rust-lld errors with duplicate symbol: __rustc_debug_gdb_scripts_section__ for embeded target.

[jparris]

Hi,

I'm using cargo xbuild to compile & link my code to a embedded target. @phil-opp the maintainer of cargo xbuild believes that this is a rust-ldd issue beginning with the second comment.

In short beginning with at least nightly-2018-03-06 I started getting linking error with the signature note: rust-lld: error: duplicate symbol: __rustc_debug_gdb_scripts_section_

My code is currently a private gitlab repo (I'd be happy to add anyone who needs access) but this issue has also been seen with https://github.com/toothbrush7777777/uefi-app-x64.

I've been working around this by adding the --release flag; but I'm at a point where I'd like to add gdb support.

ymir:munin$ just build
RUST_TARGET_PATH=`pwd`/arch/x86_64 cargo xbuild --target=x86_64-uefi
   Compiling bootloader v0.1.0 (file:///home/parrisj/src/munin) 
error: linking with `rust-lld` failed: exit code: 1
  |
  = note: "rust-lld" "-flavor" "link" "/Subsystem:EFI_Application" "/Entry:efi_main" "/LIBPATH:/home/parrisj/src/munin/target/sysroot/lib/rustlib/x86_64-uefi/lib" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16i0u6jlhoj1fwbo.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16u6js6g0l3k1ic6.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.170lmw1sqqfe80qo.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.1im38lueib99jsk0.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.1y16o1qfye96o7m0.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.2670nmqs1be3ww7y.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.2c1y7jr7pp6yeu55.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.2xj8e5u0nv6enw9x.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.49a7n47po4ttqjl7.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.4xq48u46a1pwiqn7.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.81jpvh8cn5k8ng8.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.8xzrsc1ux72v29j.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.98g0d9x8aw3akpe.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.9fcb3syd3ne5k0n.rcgu.o" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.c6lbtaiefvx3wya.rcgu.o" "/OUT:/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.efi" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.crate.allocator.rcgu.o" "/OPT:REF,NOICF" "/DEBUG" "/LIBPATH:/home/parrisj/src/munin/target/x86_64-uefi/debug/deps" "/LIBPATH:/home/parrisj/src/munin/target/debug/deps" "/LIBPATH:/home/parrisj/src/munin/target/sysroot/lib/rustlib/x86_64-uefi/lib" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/liblibuefi-73eea763ee59199f.rlib" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/libcty-5c786bc06dad6f6a.rlib" "/home/parrisj/src/munin/target/x86_64-uefi/debug/deps/libbitflags-5e29547bdbbce63f.rlib" "/home/parrisj/src/munin/target/sysroot/lib/rustlib/x86_64-uefi/lib/liballoc-326639068cfe9737.rlib" "/home/parrisj/src/munin/target/sysroot/lib/rustlib/x86_64-uefi/lib/libcore-27ea11fcee464c1f.rlib" "/home/parrisj/src/munin/target/sysroot/lib/rustlib/x86_64-uefi/lib/libcompiler_builtins-e9fbcd04a1fe51f6.rlib"
  = note: rust-lld: error: duplicate symbol: __rustc_debug_gdb_scripts_section__ in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16i0u6jlhoj1fwbo.rcgu.o and in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16u6js6g0l3k1ic6.rcgu.o
          rust-lld: error: duplicate symbol: __rustc_debug_gdb_scripts_section__ in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16i0u6jlhoj1fwbo.rcgu.o and in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.170lmw1sqqfe80qo.rcgu.o
          rust-lld: error: duplicate symbol: __rustc_debug_gdb_scripts_section__ in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16i0u6jlhoj1fwbo.rcgu.o and in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.1im38lueib99jsk0.rcgu.o
          rust-lld: error: duplicate symbol: __rustc_debug_gdb_scripts_section__ in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.16i0u6jlhoj1fwbo.rcgu.o and in /home/parrisj/src/munin/target/x86_64-uefi/debug/deps/bootloader-49ecc39b692d6c5e.1y16o1qfye96o7m0.rcgu.o
...

Target Triple

{
  "llvm-target": "x86_64-pc-windows-msvc",
  "target-endian": "little",
  "target-pointer-width": "64",
  "target-c-int-width": "32",
  "os": "uefi",
  "arch": "x86_64",
  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
  "linker": "rust-lld",
  "linker-flavor": "lld-link",
  "pre-link-args": {
    "lld-link": [
      "/Subsystem:EFI_Application",
      "/Entry:efi_main"
    ]
  },
  "panic-strategy": "abort",
  "default-hidden-visibility": true,
  "executables": true,
  "exe-suffix": ".efi",
  "is-like-windows": true
}

Version Info

$ rustc --version
rustc 1.29.0-nightly (54628c8ea 2018-07-30)
$ cargo --version
cargo 1.29.0-nightly (2cd36b4ed 2018-07-25)

[toothbrush7777777]

@jparris FYI, the name is LLD not LDD.

[GabrielMajeri]

I've also had this issue. As a (temporary?) workaround, for both debug and release builds, you can add "emit-debug-gdb-scripts": false to your target.json (see here for an example).

The disadvantage is that you do not get GDB scripts embedded into your binary. That script would tell GDB to load Rust pretty printers. Due to issue #33159, pretty printers don't work anyway, so nothing of value is lost.

[jparris]

@toothbrush7777777 doh
@GabrielMajeri thanks for the pointer to "emit-debug-gdb-scripts" it's a reasonable work around for now.

[jonas-schievink]

@jparris Is this still an issue?