Fix linking to 64-bit time_t versions of functions on musl

musl switched to 64-bit time_t across all architectures in version
1.2.0:

https://musl.libc.org/time64.html

This change was done in a way which attempted to preserve ABI
compatibility. To achieve this, the 32-bit versions of functions were
left at their original names in the compiled library, and new 64-bit
versions of functions were introduced. The header files then
redirected calls to the standard function names to use the new 64-bit
versions using the __asm__("name") construct, which is similar to D's
pragma(mangle, "name").

This change is a fix-up for commit
ca0b670, which tried addressing this
change in musl by changing time_t to 64-bit when targeting new musl
versions (the default). However, that change was incomplete, as it did
not implement the function redirection part of the change, which is
required to actually call the implementations using 64-bit time_t. As
a result, it caused programs to link but return incorrect results at
runtime on 32-bit architectures when targeting new musl versions.

Fix this by adjusting the mangled name of the D declarations of
affected functions when targeting musl on 32-bit platforms.  Affected
functions in musl can be found by grepping for _REDIR_TIME64 and uses
of the __REDIR macro.

druntime/src/core/stdc/config.d

@@ -290,3 +290,28 @@ alias c_complex_float = __c_complex_float;
 alias c_complex_double = __c_complex_double;
 alias c_complex_real = __c_complex_real;
 }
+
+
+// Returns the mangled name for the 64-bit time_t versions of
+// functions affected by musl's transition to 64-bit time_t.
+// https://musl.libc.org/time64.html
+version (CRuntime_Musl)
+{
+    version (CRuntime_Musl_Pre_Time64)
+        enum muslRedirTime64 = false;
+    else
+    {
+        // time_t was defined as a C long in older Musl versions.
+        enum muslRedirTime64 = (c_long.sizeof == 4);
+    }
+}
+else
+    enum muslRedirTime64 = false;
+
+package(core) template muslRedirTime64Mangle(string name, string redirectedName)
+{
+    static if (muslRedirTime64)
+        enum muslRedirTime64Mangle = redirectedName;
+    else
+        enum muslRedirTime64Mangle = name;
+}

druntime/src/core/stdc/time.d

@@ -30,19 +30,25 @@ nothrow:
 @nogc:
 
 ///
+pragma(mangle, muslRedirTime64Mangle!("difftime", "__difftime64"))
 pure double  difftime(time_t time1, time_t time0); // MT-Safe
 ///
+pragma(mangle, muslRedirTime64Mangle!("mktime", "__mktime64"))
 @system time_t  mktime(scope tm* timeptr); // @system: MT-Safe env locale
 ///
+pragma(mangle, muslRedirTime64Mangle!("time", "__time64"))
 time_t  time(scope time_t* timer);
 
 ///
 @system char*   asctime(const scope tm* timeptr); // @system: MT-Unsafe race:asctime locale
 ///
+pragma(mangle, muslRedirTime64Mangle!("ctime", "__ctime64"))
 @system char*   ctime(const scope time_t* timer); // @system: MT-Unsafe race:tmbuf race:asctime env locale
 ///
+pragma(mangle, muslRedirTime64Mangle!("gmtime", "__gmtime64"))
 @system tm*     gmtime(const scope time_t* timer); // @system: MT-Unsafe race:tmbuf env locale
 ///
+pragma(mangle, muslRedirTime64Mangle!("localtime", "__localtime64"))
 @system tm*     localtime(const scope time_t* timer); // @system: MT-Unsafe race:tmbuf env locale
 ///
 @system size_t  strftime(scope char* s, size_t maxsize, const scope char* format, const scope tm* timeptr); // @system: MT-Safe env locale

druntime/src/core/sys/posix/aio.d

@@ -8,6 +8,7 @@
  */
 module core.sys.posix.aio;
 
+import core.stdc.config;
 import core.sys.posix.signal;
 import core.sys.posix.sys.types;
 
@@ -392,6 +393,7 @@ else
     int aio_fsync(int op, aiocb* aiocbp);
     int aio_error(const(aiocb)* aiocbp);
     ssize_t aio_return(aiocb* aiocbp);
+    pragma(mangle, muslRedirTime64Mangle!("aio_suspend", "__aio_suspend_time64"))
     int aio_suspend(const(aiocb*)* aiocb_list, int nitems, const(timespec)* timeout);
     int aio_cancel(int fd, aiocb* aiocbp);
     int lio_listio(int mode, const(aiocb*)* aiocb_list, int nitems, sigevent* sevp);

druntime/src/core/sys/posix/dlfcn.d

@@ -177,6 +177,38 @@ version (CRuntime_Glibc)
         void* dli_saddr;
     }
 }
+else
+version (CRuntime_Musl)
+{
+    enum RTLD_LAZY   = 1;
+    enum RTLD_NOW    = 2;
+    enum RTLD_NOLOAD = 4;
+    enum RTLD_NODELETE = 4096;
+    enum RTLD_GLOBAL = 256;
+    enum RTLD_LOCAL  = 0;
+
+    enum RTLD_NEXT    = cast(void *)-1;
+    enum RTLD_DEFAULT = cast(void *)0;
+
+    enum RTLD_DI_LINKMAP = 2;
+
+    int    dlclose(void *);
+    char  *dlerror();
+    void  *dlopen(const(char) *, int);
+
+    pragma(mangle, muslRedirTime64Mangle!("dlsym", "__dlsym_time64"))
+    void  *dlsym(void *__restrict, const(char) *__restrict);
+
+    struct Dl_info
+    {
+        const(char)* dli_fname;
+        void* dli_fbase;
+        const(char)* dli_sname;
+        void* dli_saddr;
+    }
+    int dladdr(const(void) *, Dl_info *);
+    int dlinfo(void *, int, void *);
+}
 else version (Darwin)
 {
     enum RTLD_LAZY      = 0x00001;

druntime/src/core/sys/posix/mqueue.d

@@ -178,6 +178,7 @@ ssize_t mq_receive (mqd_t mqdes, char* msg_ptr, size_t msg_len, uint* msg_prio);
  *   On success, mq_receive() returns the number of bytes in the received
  *   message; on error, -1 is returned, with errno set to indicate the error
  */
+pragma(mangle, muslRedirTime64Mangle!("mq_timedreceive", "__mq_timedreceive_time64"))
 ssize_t mq_timedreceive (mqd_t mqdes, char* msg_ptr, size_t msg_len,
                          uint* msg_prio, const(timespec)* abs_timeout);
 
@@ -216,5 +217,6 @@ int mq_send (mqd_t mqdes, const(char)* msg_ptr, size_t msg_len, uint msg_prio);
  *   with errno set to indicate the error.
  *
  */
+pragma(mangle, muslRedirTime64Mangle!("mq_timedsend", "__mq_timedsend_time64"))
 int mq_timedsend (mqd_t mqdes, const(char)* msg_ptr, size_t msg_len,
                    uint msg_prio, const(timespec)* abs_timeout);

druntime/src/core/sys/posix/sched.d

@@ -65,7 +65,10 @@ version (linux)
         {
             int sched_priority;
             int __reserved1;
-            timespec[2] __reserved2;
+            static if (muslRedirTime64)
+                c_long[2] __reserved2;
+            else
+                timespec[2] __reserved2;
             int __reserved3;
         }
     }
@@ -282,6 +285,7 @@ else version (CRuntime_Musl)
 {
     int sched_get_priority_max(int);
     int sched_get_priority_min(int);
+    pragma(mangle, muslRedirTime64Mangle!("sched_rr_get_interval", "__sched_rr_get_interval_time64"))
     int sched_rr_get_interval(pid_t, timespec*);
 }
 else version (CRuntime_UClibc)

druntime/src/core/sys/posix/semaphore.d

@@ -216,6 +216,7 @@ else version (CRuntime_Bionic)
 }
 else version (CRuntime_Musl)
 {
+    pragma(mangle, muslRedirTime64Mangle!("sem_timedwait", "__sem_timedwait_time64"))
     int sem_timedwait(sem_t*, const scope timespec*);
 }
 else version (CRuntime_UClibc)

druntime/src/core/sys/posix/signal.d

@@ -2990,6 +2990,7 @@ else version (CRuntime_Bionic)
 else version (CRuntime_Musl)
 {
     int sigqueue(pid_t, int, const sigval);
+    pragma(mangle, muslRedirTime64Mangle!("sigtimedwait", "__sigtimedwait_time64"))
     int sigtimedwait(const scope sigset_t*, siginfo_t*, const scope timespec*);
     int sigwaitinfo(const scope sigset_t*, siginfo_t*);
 }

druntime/src/core/sys/posix/sys/resource.d

@@ -547,6 +547,7 @@ else version (CRuntime_Musl)
     int setrlimit(int, const scope rlimit*);
     alias getrlimit getrlimit64;
     alias setrlimit setrlimit64;
+    pragma(mangle, muslRedirTime64Mangle!("getrusage", "__getrusage_time64"))
     int getrusage(int, rusage*);
 }
 else version (Solaris)

druntime/src/core/sys/posix/sys/select.d

@@ -501,7 +501,9 @@ else version (CRuntime_Musl)
     {
         fdset.fds_bits[0 .. $] = 0;
     }
+    pragma(mangle, muslRedirTime64Mangle!("pselect", "__pselect_time64"))
     int pselect(int, fd_set*, fd_set*, fd_set*, const scope timespec*, const scope sigset_t*);
+    pragma(mangle, muslRedirTime64Mangle!("select", "__select_time64"))
     int select(int, fd_set*, fd_set*, fd_set*, timeval*);
 }
 else version (CRuntime_UClibc)

druntime/src/core/sys/posix/sys/stat.d

@@ -1890,8 +1890,11 @@ else version (CRuntime_Bionic)
 }
 else version (CRuntime_Musl)
 {
+    pragma(mangle, muslRedirTime64Mangle!("stat", "__stat_time64"))
     int stat(const scope char*, stat_t*);
+    pragma(mangle, muslRedirTime64Mangle!("fstat", "__fstat_time64"))
     int fstat(int, stat_t*);
+    pragma(mangle, muslRedirTime64Mangle!("lstat", "__lstat_time64"))
     int lstat(const scope char*, stat_t*);
 
     alias fstat fstat64;

druntime/src/core/sys/posix/sys/time.d

@@ -89,7 +89,9 @@ else version (CRuntime_Musl)
         time_t      tv_sec;
         suseconds_t tv_usec;
     }
+    pragma(mangle, muslRedirTime64Mangle!("gettimeofday", "__gettimeofday_time64"))
     int gettimeofday(timeval*, void*);
+    pragma(mangle, muslRedirTime64Mangle!("utimes", "__utimes_time64"))
     int utimes(const scope char*, ref const(timeval)[2]);
 }
 else version (Darwin)

druntime/src/core/sys/posix/time.d

@@ -83,6 +83,7 @@ else version (CRuntime_Bionic)
 }
 else version (CRuntime_Musl)
 {
+    pragma(mangle, muslRedirTime64Mangle!("timegm", "__timegm_time64"))
     time_t timegm(tm*);
 }
 else version (CRuntime_UClibc)
@@ -483,15 +484,21 @@ else version (CRuntime_Musl)
 
     int nanosleep(const scope timespec*, timespec*);
 
+    pragma(mangle, muslRedirTime64Mangle!("clock_getres", "__clock_getres_time64"))
     int clock_getres(clockid_t, timespec*);
+    pragma(mangle, muslRedirTime64Mangle!("clock_gettime", "__clock_gettime64"))
     int clock_gettime(clockid_t, timespec*);
+    pragma(mangle, muslRedirTime64Mangle!("clock_settime", "__clock_settime64"))
     int clock_settime(clockid_t, const scope timespec*);
+    pragma(mangle, muslRedirTime64Mangle!("clock_nanosleep", "__clock_nanosleep_time64"))
     int clock_nanosleep(clockid_t, int, const scope timespec*, timespec*);
     int clock_getcpuclockid(pid_t, clockid_t *);
 
     int timer_create(clockid_t, sigevent*, timer_t*);
     int timer_delete(timer_t);
+    pragma(mangle, muslRedirTime64Mangle!("timer_gettime", "__timer_gettime64"))
     int timer_gettime(timer_t, itimerspec*);
+    pragma(mangle, muslRedirTime64Mangle!("timer_settime", "__timer_settime64"))
     int timer_settime(timer_t, int, const scope itimerspec*, itimerspec*);
     int timer_getoverrun(timer_t);
 }
@@ -596,8 +603,11 @@ else version (CRuntime_Bionic)
 else version (CRuntime_Musl)
 {
     char* asctime_r(const scope tm*, char*);
+    pragma(mangle, muslRedirTime64Mangle!("ctime_r", "__ctime64_r"))
     char* ctime_r(const scope time_t*, char*);
+    pragma(mangle, muslRedirTime64Mangle!("gmtime_r", "__gmtime64_r"))
     tm*   gmtime_r(const scope time_t*, tm*);
+    pragma(mangle, muslRedirTime64Mangle!("localtime_r", "__localtime64_r"))
     tm*   localtime_r(const scope time_t*, tm*);
 }
 else version (CRuntime_UClibc)

druntime/src/core/sys/posix/utime.d

@@ -62,6 +62,7 @@ else version (CRuntime_Musl)
         time_t  modtime;
     }
 
+    pragma(mangle, muslRedirTime64Mangle!("utime", "__utime64"))
     int utime(const scope char*, const scope utimbuf*);
 }
 else version (Darwin)