Separate L4Re from Linux code, add aarch64 and enable tests

The L4Re code was previously attached to the Linux code which was not
correct in many ways. This commit separates the L4Re code and enables
the libc-tests and includes the fixes for the failing tests. Aarch64 is
added as a second supported architecture (more to come).

Author: farao

libc-test/build.rs

@@ -53,6 +53,7 @@ fn do_ctest() {
         t if t.contains("emscripten") => test_emscripten(t),
         t if t.contains("freebsd") => test_freebsd(t),
         t if t.contains("haiku") => test_haiku(t),
+        t if t.contains("l4re") => test_linux(t),
         t if t.contains("linux") => test_linux(t),
         t if t.contains("netbsd") => test_netbsd(t),
         t if t.contains("openbsd") => test_openbsd(t),
@@ -94,9 +95,10 @@ fn do_semver() {
     // NOTE: Android doesn't include the unix file (or the Linux file) because
     // there are some many definitions missing it's actually easier just to
     // maintain a file for Android.
-    // NOTE: AIX doesn't include the unix file because there are definitions
-    // missing on AIX. It is easier to maintain a file for AIX.
-    if family != os && !matches!(os.as_str(), "android" | "aix") {
+    // NOTE: AIX and L4Re do not include the unix file because there are
+    // definitions missing on these systems. It is easier to maintain separate
+    // files for them.
+    if family != os && !matches!(os.as_str(), "android" | "aix" | "l4re") {
         process_semver_file(&mut output, &mut semver_root, &family);
     }
     // We don't do semver for unknown targets.
@@ -3563,18 +3565,26 @@ fn config_gnu_bits(target: &str, cfg: &mut ctest::TestGenerator) {
 }
 
 fn test_linux(target: &str) {
-    assert!(target.contains("linux"));
+    assert!(target.contains("linux") || target.contains("l4re"));
+
+    // target_os
+    let linux = target.contains("linux");
+    let l4re = target.contains("l4re");
 
     // target_env
     let gnu = target.contains("gnu");
     let musl = target.contains("musl") || target.contains("ohos");
     let uclibc = target.contains("uclibc");
 
-    match (gnu, musl, uclibc) {
-        (true, false, false) => (),
-        (false, true, false) => (),
-        (false, false, true) => (),
-        (_, _, _) => panic!("linux target lib is gnu: {gnu}, musl: {musl}, uclibc: {uclibc}"),
+    match (linux, gnu, musl, uclibc) {
+        (true, true, false, false) => (),
+        (true, false, true, false) => (),
+        (true, false, false, true) => (),
+        (false, false, false, true) => (),
+        (_, _, _, _) => panic!(
+            "{} target lib is gnu: {gnu}, musl: {musl}, uclibc: {uclibc}",
+            if linux { "linux" } else { "l4re" }
+        ),
     }
 
     let arm = target.contains("arm");
@@ -3608,6 +3618,9 @@ fn test_linux(target: &str) {
         .define("__GLIBC_USE_DEPRECATED_SCANF", None);
 
     config_gnu_bits(target, &mut cfg);
+    if l4re {
+        cfg.flag("-Wno-unused-function");
+    }
 
     headers! { cfg:
                "ctype.h",
@@ -3626,11 +3639,12 @@ fn test_linux(target: &str) {
                "libgen.h",
                "limits.h",
                "link.h",
-               "linux/sysctl.h",
+               [uclibc]: "linux/if_ether.h",
+               [!l4re]: "linux/sysctl.h",
                "locale.h",
                "malloc.h",
                "mntent.h",
-               "mqueue.h",
+               [!l4re]: "mqueue.h",
                "net/ethernet.h",
                "net/if.h",
                "net/if_arp.h",
@@ -3640,6 +3654,7 @@ fn test_linux(target: &str) {
                "netinet/ip.h",
                "netinet/tcp.h",
                "netinet/udp.h",
+               [l4re]: "netpacket/packet.h",
                "poll.h",
                "pthread.h",
                "pty.h",
@@ -3650,43 +3665,44 @@ fn test_linux(target: &str) {
                "semaphore.h",
                "shadow.h",
                "signal.h",
-               "spawn.h",
-               "stddef.h",
+               [!l4re]: "spawn.h",
+               [!l4re]: "stddef.h",
                "stdint.h",
                "stdio.h",
                "stdlib.h",
                "string.h",
-               "sys/epoll.h",
-               "sys/eventfd.h",
+               [l4re]: "sys/auxv.h",
+               [!l4re]: "sys/epoll.h",
+               [!l4re]: "sys/eventfd.h",
                "sys/file.h",
-               "sys/fsuid.h",
-               "sys/klog.h",
-               "sys/inotify.h",
+               [!l4re]: "sys/fsuid.h",
+               [!l4re]: "sys/klog.h",
+               [!l4re]: "sys/inotify.h",
                "sys/ioctl.h",
                "sys/ipc.h",
                "sys/mman.h",
                "sys/mount.h",
-               "sys/msg.h",
-               "sys/personality.h",
+               [!l4re]: "sys/msg.h",
+               [!l4re]: "sys/personality.h",
                "sys/prctl.h",
-               "sys/ptrace.h",
-               "sys/quota.h",
-               "sys/random.h",
-               "sys/reboot.h",
+               [!l4re]: "sys/ptrace.h",
+               [!l4re]: "sys/quota.h",
+               [!l4re]: "sys/random.h",
+               [!l4re]: "sys/reboot.h",
                "sys/resource.h",
                "sys/sem.h",
-               "sys/sendfile.h",
+               [!l4re]: "sys/sendfile.h",
                "sys/shm.h",
-               "sys/signalfd.h",
+               [!l4re]: "sys/signalfd.h",
                "sys/socket.h",
                "sys/stat.h",
                "sys/statvfs.h",
-               "sys/swap.h",
+               [!l4re]: "sys/swap.h",
                "sys/syscall.h",
                "sys/time.h",
-               "sys/timerfd.h",
+               [!l4re]: "sys/timerfd.h",
                "sys/times.h",
-               "sys/timex.h",
+               [!l4re]: "sys/timex.h",
                "sys/types.h",
                "sys/uio.h",
                "sys/un.h",
@@ -3708,12 +3724,12 @@ fn test_linux(target: &str) {
                // ARM: https://bugzilla.redhat.com/show_bug.cgi?id=1116162
                // Also unavailable on gnueabihf with glibc 2.30.
                // https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=6b33f373c7b9199e00ba5fbafd94ac9bfb4337b1
-               [(x86_64 || x86_32 || arm) && !gnueabihf]: "sys/io.h",
+               [(x86_64 || x86_32 || arm) && !gnueabihf && !l4re]: "sys/io.h",
                // `sys/reg.h` is only available on x86 and x86_64
-               [x86_64 || x86_32]: "sys/reg.h",
+               [(x86_64 || x86_32) && !l4re]: "sys/reg.h",
                // sysctl system call is deprecated and not available on musl
                // It is also unsupported in x32, deprecated since glibc 2.30:
-               [!(x32 || musl || gnu)]: "sys/sysctl.h",
+               [!(x32 || musl || gnu || l4re)]: "sys/sysctl.h",
                // <execinfo.h> is not supported by musl:
                // https://www.openwall.com/lists/musl/2015/04/09/3
                // <execinfo.h> is not present on uclibc.
@@ -3723,11 +3739,11 @@ fn test_linux(target: &str) {
     // Include linux headers at the end:
     headers! {
         cfg:
-        [loongarch64 || riscv64]: "asm/hwcap.h",
-        "asm/mman.h",
+        [(loongarch64 || riscv64) && !l4re]: "asm/hwcap.h",
+        [!l4re]: "asm/mman.h",
     }
 
-    if !wasm32 {
+    if !wasm32 && !l4re {
         headers! { cfg:
             [gnu]: "linux/aio_abi.h",
             "linux/can.h",
@@ -3745,7 +3761,6 @@ fn test_linux(target: &str) {
             "linux/if.h",
             "linux/if_addr.h",
             "linux/if_alg.h",
-            "linux/if_ether.h",
             "linux/if_packet.h",
             "linux/if_tun.h",
             "linux/if_xdp.h",
@@ -3792,7 +3807,6 @@ fn test_linux(target: &str) {
             "linux/wait.h",
             "linux/wireless.h",
             "sys/fanotify.h",
-            // <sys/auxv.h> is not present on uclibc
             [!uclibc]: "sys/auxv.h",
             [gnu || musl]: "linux/close_range.h",
         }
@@ -3801,7 +3815,7 @@ fn test_linux(target: &str) {
     // note: aio.h must be included before sys/mount.h
     headers! {
         cfg:
-        "sys/xattr.h",
+        [!l4re]: "sys/xattr.h",
         "sys/sysinfo.h",
         // AIO is not supported by uclibc:
         [!uclibc]: "aio.h",
@@ -3831,10 +3845,11 @@ fn test_linux(target: &str) {
 
     cfg.rename_type(move |ty| {
         match ty {
-            "Ioctl" if gnu => Some("unsigned long".to_string()),
+            "Ioctl" if gnu || uclibc => Some("unsigned long".to_string()),
             "Ioctl" => Some("int".to_string()),
             // LFS64 types have been removed in musl 1.2.4+
             "off64_t" if musl => Some("off_t".to_string()),
+            "fsword_t" if uclibc => Some("__SWORD_TYPE".to_string()),
             _ => None,
         }
     });
@@ -4090,6 +4105,13 @@ fn test_linux(target: &str) {
 
     cfg.skip_const(move |constant| {
         let name = constant.ident();
+
+        // L4Re requires a min stack size of 64k; that isn't defined in uClibc, but
+        // somewhere in the core libraries. uClibc wants 16k, but that's not enough.
+        if l4re && name == "PTHREAD_STACK_MIN" {
+            return true;
+        }
+
         if !gnu {
             // Skip definitions from the kernel on non-glibc Linux targets.
             // They're libc-independent, so we only need to check them on one
@@ -4269,7 +4291,7 @@ fn test_linux(target: &str) {
 
             // FIXME(musl): on musl the pthread types are defined a little differently
             // - these constants are used by the glibc implementation.
-            n if musl && n.contains("__SIZEOF_PTHREAD") => true,
+            n if (musl || uclibc) && n.contains("__SIZEOF_PTHREAD") => true,
 
             // FIXME(linux): It was extended to 4096 since glibc 2.31 (Linux 5.4).
             // We should do so after a while.
@@ -4856,7 +4878,9 @@ fn test_linux(target: &str) {
 
     ctest::generate_test(&mut cfg, "../src/lib.rs", "ctest_output.rs").unwrap();
 
-    test_linux_like_apis(target);
+    if !l4re {
+        test_linux_like_apis(target);
+    }
 }
 
 // This function tests APIs that are incompatible to test when other APIs