C:\\Users\\Sean\\AppData\\Local\\Temp\\rustcc9RUUw\\libxous-22b3b9f34be0acc4.rlib" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib\\libcompiler_builtins-b913bacb8fda1c55.rlib" "-Bdynamic" "--eh-frame-hdr" "-znoexecstack" "-L" "C:\\Users\\Sean\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\riscv32imac-unknown-xous-elf\\lib" "-o" "E:\\Code\\Xous\\libm_test\\target\\riscv32imac-unknown-xous-elf\\debug\\deps\\libm_test-76ee56b79358e7a1" "--gc-sections"
  = note: rust-lld: error: undefined symbol: core::panicking::panic_str_nounwind::h9b449c0fe03c8dac
          >>> referenced by compiler_builtins.22a3dcb1-cgu.13
          >>>               compiler_builtins-b913bacb8fda1c55.compiler_builtins.22a3dcb1-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h3db6431f23a281c1) in archive C:\Users\Sean\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\riscv32imac-unknown-xous-elf\lib\libcompiler_builtins-b913bacb8fda1c55.rlib
          >>> referenced by compiler_builtins.22a3dcb1-cgu.13
          >>>               compiler_builtins-b913bacb8fda1c55.compiler_builtins.22a3dcb1-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h3db6431f23a281c1) in archive C:\Users\Sean\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\riscv32imac-unknown-xous-elf\lib\libcompiler_builtins-b913bacb8fda1c55.rlib


error: could not compile `libm_test` due to previous error
[1:43:40 pm] E:/Code/Xous/libm_test>

The text was updated successfully, but these errors were encountered:

xobs · 2022-12-15T05:45:40Z

Note that I did not catch this as part of the nightly build as I am still waiting on #104101 to get merged

xobs · 2022-12-15T06:33:06Z

Also note that this fails for x86_64-fortanix-unknown-sgx

With lto="fat"

user@Ondo:~/Code/libm_test$ cat Cargo.toml
[package]
name = "libm_test"
version = "0.1.0"
edition = "2021"

[profile.dev]
lto = "fat"
user@Ondo:~/Code/libm_test$ RUSTC_BOOTSTRAP=1 cargo build --target x86_64-fortanix-unknown-sgx -Zbuild-std
   Compiling libm_test v0.1.0 (/home/user/Code/libm_test)
error: linking with `rust-lld` failed: exit status: 1
  |
  = note: "rust-lld" "-flavor" "gnu" "--version-script=/tmp/rustcuhJyHq/list" "-e" "elf_entry" "-Bstatic" "--gc-sections" "-z" "text" "-z" "norelro" "--no-undefined" "--error-unresolved-symbols" "--no-undefined-version" "-Bsymbolic" "--export-dynamic" "-u" "__rust_abort" "-u" "__rust_c_alloc" "-u" "__rust_c_dealloc" "-u" "__rust_print_err" "-u" "__rust_rwlock_rdlock" "-u" "__rust_rwlock_unlock" "-u" "__rust_rwlock_wrlock" "/tmp/rustcuhJyHq/symbols.o" "/home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libm_test-bc58705d3d7f1468.std-f95466e92e9a6dd6.std.85d6fccd-cgu.0.rcgu.o.rcgu.o" "--as-needed" "-L" "/home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps" "-L" "/home/user/Code/libm_test/target/debug/deps" "-L" "/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-fortanix-unknown-sgx/lib" "-Bstatic" "-lunwind" "/home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib" "-Bdynamic" "--eh-frame-hdr" "-znoexecstack" "-L" "/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-fortanix-unknown-sgx/lib" "-o" "/home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libm_test-bc58705d3d7f1468" "--gc-sections" "-pie"
  = note: rust-lld: error: undefined symbol: core::panicking::panic::h0f3533d9132f92e1
          >>> referenced by rem_pio2f.rs:60 (src/../libm/src/math/rem_pio2f.rs:60)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.1.rcgu.o:(compiler_builtins::math::libm::rem_pio2f::rem_pio2f::h87eccc73280ff7a5) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by rem_pio2f.rs:61 (src/../libm/src/math/rem_pio2f.rs:61)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.1.rcgu.o:(compiler_builtins::math::libm::rem_pio2f::rem_pio2f::h87eccc73280ff7a5) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by rem_pio2f.rs:64 (src/../libm/src/math/rem_pio2f.rs:64)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.1.rcgu.o:(compiler_builtins::math::libm::rem_pio2f::rem_pio2f::h87eccc73280ff7a5) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced 77 more times

          rust-lld: error: undefined symbol: core::panicking::panic_str_nounwind::hbaaec5f04f1a75e3
          >>> referenced by intrinsics.rs:2214 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:2214)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.0.rcgu.o:(core::ptr::read_volatile::h3ac619aa68a75721) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by intrinsics.rs:2214 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:2214)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.0.rcgu.o:(core::ptr::read_volatile::hb8e48ddf5e65cb7b) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by intrinsics.rs:2214 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/intrinsics.rs:2214)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.15.rcgu.o:(_$LT$usize$u20$as$u20$core..slice..index..SliceIndex$LT$$u5b$T$u5d$$GT$$GT$::get_unchecked::h67606a0b68744187) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced 4 more times

          rust-lld: error: undefined symbol: core::intrinsics::copy_nonoverlapping::hfb3d5412eadeaedf
          >>> referenced by mod.rs:1232 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:1232)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.0.rcgu.o:(core::ptr::read_unaligned::h5feb5085d94c7296) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by mod.rs:1232 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:1232)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.0.rcgu.o:(core::ptr::read_unaligned::h84db55d1b209da64) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by mod.rs:1232 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:1232)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.0.rcgu.o:(core::ptr::read_unaligned::ha2f349f3b71f94c1) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ops::range::RangeInclusive$LT$Idx$GT$::new::ha07de38d4900e337
          >>> referenced by rem_pio2_large.rs:260 (src/../libm/src/math/rem_pio2_large.rs:260)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h394954f1322d0319) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by rem_pio2_large.rs:270 (src/../libm/src/math/rem_pio2_large.rs:270)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h394954f1322d0319) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by rem_pio2_large.rs:272 (src/../libm/src/math/rem_pio2_large.rs:272)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h394954f1322d0319) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced 12 more times

          rust-lld: error: undefined symbol: _$LT$I$u20$as$u20$core..iter..traits..collect..IntoIterator$GT$::into_iter::h231634b2b56c56fb
          >>> referenced by rem_pio2_large.rs:313 (src/../libm/src/math/rem_pio2_large.rs:313)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h394954f1322d0319) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by x86_64.rs:160 (src/mem/x86_64.rs:160)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.4.rcgu.o:(compiler_builtins::mem::impls::compare_bytes::_$u7b$$u7b$closure$u7d$$u7d$::hc4f63bb035933f96) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::iter::range::_$LT$impl$u20$core..iter..traits..iterator..Iterator$u20$for$u20$core..ops..range..Range$LT$A$GT$$GT$::next::he9fd8d5fdd4d6791
          >>> referenced by rem_pio2_large.rs:313 (src/../libm/src/math/rem_pio2_large.rs:313)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.13.rcgu.o:(compiler_builtins::math::libm::rem_pio2_large::rem_pio2_large::h394954f1322d0319) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by x86_64.rs:160 (src/mem/x86_64.rs:160)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.4.rcgu.o:(compiler_builtins::mem::impls::compare_bytes::_$u7b$$u7b$closure$u7d$$u7d$::hc4f63bb035933f96) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::cmp::Ord::min::h4dec9fa1a980e168
          >>> referenced by x86_64.rs:179 (src/mem/x86_64.rs:179)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.4.rcgu.o:(compiler_builtins::mem::impls::rep_param::h2029fd4138ed741c) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::panicking::panic_fmt::h550b9c501efa5afd
          >>> referenced by mod.rs:396 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/fmt/mod.rs:396)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::fmt::Arguments::new_v1::hfc7532332f1d6c16) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by const_ptr.rs:1358 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1358)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_aligned_to::h2f007e806ab4ecb8) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by const_ptr.rs:1358 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1358)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_aligned_to::hcbfab17ad41c3d7f) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::addr::hb3db00afa0898b5c
          >>> referenced by const_ptr.rs:1362 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1362)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_aligned_to::h2f007e806ab4ecb8) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by const_ptr.rs:1362 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1362)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_aligned_to::hcbfab17ad41c3d7f) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ptr::read_unaligned::h3a8b67f5025006ab
          >>> referenced by const_ptr.rs:1224 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1224)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::read_unaligned::hcd2700b5ef939424) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ptr::read::hc11b02ad82c44566
          >>> referenced by const_ptr.rs:1183 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:1183)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::read::h8c6a5842d192e62d) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ptr::metadata::from_raw_parts::hd64d6a9206a64bc3
          >>> referenced by mod.rs:516 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:516)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_null::h28f840bc152a6d3e) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by mod.rs:516 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:516)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_null::h942b9c261cc14f59) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::guaranteed_eq::hbbdc9adb85c1ccb3
          >>> referenced by const_ptr.rs:39 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:39)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_null::h28f840bc152a6d3e) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by const_ptr.rs:39 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/const_ptr.rs:39)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.8.rcgu.o:(core::ptr::const_ptr::_$LT$impl$u20$$BP$const$u20$T$GT$::is_null::h942b9c261cc14f59) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib

          rust-lld: error: undefined symbol: core::mem::replace::hc497c98da982cdbf
          >>> referenced by range.rs:1057 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/range.rs:1057)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.9.rcgu.o:(_$LT$core..ops..range..RangeInclusive$LT$T$GT$$u20$as$u20$core..iter..range..RangeInclusiveIteratorImpl$GT$::spec_next_back::h22efa2ea959d5e9f) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib
          >>> referenced by range.rs:1012 (/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/iter/range.rs:1012)
          >>>               compiler_builtins-10d754e8a98988b8.compiler_builtins.e5a09702-cgu.9.rcgu.o:(_$LT$core..ops..range..RangeInclusive$LT$T$GT$$u20$as$u20$core..iter..range..RangeInclusiveIteratorImpl$GT$::spec_next::h784a0f19ab8353e9) in archive /home/user/Code/libm_test/target/x86_64-fortanix-unknown-sgx/debug/deps/libcompiler_builtins-10d754e8a98988b8.rlib


error: could not compile `libm_test` due to previous error
user@Ondo:~/Code/libm_test$

Without fat LTO

user@Ondo:~/Code/libm_test$ cat Cargo.toml
[package]
name = "libm_test"
version = "0.1.0"
edition = "2021"

[profile.dev]
#lto = "fat"
user@Ondo:~/Code/libm_test$ RUSTC_BOOTSTRAP=1 cargo build --target x86_64-fortanix-unknown-sgx -Zbuild-std
    Finished dev [unoptimized + debuginfo] target(s) in 0.02s
user@Ondo:~/Code/libm_test$

this is a space-optimized implementation of cosine. it's about 12k smaller than core lib's "proper" cosine. Gives about 9 bits amplitude resolution, and divides the waveform into 1024 time positions. Good enough for generating tones on a crappy speaker. Later on if anyone needs to "really" do cosine or sine, we'll have a footgun for them, but...let's hope Rust fixes issue rust-lang/rust#105734 before then, and we can deprecate this library in favor of the mathematically accurate and canonical cosine implementation.

genbattle · 2023-02-27T04:11:30Z

Is this possibly related to #107781?

Restore `#![no_builtins]` crates participation in LTO. After rust-lang#113716, we can make `#![no_builtins]` crates participate in LTO again. `#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again. ＼（＾▽＾）／ I will test the following issues later to verify. The task format is `Fixes {issue} {nightly-2023-07-20 result} {PR rust-lang#113923 result}`. - [x] Fixes rust-lang#72140. ❌ ✅ - [x] Fixes rust-lang#112245. ❌ ✅ - [x] Fixes rust-lang#110606. ❌ ✅ - [ ] Fixes rust-lang#105734. - [ ] Fixes rust-lang#96486. - [ ] Fixes rust-lang#108853. - [x] Fixes rust-lang/compiler-builtins#347. ❌ ✅ - [ ] Fixes rust-lang#108893. - [ ] Fixes rust-lang#78744. Fixes rust-lang#91158. Fixes rust-lang/cargo#10118. The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears. Some issues were not tested due to the difficulty of reproducing them. r? pnkfelix cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`

…kfelix Restore `#![no_builtins]` crates participation in LTO. After rust-lang#113716, we can make `#![no_builtins]` crates participate in LTO again. `#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again. ＼（＾▽＾）／ I will test the following issues later to verify. The task format is `Fixes {issue} {nightly-2023-07-20 result} {PR rust-lang#113923 result}`. - [x] Fixes rust-lang#72140. ❌ ✅ - [x] Fixes rust-lang#112245. ❌ ✅ - [x] Fixes rust-lang#110606. ❌ ✅ - [ ] Fixes rust-lang#105734. - [ ] Fixes rust-lang#96486. - [ ] Fixes rust-lang#108853. - [x] Fixes rust-lang/compiler-builtins#347. ❌ ✅ - [ ] Fixes rust-lang#108893. - [ ] Fixes rust-lang#78744. Fixes rust-lang#91158. Fixes rust-lang/cargo#10118. The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears. Some issues were not tested due to the difficulty of reproducing them. r? pnkfelix cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`

…kfelix Restore `#![no_builtins]` crates participation in LTO. After rust-lang#113716, we can make `#![no_builtins]` crates participate in LTO again. `#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again. Fixes rust-lang#72140. Fixes rust-lang#112245. Fixes rust-lang#110606. Fixes rust-lang#105734. Fixes rust-lang#96486. Fixes rust-lang#108853. Fixes rust-lang#108893. Fixes rust-lang#78744. Fixes rust-lang#91158. Fixes rust-lang/cargo#10118. Fixes rust-lang/compiler-builtins#347. The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears. Some issues were not tested due to the difficulty of reproducing them. r? pnkfelix cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`

Restore `#![no_builtins]` crates participation in LTO. After rust-lang#113716, we can make `#![no_builtins]` crates participate in LTO again. `#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again. Fixes rust-lang#72140. Fixes rust-lang#112245. Fixes rust-lang#110606. Fixes rust-lang#105734. Fixes rust-lang#96486. Fixes rust-lang#108853. Fixes rust-lang#108893. Fixes rust-lang#78744. Fixes rust-lang#91158. Fixes rust-lang/cargo#10118. Fixes rust-lang/compiler-builtins#347. The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears. Some issues were not tested due to the difficulty of reproducing them. r? pnkfelix cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`

…kfelix Restore `#![no_builtins]` crates participation in LTO. After rust-lang#113716, we can make `#![no_builtins]` crates participate in LTO again. `#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again. Fixes rust-lang#72140. Fixes rust-lang#112245. Fixes rust-lang#110606. Fixes rust-lang#105734. Fixes rust-lang#96486. Fixes rust-lang#108853. Fixes rust-lang#108893. Fixes rust-lang#78744. Fixes rust-lang#91158. Fixes rust-lang/cargo#10118. Fixes rust-lang/compiler-builtins#347. The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears. Some issues were not tested due to the difficulty of reproducing them. r? pnkfelix cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`

xobs added the C-bug Category: This is a bug. label Dec 15, 2022

xobs changed the title ~~Fat LTO prunes core::panicking::panic_str_nounwind::h9b449c0fe03c8dac~~ rust-lld: lto="fat" prunes symbols that are used Dec 15, 2022

bunnie mentioned this issue Jan 2, 2023

Can't use f32 transcendental functions (sin, cos) because lto fat is broken in rust 1.66 betrusted-io/xous-core#285

Open

workingjubilee added the O-xous OS: A microkernel OS for privacy in computing label Feb 26, 2023

DianQK mentioned this issue Jul 21, 2023

Restore #![no_builtins] crates participation in LTO. #113923

Merged

bors closed this as completed in 8c2b577 Dec 1, 2023

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rust-lld: lto="fat" prunes symbols that are used #105734

rust-lld: lto="fat" prunes symbols that are used #105734

xobs commented Dec 15, 2022 •

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xobs commented Dec 15, 2022

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genbattle commented Feb 27, 2023

rust-lld: lto="fat" prunes symbols that are used #105734

rust-lld: lto="fat" prunes symbols that are used #105734

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