Target definition for wasm32-wali-linux-musl to support the Wasm Linux

Interface

This commit does not patch libc, stdarch, or cc

Author: arjunr2

core/src/ffi/primitives.rs

@@ -133,7 +133,10 @@ mod c_char_definition {
 
 mod c_long_definition {
     cfg_if! {
-        if #[cfg(all(target_pointer_width = "64", not(windows)))] {
+        if #[cfg(any(
+            all(target_pointer_width = "64", not(windows)),
+            // wasm32 Linux ABI uses 64-bit long
+            all(target_arch = "wasm32", target_os = "linux")))] {
             pub(super) type c_long = i64;
             pub(super) type c_ulong = u64;
         } else {

unwind/src/libunwind.rs

@@ -72,9 +72,12 @@ pub const unwinder_private_data_size: usize = 2;
 #[cfg(any(target_arch = "riscv64", target_arch = "riscv32"))]
 pub const unwinder_private_data_size: usize = 2;
 
-#[cfg(target_os = "emscripten")]
+#[cfg(all(target_arch = "wasm32", target_os = "emscripten"))]
 pub const unwinder_private_data_size: usize = 20;
 
+#[cfg(all(target_arch = "wasm32", target_os = "linux"))]
+pub const unwinder_private_data_size: usize = 2;
+
 #[cfg(all(target_arch = "hexagon", target_os = "linux"))]
 pub const unwinder_private_data_size: usize = 35;