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@OJaksch: Thanks for your feedback, great to hear that it works now.

The warning is expected with newer rustc versions, but nothing to worry about and also happens on x86-64, we will improve the code style here probably soonish to avoid the warning.

Of course, friend. Just compiled it on my RPi400 w/o any problems now.
There is a security warning that I don't know if it is relevant.

   Compiling pxar v0.12.1 (/var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/pxar)
warning: creating a mutable reference to mutable static is discouraged
  --> /var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/pxar/src/decoder/mod.rs:35:21
   |
35 |     unsafe { &mut (*SCRATCH_BUFFER.as_mut_ptr())[..] }
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable reference to mutable static
   |
   = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html>
   = note: mutable references to mutable statics are dangerous; it's undefined behavior if any other pointer to the static is used or if any other reference is created for the static while the mutable reference lives
   = note: `#[warn(static_mut_refs)]` on by default

warning: `pxar` (lib) generated 1 warning

@OJaksch: argh, I made a stupid mistake, can you please retry the just pushed 3.3.2-3 version?

Thanks, but no, same error:

   Compiling proxmox-sys v0.6.5 (/var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/proxmox/proxmox-sys)
error[E0308]: mismatched types
    --> /var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/proxmox/proxmox-sys/src/fs/dir.rs:216:50
     |
216  |     let returned_buffer = unsafe { libc::mkdtemp(template.as_mut_ptr() as *mut i8) };
     |                                    ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*mut u8`, found `*mut i8`
     |                                    |
     |                                    arguments to this function are incorrect
     |
     = note: expected raw pointer `*mut u8`
                found raw pointer `*mut i8`
note: function defined here
    --> /home/larry/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.169/src/unix/mod.rs:1479:12
     |
1479 |     pub fn mkdtemp(template: *mut c_char) -> *mut c_char;
     |            ^^^^^^^

For more information about this error, try `rustc --explain E0308`.
error: could not compile `proxmox-sys` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

@OJaksch: Thanks for the report, I made a patch that should fix this, but I had no aarch64 host around to actually test it, so YMMW.

It's me again and compiling on aarch64 is failing again:

   Compiling http v0.2.12
   Compiling proxmox-sys v0.6.4 (/var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/proxmox/proxmox-sys)
error[E0308]: mismatched types
    --> /var/cache/pacman/pkg/yaourt/proxmox-backup-client/src/proxmox/proxmox-sys/src/fs/dir.rs:211:50
     |
211  |     let returned_buffer = unsafe { libc::mkdtemp(template.as_mut_ptr() as *mut i8) };
     |                                    ------------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*mut u8`, found `*mut i8`
     |                                    |
     |                                    arguments to this function are incorrect
     |
     = note: expected raw pointer `*mut u8`
                found raw pointer `*mut i8`
note: function defined here
    --> /home/larry/.cargo/registry/src/index.crates.io-6f17d22bba15001f/libc-0.2.169/src/unix/mod.rs:1479:12
     |
1479 |     pub fn mkdtemp(template: *mut c_char) -> *mut c_char;
     |            ^^^^^^^

For more information about this error, try `rustc --explain E0308`.
error: could not compile `proxmox-sys` (lib) due to 1 previous error
warning: build failed, waiting for other jobs to finish...

To everyone who is using this great tool together with an uptodate PBS and isn't aware of the new features:
Add --change-detection-mode data (or metadata) to your command/script to give your backup a significant burst!

Just compiled on x86_64 and aarch64 and can confirm that it's building fine again on the latter.
Thanks for fixing!

@OJaksch I backported a patch for an internal dependency [0] that should fix this error, but I did not have an aarch64 ready to quickly test this, so feedback would be welcome.

Doesn't build on aarch64 anymore. There were some warnings before the build failed.
If you need a more detailed log, gimme sign.

   Compiling proxmox-sys v0.5.8 (/tmp/x/src/proxmox/proxmox-sys)
   Compiling form_urlencoded v1.2.1
error[E0308]: mismatched types
  --> /tmp/x/src/proxmox/proxmox-sys/src/crypt.rs:74:67
   |
74 |         if data.output.first().is_none() || Some(&('*' as i8)) == data.output.first() {
   |                                                                   ^^^^^^^^^^^^^^^^^^^ expected `Option<&i8>`, found `Option<&u8>`
   |
   = note: expected enum `std::option::Option<&i8>`
              found enum `std::option::Option<&u8>`

error[E0308]: mismatched types
   --> /tmp/x/src/proxmox/proxmox-sys/src/crypt.rs:136:58
    |
136 |     if output.first().is_none() || Some(&('*' as i8)) == output.first() {
    |                                                          ^^^^^^^^^^^^^^ expected `Option<&i8>`, found `Option<&u8>`
    |
    = note: expected enum `std::option::Option<&i8>`
               found enum `std::option::Option<&u8>`

   Compiling crc32fast v1.4.2
   Compiling base64 v0.22.1
For more information about this error, try `rustc --explain E0308`.
error: could not compile `proxmox-sys` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...