Move panic_handler and eh_personality to spirv-std (#95)

Author: khyperia

examples/example-shader/src/lib.rs

@@ -1,13 +1,10 @@
 //! Ported to Rust from https://github.com/Tw1ddle/Sky-Shader/blob/master/src/shaders/glsl/sky.fragment
 
 #![no_std]
-#![feature(lang_items)]
 #![feature(register_attr)]
 #![register_attr(spirv)]
 
 use core::f32::consts::PI;
-#[cfg(not(test))]
-use core::panic::PanicInfo;
 use spirv_std::{Input, Mat4, MathExt, Output, Vec3, Vec4};
 
 const DEPOLARIZATION_FACTOR: f32 = 0.035;
@@ -184,13 +181,3 @@ pub fn main_vs(
     out_pos.store(in_pos.load());
     out_color.store(in_pos.load());
 }
-
-#[cfg(not(test))]
-#[panic_handler]
-fn panic(_: &PanicInfo) -> ! {
-    loop {}
-}
-
-#[cfg(not(test))]
-#[lang = "eh_personality"]
-extern "C" fn rust_eh_personality() {}

spirv-std/src/lib.rs

@@ -1,10 +1,12 @@
 #![no_std]
-#![feature(register_attr, repr_simd, core_intrinsics)]
+#![feature(register_attr, repr_simd, core_intrinsics, lang_items)]
 #![register_attr(spirv)]
 
 pub mod math;
 pub use crate::math::MathExt;
 pub use crate::math::*;
+#[cfg(target_arch = "spirv")]
+use core::panic::PanicInfo;
 
 macro_rules! pointer_addrspace_write {
     (false) => {};
@@ -67,6 +69,16 @@ pointer_addrspace!("physical_storage_buffer", PhysicalStorageBuffer, true);
 #[repr(simd)]
 pub struct f32x4(pub f32, pub f32, pub f32, pub f32);
 
+#[cfg(target_arch = "spirv")]
+#[panic_handler]
+fn panic(_: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[cfg(target_arch = "spirv")]
+#[lang = "eh_personality"]
+extern "C" fn rust_eh_personality() {}
+
 /// libcore requires a few external symbols to be defined:
 /// https://github.com/rust-lang/rust/blob/c2bc344eb23d8c1d18e803b3f1e631cf99926fbb/library/core/src/lib.rs#L23-L27
 /// TODO: This is copied from compiler_builtins/mem.rs. Can we use that one instead? The note in the above link says