emscripten: Upgrade emsdk to 3.1.68

In line with commit rust-lang/rust@2c38ecf.

Notable changes:
- `time_t` changed to 64-bit.
  emscripten-core/emscripten@c8857a6

(backport <rust-lang#3962>)
(cherry picked from commit 3e82531)

Author: kleisauke

ci/emscripten.sh

@@ -2,9 +2,9 @@
 
 set -ex
 
-# FIXME: 3.1.21 removed a lot of header files (https://github.com/emscripten-core/emscripten/pull/17704).
-#        We have to tweak libc-test (and deprecate unsupported items, maybe) when updating emsdk.
-EMSDK_VERSION=3.1.20
+# Note: keep in sync with:
+# https://github.com/rust-lang/rust/blob/master/src/ci/docker/scripts/emscripten.sh
+EMSDK_VERSION=3.1.68
 
 git clone https://github.com/emscripten-core/emsdk.git /emsdk-portable
 cd /emsdk-portable

libc-test/build.rs

@@ -2874,7 +2874,7 @@ fn test_emscripten(target: &str) {
             // Just pass all these through, no need for a "struct" prefix
             "FILE" | "fd_set" | "Dl_info" | "DIR" => ty.to_string(),
 
-            // LFS64 types have been removed in Emscripten 3.1.44+
+            // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             "off64_t" => "off_t".to_string(),
 
@@ -2898,7 +2898,7 @@ fn test_emscripten(target: &str) {
             s if s.ends_with("_nsec") && struct_.starts_with("stat") => {
                 s.replace("e_nsec", ".tv_nsec")
             }
-            // FIXME: appears that `epoll_event.data` is an union
+            // Rust struct uses raw u64, rather than union
             "u64" if struct_ == "epoll_event" => "data.u64".to_string(),
             s => s.to_string(),
         }
@@ -2914,10 +2914,7 @@ fn test_emscripten(target: &str) {
             // https://github.com/emscripten-core/emscripten/issues/5033
             ty if ty.starts_with("epoll") => true,
 
-            // FIXME: The size has been changed due to musl's time64
-            "time_t" => true,
-
-            // LFS64 types have been removed in Emscripten 3.1.44+
+            // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             t => t.ends_with("64") || t.ends_with("64_t"),
         }
@@ -2926,30 +2923,19 @@ fn test_emscripten(target: &str) {
     cfg.skip_struct(move |ty| {
         match ty {
             // This is actually a union, not a struct
-            // FIXME: is this necessary?
             "sigval" => true,
 
-            // FIXME: It was removed in
-            // emscripten-core/emscripten@953e414
-            "pthread_mutexattr_t" => true,
-
             // FIXME: Investigate why the test fails.
             // Skip for now to unblock CI.
             "pthread_condattr_t" => true,
-
-            // FIXME: The size has been changed when upgraded to musl 1.2.2
-            "pthread_mutex_t" => true,
+            "pthread_mutexattr_t" => true,
 
             // No epoll support
             // https://github.com/emscripten-core/emscripten/issues/5033
             ty if ty.starts_with("epoll") => true,
             ty if ty.starts_with("signalfd") => true,
 
-            // FIXME: The size has been changed due to time64
-            "utimbuf" | "timeval" | "timespec" | "rusage" | "itimerval" | "sched_param"
-            | "stat" | "stat64" | "shmid_ds" | "msqid_ds" => true,
-
-            // LFS64 types have been removed in Emscripten 3.1.44+
+            // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             ty => ty.ends_with("64") || ty.ends_with("64_t"),
         }
@@ -2958,12 +2944,9 @@ fn test_emscripten(target: &str) {
     cfg.skip_fn(move |name| {
         match name {
             // Emscripten does not support fork/exec/wait or any kind of multi-process support
-            // https://github.com/emscripten-core/emscripten/blob/3.1.30/tools/system_libs.py#L973
+            // https://github.com/emscripten-core/emscripten/blob/3.1.68/tools/system_libs.py#L1100
             "execv" | "execve" | "execvp" | "execvpe" | "fexecve" | "wait4" => true,
 
-            // FIXME: Remove after emscripten-core/emscripten#18492 is released (> 3.1.30).
-            "clearenv" => true,
-
             _ => false,
         }
     });
@@ -2991,8 +2974,8 @@ fn test_emscripten(target: &str) {
             "USRQUOTA" | "GRPQUOTA" | "Q_GETFMT" | "Q_GETINFO" | "Q_SETINFO" | "Q_SYNC"
             | "Q_QUOTAON" | "Q_QUOTAOFF" | "Q_GETQUOTA" | "Q_SETQUOTA" => true,
 
-            // FIXME: `SYS_gettid` was removed in
-            // emscripten-core/emscripten@6d6474e
+            // `SYS_gettid` was removed in Emscripten v1.39.9
+            // https://github.com/emscripten-core/emscripten/pull/10439
             "SYS_gettid" => true,
 
             // No personality.h
@@ -3001,19 +2984,11 @@ fn test_emscripten(target: &str) {
             | "ADDR_LIMIT_32BIT" | "SHORT_INODE" | "WHOLE_SECONDS" | "STICKY_TIMEOUTS"
             | "ADDR_LIMIT_3GB" => true,
 
-            // FIXME: These values have been changed
-            | "POSIX_MADV_DONTNEED" // to 4
-            | "RLIMIT_NLIMITS" // to 16
-            | "RLIM_NLIMITS" // to 16
-            | "IPPROTO_MAX" // to 263
-            | "F_GETLK" // to 5
-            | "F_SETLK" // to 6
-            | "F_SETLKW" // to 7
-            | "O_TMPFILE" // to 65
-            | "SIG_IGN" // -1
-                => true,
+            // `SIG_IGN` has been changed to -2 since 1 is a valid function address
+            // https://github.com/emscripten-core/emscripten/pull/14883
+            "SIG_IGN" => true,
 
-            // LFS64 types have been removed in Emscripten 3.1.44+
+            // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             n if n.starts_with("RLIM64") => true,
 
@@ -3023,23 +2998,18 @@ fn test_emscripten(target: &str) {
 
     cfg.skip_field_type(move |struct_, field| {
         // This is a weird union, don't check the type.
-        // FIXME: is this necessary?
         (struct_ == "ifaddrs" && field == "ifa_ifu") ||
         // sighandler_t type is super weird
-        // FIXME: is this necessary?
         (struct_ == "sigaction" && field == "sa_sigaction") ||
         // sigval is actually a union, but we pretend it's a struct
-        // FIXME: is this necessary?
         (struct_ == "sigevent" && field == "sigev_value")
     });
 
     cfg.skip_field(move |struct_, field| {
         // this is actually a union on linux, so we can't represent it well and
         // just insert some padding.
-        // FIXME: is this necessary?
         (struct_ == "siginfo_t" && field == "_pad") ||
         // musl names this __dummy1 but it's still there
-        // FIXME: is this necessary?
         (struct_ == "glob_t" && field == "gl_flags") ||
         // FIXME: After musl 1.1.24, it have only one field `sched_priority`,
         // while other fields become reserved.
@@ -3051,7 +3021,6 @@ fn test_emscripten(target: &str) {
         ].contains(&field))
     });
 
-    // FIXME: test linux like
     cfg.generate("../src/lib.rs", "main.rs");
 }
 

src/unix/linux_like/emscripten/mod.rs

@@ -16,7 +16,7 @@ pub type loff_t = i64;
 pub type pthread_key_t = ::c_uint;
 
 pub type clock_t = c_long;
-pub type time_t = c_long;
+pub type time_t = i64;
 pub type suseconds_t = c_long;
 pub type ino_t = u64;
 pub type off_t = i64;
@@ -259,11 +259,8 @@ s! {
         pub shm_perm: ::ipc_perm,
         pub shm_segsz: ::size_t,
         pub shm_atime: ::time_t,
-        __unused1: ::c_int,
         pub shm_dtime: ::time_t,
-        __unused2: ::c_int,
         pub shm_ctime: ::time_t,
-        __unused3: ::c_int,
         pub shm_cpid: ::pid_t,
         pub shm_lpid: ::pid_t,
         pub shm_nattch: ::c_ulong,
@@ -274,11 +271,8 @@ s! {
     pub struct msqid_ds {
         pub msg_perm: ::ipc_perm,
         pub msg_stime: ::time_t,
-        __unused1: ::c_int,
         pub msg_rtime: ::time_t,
-        __unused2: ::c_int,
         pub msg_ctime: ::time_t,
-        __unused3: ::c_int,
         __msg_cbytes: ::c_ulong,
         pub msg_qnum: ::msgqnum_t,
         pub msg_qbytes: ::msglen_t,
@@ -1048,11 +1042,11 @@ pub const PTHREAD_STACK_MIN: ::size_t = 2048;
 pub const POSIX_FADV_DONTNEED: ::c_int = 4;
 pub const POSIX_FADV_NOREUSE: ::c_int = 5;
 
-pub const POSIX_MADV_DONTNEED: ::c_int = 0;
+pub const POSIX_MADV_DONTNEED: ::c_int = 4;
 
 pub const RLIM_INFINITY: ::rlim_t = !0;
 #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
-pub const RLIMIT_NLIMITS: ::c_int = 15;
+pub const RLIMIT_NLIMITS: ::c_int = 16;
 #[allow(deprecated)]
 #[deprecated(since = "0.2.64", note = "Not stable across OS versions")]
 pub const RLIM_NLIMITS: ::c_int = RLIMIT_NLIMITS;
@@ -1067,7 +1061,7 @@ pub const __SIZEOF_PTHREAD_CONDATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_MUTEXATTR_T: usize = 4;
 pub const __SIZEOF_PTHREAD_RWLOCKATTR_T: usize = 8;
 
-pub const CPU_SETSIZE: ::c_int = 128;
+pub const CPU_SETSIZE: ::c_int = 1024;
 
 pub const TCSANOW: ::c_int = 0;
 pub const TCSADRAIN: ::c_int = 1;
@@ -1169,14 +1163,14 @@ pub const B3500000: ::speed_t = 0o010016;
 pub const B4000000: ::speed_t = 0o010017;
 
 pub const SO_BINDTODEVICE: ::c_int = 25;
-pub const SO_TIMESTAMP: ::c_int = 29;
+pub const SO_TIMESTAMP: ::c_int = 63;
 pub const SO_MARK: ::c_int = 36;
 pub const SO_RXQ_OVFL: ::c_int = 40;
 pub const SO_PEEK_OFF: ::c_int = 42;
 pub const SO_BUSY_POLL: ::c_int = 46;
 
 pub const __SIZEOF_PTHREAD_RWLOCK_T: usize = 32;
-pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 28;
+pub const __SIZEOF_PTHREAD_MUTEX_T: usize = 24;
 
 pub const O_DIRECT: ::c_int = 0x4000;
 pub const O_DIRECTORY: ::c_int = 0x10000;
@@ -1227,7 +1221,7 @@ pub const SOCK_STREAM: ::c_int = 1;
 pub const SOCK_DGRAM: ::c_int = 2;
 pub const SOCK_SEQPACKET: ::c_int = 5;
 
-pub const IPPROTO_MAX: ::c_int = 256;
+pub const IPPROTO_MAX: ::c_int = 263;
 
 pub const SOL_SOCKET: ::c_int = 1;
 
@@ -1244,8 +1238,8 @@ pub const SO_LINGER: ::c_int = 13;
 pub const SO_REUSEPORT: ::c_int = 15;
 pub const SO_RCVLOWAT: ::c_int = 18;
 pub const SO_SNDLOWAT: ::c_int = 19;
-pub const SO_RCVTIMEO: ::c_int = 20;
-pub const SO_SNDTIMEO: ::c_int = 21;
+pub const SO_RCVTIMEO: ::c_int = 66;
+pub const SO_SNDTIMEO: ::c_int = 67;
 pub const SO_ACCEPTCONN: ::c_int = 30;
 
 pub const IPV6_RTHDR_LOOSE: ::c_int = 0;
@@ -1347,7 +1341,7 @@ pub const TIOCM_RNG: ::c_int = 0x080;
 pub const TIOCM_DSR: ::c_int = 0x100;
 pub const TIOCM_CD: ::c_int = TIOCM_CAR;
 pub const TIOCM_RI: ::c_int = TIOCM_RNG;
-pub const O_TMPFILE: ::c_int = 0x400000;
+pub const O_TMPFILE: ::c_int = 0x410000;
 
 pub const MAX_ADDR_LEN: usize = 7;
 pub const ARPD_UPDATE: ::c_ushort = 0x01;