Auto merge of #3301 - Dirreke:csky-unknown-linux-gnuabiv2, r=JohnTitor

add initial support for csky-unknown-linux-gnuabiv2

Add libc-files to allow rust to be used on the csky/linux platform with a PR rust-lang/rust#113658 for rust

Signed-off-by:  [`@Dirreke](https://github.com/Dirreke)` [[email protected]]([email protected])

Author: bors

build.rs

@@ -35,7 +35,10 @@ 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", "mips32r6", "mips64r6"]),
+    (
+        "target_arch",
+        &["loongarch64", "mips32r6", "mips64r6", "csky"],
+    ),
 ];
 
 fn main() {

src/unix/linux_like/linux/align.rs

@@ -89,6 +89,7 @@ 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",
@@ -100,6 +101,7 @@ 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",
@@ -116,6 +118,7 @@ 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",
@@ -142,6 +145,7 @@ 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",
@@ -153,6 +157,7 @@ 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/arch/generic/mod.rs

@@ -95,6 +95,7 @@ cfg_if! {
     if #[cfg(all(any(target_arch = "x86",
                      target_arch = "x86_64",
                      target_arch = "aarch64",
+                     target_arch = "csky",
                      target_arch = "loongarch64"),
                  not(any(target_env = "musl", target_env = "ohos"))))] {
         pub const SO_TIMESTAMP_NEW: ::c_int = 63;
@@ -115,6 +116,7 @@ cfg_if! {
                  target_arch = "aarch64",
                  target_arch = "riscv64",
                  target_arch = "s390x",
+                 target_arch = "csky",
                  target_arch = "loongarch64"))] {
         pub const FICLONE: ::c_ulong = 0x40049409;
         pub const FICLONERANGE: ::c_ulong = 0x4020940D;

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

@@ -0,0 +1,7 @@
+s_no_extra_traits! {
+    #[allow(missing_debug_implementations)]
+    #[repr(align(8))]
+    pub struct max_align_t {
+        priv_: [i64; 2]
+    }
+}