Add x32 support. (#36)

Add x32 support, by adding special cases for it in the generator.

gen/src/main.rs

@@ -133,7 +133,13 @@ fn main() {
                 let mod_rs = format!("{}/{}.rs", src_arch, mod_name);
 
                 writeln!(src_lib_rs, "#[cfg(feature = \"{}\")]", mod_name).unwrap();
-                writeln!(src_lib_rs, "#[cfg(target_arch = \"{}\")]", rust_arch).unwrap();
+                if *rust_arch == "x32" {
+                    writeln!(src_lib_rs, "#[cfg(all(target_arch = \"x86_64\", target_pointer_width = \"32\"))]").unwrap();
+                } else if *rust_arch == "x86_64" {
+                    writeln!(src_lib_rs, "#[cfg(all(target_arch = \"x86_64\", target_pointer_width = \"64\"))]").unwrap();
+                } else {
+                    writeln!(src_lib_rs, "#[cfg(target_arch = \"{}\")]", rust_arch).unwrap();
+                }
                 writeln!(src_lib_rs, "#[path = \"{}/{}.rs\"]", rust_arch, mod_name).unwrap();
                 writeln!(src_lib_rs, "pub mod {};", mod_name).unwrap();
 
@@ -271,7 +277,7 @@ fn rust_arches(linux_arch: &str) -> &[&str] {
         "riscv" => &["riscv32", "riscv64"],
         "s390" => &["s390x"],
         "sparc" => &["sparc", "sparc64"],
-        "x86" => &["x86", "x86_64"],
+        "x86" => &["x86", "x86_64", "x32"],
         "alpha" | "cris" | "h8300" | "m68k" | "microblaze" | "mn10300" | "score" | "blackfin"
         | "frv" | "ia64" | "m32r" | "m68knommu" | "parisc" | "sh" | "um" | "xtensa"
         | "unicore32" | "c6x" | "nios2" | "openrisc" | "csky" | "arc" | "nds32" | "metag"
@@ -288,7 +294,7 @@ fn run_bindgen(
     rust_arch: &str,
     linux_version: &str,
 ) {
-    let clang_arch = compute_clang_arch(rust_arch);
+    let clang_target = compute_clang_target(rust_arch);
 
     eprintln!(
         "Generating bindings for {} on Linux {} architecture {}",
@@ -306,7 +312,7 @@ fn run_bindgen(
         })
         .array_pointers_in_arguments(true)
         .derive_debug(true)
-        .clang_arg(&format!("--target={}-unknown-linux", clang_arch))
+        .clang_arg(&format!("--target={}", clang_target))
         .clang_arg("-DBITS_PER_LONG=(__SIZEOF_LONG__*__CHAR_BIT__)")
         .clang_arg("-nostdinc")
         .clang_arg("-I")
@@ -333,10 +339,12 @@ fn run_bindgen(
         .expect(&format!("write_to_file for {}", mod_name));
 }
 
-fn compute_clang_arch(rust_arch: &str) -> &str {
+fn compute_clang_target(rust_arch: &str) -> String {
     if rust_arch == "x86" {
-        "i686"
+        format!("i686-unknown-linux")
+    } else if rust_arch == "x32" {
+        format!("x86_64-unknown-linux-gnux32")
     } else {
-        rust_arch
+        format!("{}-unknown-linux", rust_arch)
     }
 }

src/lib.rs

@@ -272,18 +272,34 @@ pub mod ioctl;
 #[path = "x86/netlink.rs"]
 pub mod netlink;
 #[cfg(feature = "errno")]
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 #[path = "x86_64/errno.rs"]
 pub mod errno;
 #[cfg(feature = "general")]
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 #[path = "x86_64/general.rs"]
 pub mod general;
 #[cfg(feature = "ioctl")]
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 #[path = "x86_64/ioctl.rs"]
 pub mod ioctl;
 #[cfg(feature = "netlink")]
-#[cfg(target_arch = "x86_64")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
 #[path = "x86_64/netlink.rs"]
 pub mod netlink;
+#[cfg(feature = "errno")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+#[path = "x32/errno.rs"]
+pub mod errno;
+#[cfg(feature = "general")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+#[path = "x32/general.rs"]
+pub mod general;
+#[cfg(feature = "ioctl")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+#[path = "x32/ioctl.rs"]
+pub mod ioctl;
+#[cfg(feature = "netlink")]
+#[cfg(all(target_arch = "x86_64", target_pointer_width = "32"))]
+#[path = "x32/netlink.rs"]
+pub mod netlink;

src/x32/errno.rs

@@ -0,0 +1,135 @@
+/* automatically generated by rust-bindgen 0.59.2 */
+
+pub const EPERM: u32 = 1;
+pub const ENOENT: u32 = 2;
+pub const ESRCH: u32 = 3;
+pub const EINTR: u32 = 4;
+pub const EIO: u32 = 5;
+pub const ENXIO: u32 = 6;
+pub const E2BIG: u32 = 7;
+pub const ENOEXEC: u32 = 8;
+pub const EBADF: u32 = 9;
+pub const ECHILD: u32 = 10;
+pub const EAGAIN: u32 = 11;
+pub const ENOMEM: u32 = 12;
+pub const EACCES: u32 = 13;
+pub const EFAULT: u32 = 14;
+pub const ENOTBLK: u32 = 15;
+pub const EBUSY: u32 = 16;
+pub const EEXIST: u32 = 17;
+pub const EXDEV: u32 = 18;
+pub const ENODEV: u32 = 19;
+pub const ENOTDIR: u32 = 20;
+pub const EISDIR: u32 = 21;
+pub const EINVAL: u32 = 22;
+pub const ENFILE: u32 = 23;
+pub const EMFILE: u32 = 24;
+pub const ENOTTY: u32 = 25;
+pub const ETXTBSY: u32 = 26;
+pub const EFBIG: u32 = 27;
+pub const ENOSPC: u32 = 28;
+pub const ESPIPE: u32 = 29;
+pub const EROFS: u32 = 30;
+pub const EMLINK: u32 = 31;
+pub const EPIPE: u32 = 32;
+pub const EDOM: u32 = 33;
+pub const ERANGE: u32 = 34;
+pub const EDEADLK: u32 = 35;
+pub const ENAMETOOLONG: u32 = 36;
+pub const ENOLCK: u32 = 37;
+pub const ENOSYS: u32 = 38;
+pub const ENOTEMPTY: u32 = 39;
+pub const ELOOP: u32 = 40;
+pub const EWOULDBLOCK: u32 = 11;
+pub const ENOMSG: u32 = 42;
+pub const EIDRM: u32 = 43;
+pub const ECHRNG: u32 = 44;
+pub const EL2NSYNC: u32 = 45;
+pub const EL3HLT: u32 = 46;
+pub const EL3RST: u32 = 47;
+pub const ELNRNG: u32 = 48;
+pub const EUNATCH: u32 = 49;
+pub const ENOCSI: u32 = 50;
+pub const EL2HLT: u32 = 51;
+pub const EBADE: u32 = 52;
+pub const EBADR: u32 = 53;
+pub const EXFULL: u32 = 54;
+pub const ENOANO: u32 = 55;
+pub const EBADRQC: u32 = 56;
+pub const EBADSLT: u32 = 57;
+pub const EDEADLOCK: u32 = 35;
+pub const EBFONT: u32 = 59;
+pub const ENOSTR: u32 = 60;
+pub const ENODATA: u32 = 61;
+pub const ETIME: u32 = 62;
+pub const ENOSR: u32 = 63;
+pub const ENONET: u32 = 64;
+pub const ENOPKG: u32 = 65;
+pub const EREMOTE: u32 = 66;
+pub const ENOLINK: u32 = 67;
+pub const EADV: u32 = 68;
+pub const ESRMNT: u32 = 69;
+pub const ECOMM: u32 = 70;
+pub const EPROTO: u32 = 71;
+pub const EMULTIHOP: u32 = 72;
+pub const EDOTDOT: u32 = 73;
+pub const EBADMSG: u32 = 74;
+pub const EOVERFLOW: u32 = 75;
+pub const ENOTUNIQ: u32 = 76;
+pub const EBADFD: u32 = 77;
+pub const EREMCHG: u32 = 78;
+pub const ELIBACC: u32 = 79;
+pub const ELIBBAD: u32 = 80;
+pub const ELIBSCN: u32 = 81;
+pub const ELIBMAX: u32 = 82;
+pub const ELIBEXEC: u32 = 83;
+pub const EILSEQ: u32 = 84;
+pub const ERESTART: u32 = 85;
+pub const ESTRPIPE: u32 = 86;
+pub const EUSERS: u32 = 87;
+pub const ENOTSOCK: u32 = 88;
+pub const EDESTADDRREQ: u32 = 89;
+pub const EMSGSIZE: u32 = 90;
+pub const EPROTOTYPE: u32 = 91;
+pub const ENOPROTOOPT: u32 = 92;
+pub const EPROTONOSUPPORT: u32 = 93;
+pub const ESOCKTNOSUPPORT: u32 = 94;
+pub const EOPNOTSUPP: u32 = 95;
+pub const EPFNOSUPPORT: u32 = 96;
+pub const EAFNOSUPPORT: u32 = 97;
+pub const EADDRINUSE: u32 = 98;
+pub const EADDRNOTAVAIL: u32 = 99;
+pub const ENETDOWN: u32 = 100;
+pub const ENETUNREACH: u32 = 101;
+pub const ENETRESET: u32 = 102;
+pub const ECONNABORTED: u32 = 103;
+pub const ECONNRESET: u32 = 104;
+pub const ENOBUFS: u32 = 105;
+pub const EISCONN: u32 = 106;
+pub const ENOTCONN: u32 = 107;
+pub const ESHUTDOWN: u32 = 108;
+pub const ETOOMANYREFS: u32 = 109;
+pub const ETIMEDOUT: u32 = 110;
+pub const ECONNREFUSED: u32 = 111;
+pub const EHOSTDOWN: u32 = 112;
+pub const EHOSTUNREACH: u32 = 113;
+pub const EALREADY: u32 = 114;
+pub const EINPROGRESS: u32 = 115;
+pub const ESTALE: u32 = 116;
+pub const EUCLEAN: u32 = 117;
+pub const ENOTNAM: u32 = 118;
+pub const ENAVAIL: u32 = 119;
+pub const EISNAM: u32 = 120;
+pub const EREMOTEIO: u32 = 121;
+pub const EDQUOT: u32 = 122;
+pub const ENOMEDIUM: u32 = 123;
+pub const EMEDIUMTYPE: u32 = 124;
+pub const ECANCELED: u32 = 125;
+pub const ENOKEY: u32 = 126;
+pub const EKEYEXPIRED: u32 = 127;
+pub const EKEYREVOKED: u32 = 128;
+pub const EKEYREJECTED: u32 = 129;
+pub const EOWNERDEAD: u32 = 130;
+pub const ENOTRECOVERABLE: u32 = 131;
+pub const ERFKILL: u32 = 132;
+pub const EHWPOISON: u32 = 133;