[tsan] Fix build warnings on OS X

[kubamracek]

Summary

Building tsan_interceptors.cc on OS X produces a bunch of warnings about unused constants and functions. Let's fix them.

lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_RAND_R \
   SI_FREEBSD || SI_MAC || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_ICONV SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_TIMES SI_NOT_WINDOWS
 
 // FIXME: getline seems to be available on OSX 10.7
 #define SANITIZER_INTERCEPT_GETLINE SI_FREEBSD || SI_LINUX_NOT_ANDROID
 
-#define SANITIZER_INTERCEPT__EXIT SI_LINUX || SI_FREEBSD
+#define SANITIZER_INTERCEPT__EXIT SI_LINUX || SI_FREEBSD || SI_MAC
 
 #define SANITIZER_INTERCEPT_PHTREAD_MUTEX SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_PTHREAD_SETNAME_NP \
   SI_FREEBSD || SI_LINUX_NOT_ANDROID
 
 #define SANITIZER_INTERCEPT_TLS_GET_ADDR \
   SI_FREEBSD || SI_LINUX_NOT_ANDROID
 

lib/tsan/rtl/tsan_interceptors.cc

 extern "C" int mallopt(int param, int value);
 #endif
 extern __sanitizer_FILE *stdout, *stderr;
 const int PTHREAD_MUTEX_RECURSIVE = 1;
 const int PTHREAD_MUTEX_RECURSIVE_NP = 1;
 const int EINVAL = 22;
 const int EBUSY = 16;
 const int EOWNERDEAD = 130;
+#if !SANITIZER_MAC
 const int EPOLL_CTL_ADD = 1;
+#endif
 const int SIGILL = 4;
 const int SIGABRT = 6;
 const int SIGFPE = 8;
 const int SIGSEGV = 11;
 const int SIGPIPE = 13;
 const int SIGTERM = 15;
 #ifdef __mips__
 const int SIGBUS = 10;
 const int SIGSYS = 12;
 #else
 const int SIGBUS = 7;
 const int SIGSYS = 31;
 #endif
 void *const MAP_FAILED = (void*)-1;
+#if !SANITIZER_MAC
 const int PTHREAD_BARRIER_SERIAL_THREAD = -1;
+#endif
 const int MAP_FIXED = 0x10;
 typedef long long_t;  // NOLINT
 
 // From /usr/include/unistd.h
 # define F_ULOCK 0      /* Unlock a previously locked region.  */
 # define F_LOCK  1      /* Lock a region for exclusive use.  */
 # define F_TLOCK 2      /* Test and lock a region for exclusive use.  */
 # define F_TEST  3      /* Test a region for other processes locks.  */
static int setup_at_exit_wrapper(ThreadState *thr, uptr pc, void(*f)(),
   // Memory allocation in __cxa_atexit will race with free during exit,
   // because we do not see synchronization around atexit callback list.
   ThreadIgnoreBegin(thr, pc);
   int res = REAL(__cxa_atexit)(at_exit_wrapper, ctx, dso);
   ThreadIgnoreEnd(thr, pc);
   return res;
 }
 
+#if !SANITIZER_MAC
 static void on_exit_wrapper(int status, void *arg) {
   ThreadState *thr = cur_thread();
   uptr pc = 0;
   Acquire(thr, pc, (uptr)arg);
   AtExitCtx *ctx = (AtExitCtx*)arg;
   ((void(*)(int status, void *arg))ctx->f)(status, ctx->arg);
   __libc_free(ctx);
 }
 
-#if !SANITIZER_MAC
 TSAN_INTERCEPTOR(int, on_exit, void(*f)(int, void*), void *arg) {
   if (cur_thread()->in_symbolizer)
     return 0;
   SCOPED_TSAN_INTERCEPTOR(on_exit, f, arg);
   AtExitCtx *ctx = (AtExitCtx*)__libc_malloc(sizeof(AtExitCtx));
   ctx->f = (void(*)())f;
   ctx->arg = arg;
   Release(thr, pc, (uptr)ctx);

 }
 
 struct TsanInterceptorContext {
   ThreadState *thr;
   const uptr caller_pc;
   const uptr pc;
 };
 
+#if !SANITIZER_MAC
 static void HandleRecvmsg(ThreadState *thr, uptr pc,
     __sanitizer_msghdr *msg) {
   int fds[64];
   int cnt = ExtractRecvmsgFDs(msg, fds, ARRAY_SIZE(fds));
   for (int i = 0; i < cnt; i++)
     FdEventCreate(thr, pc, fds[i]);
 }
+#endif
 
 #include "sanitizer_common/sanitizer_platform_interceptors.h"
 // Causes interceptor recursion (getaddrinfo() and fopen())
 #undef SANITIZER_INTERCEPT_GETADDRINFO
 // There interceptors do not seem to be strictly necessary for tsan.
 // But we see cases where the interceptors consume 70% of execution time.
 // Memory blocks passed to fgetgrent_r are "written to" by tsan several times.
 // First, there is some recursion (getgrnam_r calls fgetgrent_r), and each
explicit ScopedSyscall(ThreadState *thr)
     Initialize(thr);
   }
 
   ~ScopedSyscall() {
     ProcessPendingSignals(thr);
   }
 };
 
+#if !SANITIZER_MAC
 static void syscall_access_range(uptr pc, uptr p, uptr s, bool write) {
   TSAN_SYSCALL();
   MemoryAccessRange(thr, pc, p, s, write);
 }
 
 static void syscall_acquire(uptr pc, uptr addr) {
   TSAN_SYSCALL();
   Acquire(thr, pc, addr);
static void syscall_post_fork(uptr pc, int pid) {
   } else if (pid > 0) {
     // parent
     ForkParentAfter(thr, pc);
   } else {
     // error
     ForkParentAfter(thr, pc);
   }
 }
+#endif
 
 #define COMMON_SYSCALL_PRE_READ_RANGE(p, s) \
   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), false)
 
 #define COMMON_SYSCALL_PRE_WRITE_RANGE(p, s) \
   syscall_access_range(GET_CALLER_PC(), (uptr)(p), (uptr)(s), true)
 
 #define COMMON_SYSCALL_POST_READ_RANGE(p, s) \
static void finalize(void *arg) {
   ThreadState *thr = cur_thread();
   int status = Finalize(thr);
   // Make sure the output is not lost.
   FlushStreams();
   if (status)
     Die();
 }
 
+#if !SANITIZER_MAC
 static void unreachable() {
   Report("FATAL: ThreadSanitizer: unreachable called\n");
   Die();
 }
+#endif
 
 void InitializeInterceptors() {
 #if !SANITIZER_MAC
   // We need to setup it early, because functions like dlsym() can call it.
   REAL(memset) = internal_memset;
   REAL(memcpy) = internal_memcpy;
 #endif