generator: Emit new c"" CStr literals

These will land in Rust 1.76 and automatically append a `\0` terminator
in the compiler without having to have a checked or `unsafe`-unchecked
constructor on `CStr`.

Hacking in an invalid `\0` anywhere in the string is disallowed with a
compiler error.

Note that `proc-macro`, and by extension `proc-macro2` only has support
for parsing this literal, but not for emitting it yet.

.github/workflows/ci.yml

@@ -11,11 +11,11 @@ jobs:
       - run: cargo check --workspace --all-targets --all-features
 
   check_msrv:
-    name: Check ash, ash-window and ash-rewrite MSRV (1.69.0)
+    name: Check ash, ash-window and ash-rewrite MSRV (1.77.0)
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@1.69.0
+      - uses: dtolnay/rust-toolchain@1.77.0
       - name: Check ash, ash-window and ash-rewrite
         run: cargo check -p ash -p ash-rewrite -p ash-window --all-features
       - name: Check ash with no_std

ash-examples/src/bin/texture.rs

@@ -2,7 +2,6 @@
 
 use std::default::Default;
 use std::error::Error;
-use std::ffi;
 use std::io::Cursor;
 use std::mem;
 use std::os::raw::c_void;
@@ -567,7 +566,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             .create_pipeline_layout(&layout_create_info, None)
             .unwrap();
 
-        let shader_entry_name = ffi::CStr::from_bytes_with_nul_unchecked(b"main\0");
+        let shader_entry_name = c"main";
         let shader_stage_create_infos = [
             vk::PipelineShaderStageCreateInfo {
                 module: vertex_shader_module,

ash-examples/src/bin/triangle.rs

@@ -2,7 +2,6 @@
 
 use std::default::Default;
 use std::error::Error;
-use std::ffi;
 use std::io::Cursor;
 use std::mem;
 
@@ -229,7 +228,7 @@ fn main() -> Result<(), Box<dyn Error>> {
             .create_pipeline_layout(&layout_create_info, None)
             .unwrap();
 
-        let shader_entry_name = ffi::CStr::from_bytes_with_nul_unchecked(b"main\0");
+        let shader_entry_name = c"main";
         let shader_stage_create_infos = [
             vk::PipelineShaderStageCreateInfo {
                 module: vertex_shader_module,

ash-examples/src/lib.rs

@@ -212,11 +212,9 @@ impl ExampleBase {
                 .build(&event_loop)
                 .unwrap();
             let entry = Entry::linked();
-            let app_name = ffi::CStr::from_bytes_with_nul_unchecked(b"VulkanTriangle\0");
+            let app_name = c"VulkanTriangle";
 
-            let layer_names = [ffi::CStr::from_bytes_with_nul_unchecked(
-                b"VK_LAYER_KHRONOS_validation\0",
-            )];
+            let layer_names = [c"VK_LAYER_KHRONOS_validation"];
             let layers_names_raw: Vec<*const c_char> = layer_names
                 .iter()
                 .map(|raw_name| raw_name.as_ptr())

ash-window/Cargo.toml

@@ -16,7 +16,7 @@ categories = [
     "rendering::graphics-api"
 ]
 edition = "2021"
-rust-version = "1.69.0"
+rust-version = "1.77.0"
 
 [dependencies]
 ash = { path = "../ash", version = "0.37", default-features = false, features = ["std"] }

ash/Cargo.toml

@@ -19,7 +19,7 @@ categories = [
     "rendering::graphics-api"
 ]
 edition = "2021"
-rust-version = "1.69.0"
+rust-version = "1.77.0"
 
 [dependencies]
 libloading = { version = "0.8", optional = true }

ash/src/entry.rs

@@ -216,7 +216,7 @@ impl Entry {
     #[inline]
     pub unsafe fn try_enumerate_instance_version(&self) -> VkResult<Option<u32>> {
         let enumerate_instance_version: Option<vk::PFN_vkEnumerateInstanceVersion> = {
-            let name = ffi::CStr::from_bytes_with_nul_unchecked(b"vkEnumerateInstanceVersion\0");
+            let name = c"vkEnumerateInstanceVersion";
             mem::transmute((self.static_fn.get_instance_proc_addr)(
                 vk::Instance::null(),
                 name.as_ptr(),
@@ -328,7 +328,7 @@ impl crate::StaticFn {
     {
         Ok(Self {
             get_instance_proc_addr: unsafe {
-                let cname = ffi::CStr::from_bytes_with_nul_unchecked(b"vkGetInstanceProcAddr\0");
+                let cname = c"vkGetInstanceProcAddr";
                 let val = _f(cname);
                 if val.is_null() {
                     return Err(MissingEntryPoint);