From db170f3c70d7c371fc62ed6ab6f02f7ad245c21f Mon Sep 17 00:00:00 2001
From: Andreas Henriksson <andreas.henriksson@qrtech.se>
Date: Thu, 14 Dec 2023 12:33:43 +0100
Subject: [PATCH] atom: tests: Don't assume char signedness

For example on aarch64/arm64:

```
error[E0308]: mismatched types
  --> tests/atom_integration.rs:91:14
   |
91 |         URI: LV2Map::URI.as_ptr() as *const i8,
   |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*const u8`, found `*const i8`
   |
   = note: expected raw pointer `*const u8`
              found raw pointer `*const i8`

error[E0308]: mismatched types
   --> tests/atom_integration.rs:144:13
    |
141 |         let plugin = (plugin_descriptor.instantiate.unwrap())(
    |                      ---------------------------------------- arguments to this function are incorrect
...
144 |             b"\0".as_ptr() as *const i8,
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `*const u8`, found `*const i8`
    |
    = note: expected raw pointer `*const u8`
               found raw pointer `*const i8`

For more information about this error, try `rustc --explain E0308`.
error: could not compile `lv2-atom` due to 2 previous errors
```
---
 atom/tests/atom_integration.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/atom/tests/atom_integration.rs b/atom/tests/atom_integration.rs
index 9f6e6e0e..3a39d262 100644
--- a/atom/tests/atom_integration.rs
+++ b/atom/tests/atom_integration.rs
@@ -81,7 +81,7 @@ lv2_descriptors![AtomPlugin];
 fn main() {
     use atom::space::*;
     use lv2_urid::*;
-    use std::ffi::{c_void, CStr};
+    use std::ffi::{c_char, c_void, CStr};
     use std::mem::size_of;
     use std::pin::Pin;
     use urid::*;
@@ -93,7 +93,7 @@ fn main() {
 
     let mut map_feature_interface = Box::pin(mapper.as_mut().make_map_interface());
     let map_feature = Box::pin(sys::LV2_Feature {
-        URI: LV2Map::URI.as_ptr() as *const i8,
+        URI: LV2Map::URI.as_ptr() as *const c_char,
         data: map_feature_interface.as_mut().get_mut() as *mut _ as *mut c_void,
     });
     let features_list: &[*const sys::LV2_Feature] =
@@ -152,7 +152,7 @@ fn main() {
         let plugin = (plugin_descriptor.instantiate.unwrap())(
             plugin_descriptor,
             44100.0,
-            b"\0".as_ptr() as *const i8,
+            b"\0".as_ptr() as *const c_char,
             features_list.as_ptr(),
         );