Re: [ISSUE] [CLOSED] Missing obstack symbols for arduino-cli binaries on musl

[Johnnynator <Johnnynator@users.noreply.github.com>]

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Closed issue by kqo on void-packages repository

https://github.com/void-linux/void-packages/issues/22616

Description:
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### System

* xuname:
  * Void 5.6.2 x86_64-musl GenuineIntel uptodate rrFFFF
* package:
  * arduino-cli
  * gcompat
  * musl-obstack

### Expected behavior

Binaries pulled in by `arduino-cli` which are linked against `glibc` should hopefully work on musl after #22237 (which fixed other missing symbols, thank you for that!).

### Actual behavior

The `arm-none-eabi-g++` binary pulled in by the `arduino:sam` core is still missing symbols from obstack, namely:

```
Error relocating [...]/arduino/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-g++: _obstack_newchunk: symbol not found
Error relocating [...]/arduino/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-g++: obstack_free: symbol not found
Error relocating [...]/arduino/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-g++: _obstack_begin: symbol not found
Error relocating [...]/arduino/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-g++: _obstack_memory_used: symbol not found
```

`gcompat` seems to support building with `musl-obstack`, so I [tried enabling support](https://github.com/void-linux/void-packages/compare/master...kqo:gcompat-arduino) in the template. I can see that `musl-obstack` gets linked in with `-lobstack`, but the binary still can't find the symbols, nor can I with `nm`.

I'm really out of my depth with this, so I'm not sure if this is a `gcompat` problem, something I'm doing wrong with `xbps`, or if I'm just misunderstanding how things are supposed to work.

### Steps to reproduce the behavior

This will bump into the binary needing obstack symbols:
```
$ arduino-cli core update-index
$ arduino-cli core install arduino:sam
$ arduino-cli sketch new test_sketch
$ arduino-cli compile test_sketch --fqbn arduino:sam:arduino_due_x_dbg
```

It's probably quicker to run:
```
$ LD_PRELOAD=/usr/lib/libgcompat.so.0 ldd ~/.local/share/arduino/packages/arduino/tools/arm-none-eabi-gcc/4.8.3-2014q1/bin/arm-none-eabi-g++
```