xcrun: Segmentation fault: 11

[osxaudio]

Expected Result
Normal xcrun output is shown

Actual Result

Darling []# xcrun
Invoked with: /Library/Developer/DarlingCLT/usr/bin/xcrun
Segmentation fault: 11 (core dumped)

Steps To Reproduce

1. build darling from source make && sudo make install
2. launch darling shell
3. install commandline tools xcode-select --install
4. try to use xcrun

I was following the docs on "what to try" and tried to run Darling [~]$ clang hello-world.c -o hello-world which results in:

Darling []# clang
Invoked with: /Library/Developer/DarlingCLT/usr/bin/xcrun clang
Executing /Library/Developer/DarlingCLT/usr/bin/clang
Failed to execute program /Library/Developer/DarlingCLT/usr/bin/clang

xtrace

 Darling []# xtrace xcrun
  [120] getuid() -> 0
  [120] issetugid() -> 0
  [120] readlink("/var/db/xcode_select_link", 0x7F3AD62DB140, 1023) -> ENOENT
  [120] readlink("/usr/share/xcode-select/xcode_dir_link", 0x7F3AD62DB140, 1023) -> ENOENT
  [120] open("/usr/share/xcode-select/xcode_dir_path", O_RDONLY, 0) -> ENOENT
  [120] stat64("/Applications/Xcode.app", 0x7FFFFFDFF8F0) -> ENOENT
  [120] stat64("/Library/Developer/CommandLineTools", 0x7FFFFFDFF8F0) -> ENOENT
  [120] stat64("/Library/Developer/DarlingCLT", 0x7FFFFFDFF8F0) -> 0
  [120] execve("/Library/Developer/DarlingCLT/usr/bin/xcrun", {"/Library/Developer/DarlingCLT/usr/bin/xcrun"}, {"TERM=xterm-256color", "SHELL=/bin/bash", "CLICOLOR=1", "TMPDIR=/private/tmp", "USER=root", "LS_COLORS=rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=40;31;01:mi=00:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arc=01;31:*.arj=01;31:*.taz=01;31:dyld: warning: could not load inserted library '' into hardened process because image not found
  Invoked with: /Library/Developer/DarlingCLT/usr/bin/xcrun
  Segmentation fault: 11 (core dumped)

System Information
Ubuntu 20.04 on AMD Phenom(tm) II X6 1090T

Software	Version
Linux Kernel	5.4.0-182-generic
Darling	203af1f
Distro	"20.04.6 LTS (Focal Fossa)"

[osxaudio]

As a workaraund I am able to use xcrun included with Xcode 11.7. ( xcode-select -s Xcode.app/ && xcrun)
But when trying to use clang I now get: Illegal instruction: 4 (core dumped)

[osxaudio]

OK finally got lldb working, and my fear has become reality, I am missing SSE4 support again:

libclang.dylib`p_bracket:
->  0x7fffedae2638 <+1640>: pmovzxbd (%rdx,%rax), %xmm6        ; xmm6 = mem[0],zero,zero,zero,mem[1],zero,zero,zero,mem[2],zero,zero,zero,mem[3],zero,zero,zero
    0x7fffedae263e <+1646>: pmovzxbd 0x4(%rdx,%rax), %xmm7     ; xmm7 = mem[0],zero,zero,zero,mem[1],zero,zero,zero,mem[2],zero,zero,zero,mem[3],zero,zero,zero
    0x7fffedae2645 <+1653>: pand   %xmm0, %xmm6
    0x7fffedae2649 <+1657>: pand   %xmm4, %xmm6

seems like pmovzxbd is not available in opemu-linux :/

[CuriousTommy]

I wonder if Darling should support checking and warning the user if an SSE extension is not available.

It doesn't seem to hard to implement:
https://stackoverflow.com/a/7495023/5988706