Cross-compiling a static binary from GitHub Actions

[Vladimir Panteleev]

On Monday, 27 September 2021 at 02:27:32 UTC, kinke wrote:
> Thx, but it doesn't catch my interest - no docker on my 
> machine, plus the qemu AArch64 VM is on a different box. I 
> haven't heard of any other reports of this kind, and as there 
> are AArch64 distro packages of LDC (incl. Android packages 
> which I know are used by some people), I guess I would have 
> heard if such basic failures were wide-spread.

Rented an AWS EC2 ARM box today and tried it out there. The 
std.process segfaults indeed appear to be specific to the 
QEMU/binfmt interaction, however, exceptions still did not work. 
I narrowed it down to `-static`, confirming your guess. Seems to 
be an issue with unwinding?

```
   * frame #0: 0x0000000000518180 btdu-static-aarch64`gsignal + 224
     frame #1: 0x0000000000400434 btdu-static-aarch64`abort + 244
     frame #2: 0x000000000050e1f4 
btdu-static-aarch64`uw_init_context_1 + 580
     frame #3: 0x000000000050eb44 
btdu-static-aarch64`_Unwind_Backtrace + 84
     frame #4: 0x000000000054d214 btdu-static-aarch64`backtrace + 
68
     frame #5: 0x00000000004fb524 
btdu-static-aarch64`_D4core7runtime19defaultTraceHandlerFPvZC6object9Throwable9TraceInfo + 116
     frame #6: 0x00000000004fcf08 
btdu-static-aarch64`_d_createTrace + 76
     frame #7: 0x00000000004e1a6c 
btdu-static-aarch64`_d_throw_exception + 176
     frame #8: 0x00000000004399cc 
btdu-static-aarch64`_D3std9exception__T7bailOutHTC9ExceptionZQwFNaNfAyamMAxaZNn(file=(length = 39, ptr = u8"/home/ubuntu/btdu/source/btdu/subproc.d"), line=109, msg=(length = 33, ptr = u8"Unexpected subprocess termination")) at exception.d:517:9
```

To reproduce:

```console
$ echo 'import std.stdio, std.process; void main() { 
writeln(spawnProcess(["/bin/true"]).wait()); }' > test.d
$ ldc2-1.27.1-linux-aarch64/bin/ldc2 -static test.d
$ ./test
Aborted (core dumped)
```

Worth upgrading this to an issue?

Also, any ideas for workarounds? (Non-static builds lose most 
benefits of distributing pre-built binaries in the first place.)

Thanks!