GUI example error when using legacy linker on linux

[Anton-4]

$ cargo run -- run --linker=legacy examples/gui/Hello.roc
    Finished dev [unoptimized + debuginfo] target(s) in 0.31s
     Running `target/debug/roc run --linker=legacy examples/gui/Hello.roc`
🔨 Rebuilding platform...
/nix/store/vhf2cr6immz4qdxd83y025fnxim8mmfg-binutils-2.38/bin/ld: examples/gui/platform/host.o:(.data._rust_extern_with_linkage___dso_handle+0x0): undefined reference to `__dso_handle'
/nix/store/vhf2cr6immz4qdxd83y025fnxim8mmfg-binutils-2.38/bin/ld: /nix/store/6f66prpgx1qx4n6k450sxs3d157ia1ps-glibc-2.35-163/lib/libc_nonshared.a(pthread_atfork.oS): in function `__pthread_atfork':
(.text+0x7): undefined reference to `__dso_handle'
/nix/store/vhf2cr6immz4qdxd83y025fnxim8mmfg-binutils-2.38/bin/ld: examples/gui/hello-gui: hidden symbol `__dso_handle' isn't defined
/nix/store/vhf2cr6immz4qdxd83y025fnxim8mmfg-binutils-2.38/bin/ld: final link failed: bad value
1 error and 0 warnings found in 37699 ms.

Running program anyway…

────────────────────────────────────────────────────────────────────────────────
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', crates/cli/src/lib.rs:639:61
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace```

To get around this we always used our own surgical linker instead (cargo run -- run examples/gui/Hello.roc).

This error is very similar to the one in issue #1157.

[nick-gravgaard]

This is strange. It looks like the helloWorld binary works when run through valgrind but not when run directly:

[nick@nick-x270 roc]$ cargo run examples/hello-world/main.roc
<lots of debug info snipped>
Segmentation fault

[nick@nick-x270 roc]$ ./examples/hello-world/helloWorld
Segmentation fault

[nick@nick-x270 roc]$ valgrind --leak-check=full --track-origins=yes ./examples/hello-world/helloWorld
==60130== Memcheck, a memory error detector
==60130== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==60130== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info
==60130== Command: ./examples/hello-world/helloWorld
==60130==
Hello, World!
==60130==
==60130== HEAP SUMMARY:
==60130==     in use at exit: 0 bytes in 0 blocks
==60130==   total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==60130==
==60130== All heap blocks were freed -- no leaks are possible
==60130==
==60130== For lists of detected and suppressed errors, rerun with: -s
==60130== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

(new lines added for clarity)

[Anton-4]

This now also happens with the surgical linker but only on aarch64 linux (raspberry pi 4, outside of nix):

---- cli_run::hello_gui stdout ----
thread 'cli_run::hello_gui' panicked at '
___________
The roc command:

  "/home/username/gitrepos/roc2/roc/target/release/roc build --optimize /home/username/gitrepos/roc2/roc/examples/gui/hello.roc --"

had unexpected stderr:

  🔨 Rebuilding platform...
ld: /home/username/gitrepos/roc2/roc/examples/gui/platform/linux-arm64.o:(.data._rust_extern_with_linkage___dso_handle+0x0): undefined reference to `__dso_handle'
ld: /usr/lib/aarch64-linux-gnu/libc_nonshared.a(pthread_atfork.oS): in function `__pthread_atfork':
(.text+0x0): undefined reference to `__dso_handle'
ld: (.text+0x4): undefined reference to `__dso_handle'
ld: /home/username/gitrepos/roc2/roc/examples/gui/hello-gui: hidden symbol `__dso_handle' isn't defined
ld: final link failed: bad value
thread 'main' panicked at 'not yet implemented: gracefully handle `ld` (or `zig` in the case of wasm with --optimize) returning exit code Some(1)', crates/compiler/build/src/program.rs:1036:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace