update libc linux headers to v5.16-rc3

 * Add missing Linux headers. Closes #9837
 * Update existing headers to latest Linux.
 * Consolidate headers that are the same for multiple Zig target CPU
   architectures. For example, Linux has only an x86 directory for both
   x86_64 and x86 CPU architectures. Now Zig only ships an x86 directory
   for Linux headers, and will emit the proper corresponding -isystem
   flags.
 * tools/update-linux-headers.zig is now available for upgrading to
   newer Linux headers, and the update process is now documented on the
   wiki.

1 files changed, 16 insertions, 0 deletions

diff --git a/src/target.zig b/src/target.zig
index 6f6d9f811d..9d22feff66 100644
--- a/src/target.zig
+++ b/src/target.zig
@@ -106,6 +106,22 @@ pub fn libCGenericName(target: std.Target) [:0]const u8 {
     }
 }
 
+pub fn osArchName(target: std.Target) [:0]const u8 {
+    return switch (target.os.tag) {
+        .linux => switch (target.cpu.arch) {
+            .arm, .armeb, .thumb, .thumbeb => "arm",
+            .aarch64, .aarch64_be, .aarch64_32 => "arm64",
+            .mips, .mipsel, .mips64, .mips64el => "mips",
+            .powerpc, .powerpcle, .powerpc64, .powerpc64le => "powerpc",
+            .riscv32, .riscv64 => "riscv",
+            .sparc, .sparcel, .sparcv9 => "sparc",
+            .i386, .x86_64 => "x86",
+            else => @tagName(target.cpu.arch),
+        },
+        else => @tagName(target.cpu.arch),
+    };
+}
+
 pub fn canBuildLibC(target: std.Target) bool {
     for (available_libcs) |libc| {
         if (target.cpu.arch == libc.arch and target.os.tag == libc.os and target.abi == libc.abi) {