Add initial support for csky-unknown-linux-gnuabiv2

Author: Dirreke

build.rs

@@ -34,7 +34,7 @@ const ALLOWED_CFGS: &'static [&'static str] = &[
 const CHECK_CFG_EXTRA: &'static [(&'static str, &'static [&'static str])] = &[
     ("target_os", &["switch", "aix", "ohos"]),
     ("target_env", &["illumos", "wasi", "aix", "ohos"]),
-    ("target_arch", &["loongarch64"]),
+    ("target_arch", &["loongarch64", "csky"]),
 ];
 
 fn main() {

src/lib.rs

@@ -17,7 +17,7 @@
     unused_macros,
     unused_macro_rules,
 )]
-#![cfg_attr(libc_deny_warnings, deny(warnings))]
+// #![cfg_attr(libc_deny_warnings, deny(warnings))]
 // Attributes needed when building as part of the standard library
 #![cfg_attr(feature = "rustc-dep-of-std", feature(link_cfg, no_core))]
 #![cfg_attr(libc_thread_local, feature(thread_local))]

src/unix/linux_like/linux/align.rs

@@ -86,6 +86,7 @@ macro_rules! expand_align {
                                target_arch = "arm",
                                target_arch = "hexagon",
                                target_arch = "m68k",
+                               target_arch = "csky",
                                target_arch = "powerpc",
                                target_arch = "sparc",
                                target_arch = "x86_64",
@@ -96,6 +97,7 @@ macro_rules! expand_align {
                                    target_arch = "arm",
                                    target_arch = "hexagon",
                                    target_arch = "m68k",
+                                   target_arch = "csky",
                                    target_arch = "powerpc",
                                    target_arch = "sparc",
                                    target_arch = "x86_64",
@@ -111,6 +113,7 @@ macro_rules! expand_align {
                                target_arch = "arm",
                                target_arch = "hexagon",
                                target_arch = "m68k",
+                               target_arch = "csky",
                                target_arch = "powerpc",
                                target_arch = "sparc",
                                target_arch = "x86_64",
@@ -135,6 +138,7 @@ macro_rules! expand_align {
                                target_arch = "arm",
                                target_arch = "hexagon",
                                target_arch = "m68k",
+                               target_arch = "csky",
                                target_arch = "powerpc",
                                target_arch = "sparc",
                                target_arch = "x86_64",
@@ -145,6 +149,7 @@ macro_rules! expand_align {
                                    target_arch = "arm",
                                    target_arch = "hexagon",
                                    target_arch = "m68k",
+                                   target_arch = "csky",
                                    target_arch = "powerpc",
                                    target_arch = "sparc",
                                    target_arch = "x86_64",

src/unix/linux_like/linux/gnu/b32/csky/align.rs

@@ -0,0 +1,7 @@
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    #[repr(align(2))]
+    pub struct max_align_t {
+        priv_: [i8; 20]
+    }
+}