diff --git a/compiler-rt/lib/asan/asan_rtl.cc b/compiler-rt/lib/asan/asan_rtl.cc
index 26c5b072208c..b4ced16d20d1 100644
--- a/compiler-rt/lib/asan/asan_rtl.cc
+++ b/compiler-rt/lib/asan/asan_rtl.cc
@@ -524,7 +524,7 @@ void __asan_init() {
       0, true, 0, &create_main_args);
   CHECK_EQ(0, main_tid);
   SetCurrentThread(main_thread);
-  main_thread->ThreadStart(GetPid());
+  main_thread->ThreadStart(internal_getpid());
   force_interface_symbols();  // no-op.
 
   InitializeAllocator();
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.cc b/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
index 3684e847c812..abbe5f92d1a9 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.cc
@@ -35,7 +35,7 @@ fd_t report_fd = kStderrFd;
 static char report_path_prefix[4096];  // Set via __sanitizer_set_report_path.
 // PID of process that opened |report_fd|. If a fork() occurs, the PID of the
 // child thread will be different from |report_fd_pid|.
-static int report_fd_pid = 0;
+static uptr report_fd_pid = 0;
 
 static void (*DieCallback)(void);
 void SetDieCallback(void (*callback)(void)) {
@@ -65,10 +65,10 @@ void NORETURN CheckFailed(const char *file, int line, const char *cond,
 }
 
 void MaybeOpenReportFile() {
-  if (!log_to_file || (report_fd_pid == GetPid())) return;
+  if (!log_to_file || (report_fd_pid == internal_getpid())) return;
   InternalScopedBuffer<char> report_path_full(4096);
   internal_snprintf(report_path_full.data(), report_path_full.size(),
-                    "%s.%d", report_path_prefix, GetPid());
+                    "%s.%d", report_path_prefix, internal_getpid());
   uptr openrv = OpenFile(report_path_full.data(), true);
   if (internal_iserror(openrv)) {
     report_fd = kStderrFd;
@@ -81,7 +81,7 @@ void MaybeOpenReportFile() {
     internal_close(report_fd);
   }
   report_fd = openrv;
-  report_fd_pid = GetPid();
+  report_fd_pid = internal_getpid();
 }
 
 void RawWrite(const char *buffer) {
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common.h b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
index f0208f33333a..d800360169fb 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common.h
@@ -40,7 +40,6 @@ uptr GetPageSize();
 uptr GetPageSizeCached();
 uptr GetMmapGranularity();
 // Threads
-int GetPid();
 uptr GetTid();
 uptr GetThreadSelf();
 void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_libc.h b/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
index 5f77ad1e5cff..82d809a0305a 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_libc.h
@@ -85,6 +85,7 @@ uptr internal_lseek(fd_t fd, OFF_T offset, int whence);
 
 uptr internal_ptrace(int request, int pid, void *addr, void *data);
 uptr internal_waitpid(int pid, int *status, int options);
+uptr internal_getpid();
 uptr internal_getppid();
 
 // Threading
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
index 0181b69e8026..9d74a48f5356 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
@@ -115,6 +115,10 @@ void internal__exit(int exitcode) {
   _exit(exitcode);
 }
 
+uptr internal_getpid() {
+  return getpid();
+}
+
 // ----------------- sanitizer_common.h
 bool FileExists(const char *filename) {
   struct stat st;
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
index 1bc99081a6b4..72dde4cd7e76 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix.cc
@@ -43,10 +43,6 @@ uptr GetMmapGranularity() {
   return GetPageSize();
 }
 
-int GetPid() {
-  return getpid();
-}
-
 u32 GetUid() {
   return getuid();
 }
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc b/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
index ebb8fa07a131..5935d7f17a5e 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_printf.cc
@@ -218,7 +218,7 @@ static void SharedPrintfCode(bool append_pid, const char *format,
     }
     needed_length = 0;
     if (append_pid) {
-      int pid = GetPid();
+      int pid = internal_getpid();
       needed_length += internal_snprintf(buffer, buffer_size, "==%d==", pid);
       if (needed_length >= buffer_size) {
         // The pid doesn't fit into the current buffer.
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
index b826cb2f4287..e76f1d1f7fa6 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_win.cc
@@ -44,7 +44,7 @@ bool FileExists(const char *filename) {
   UNIMPLEMENTED();
 }
 
-int GetPid() {
+uptr internal_getpid() {
   return GetProcessId(GetCurrentProcess());
 }
 
diff --git a/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc b/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
index c7651c67bf9e..f18b26f6abe4 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_interceptors.cc
@@ -1754,11 +1754,11 @@ TSAN_INTERCEPTOR(int, kill, int pid, int sig) {
   SignalContext *sctx = SigCtx(thr);
   CHECK_NE(sctx, 0);
   int prev = sctx->int_signal_send;
-  if (pid == GetPid()) {
+  if (pid == (int)internal_getpid()) {
     sctx->int_signal_send = sig;
   }
   int res = REAL(kill)(pid, sig);
-  if (pid == GetPid()) {
+  if (pid == (int)internal_getpid()) {
     CHECK_EQ(sctx->int_signal_send, sig);
     sctx->int_signal_send = prev;
   }
diff --git a/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cc b/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cc
index 257afcf8fa35..04b4b455d15e 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_interface_ann.cc
@@ -196,7 +196,7 @@ void PrintMatchedBenignRaces() {
       &ExpectRace::addcount);
   if (hit_matched.Size()) {
     Printf("ThreadSanitizer: Matched %d \"benign\" races (pid=%d):\n",
-        hit_count, GetPid());
+        hit_count, (int)internal_getpid());
     for (uptr i = 0; i < hit_matched.Size(); i++) {
       Printf("%d %s:%d %s\n",
           hit_matched[i].hitcount, hit_matched[i].file,
@@ -206,7 +206,7 @@ void PrintMatchedBenignRaces() {
   if (hit_matched.Size()) {
     Printf("ThreadSanitizer: Annotated %d \"benign\" races, %d unique"
            " (pid=%d):\n",
-        add_count, unique_count, GetPid());
+        add_count, unique_count, (int)internal_getpid());
     for (uptr i = 0; i < add_matched.Size(); i++) {
       Printf("%d %s:%d %s\n",
           add_matched[i].addcount, add_matched[i].file,
diff --git a/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc b/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
index 5ccdc49d37d2..a0d71e8589d6 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
@@ -176,8 +176,8 @@ static void MapRodata() {
   if (tmpdir == 0)
     return;
   char filename[256];
-  internal_snprintf(filename, sizeof(filename), "%s/tsan.rodata.%u",
-                    tmpdir, GetPid());
+  internal_snprintf(filename, sizeof(filename), "%s/tsan.rodata.%d",
+                    tmpdir, (int)internal_getpid());
   uptr openrv = internal_open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
   if (internal_iserror(openrv))
     return;
diff --git a/compiler-rt/lib/tsan/rtl/tsan_report.cc b/compiler-rt/lib/tsan/rtl/tsan_report.cc
index bfa266021897..c95c5c86be69 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_report.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_report.cc
@@ -179,7 +179,8 @@ ReportStack *SkipTsanInternalFrames(ReportStack *ent) {
 void PrintReport(const ReportDesc *rep) {
   Printf("==================\n");
   const char *rep_typ_str = ReportTypeString(rep->typ);
-  Printf("WARNING: ThreadSanitizer: %s (pid=%d)\n", rep_typ_str, GetPid());
+  Printf("WARNING: ThreadSanitizer: %s (pid=%d)\n", rep_typ_str,
+         (int)internal_getpid());
 
   for (uptr i = 0; i < rep->stacks.Size(); i++) {
     if (i)
diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
index c51a5669060e..66b23fe1bc21 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl.cc
@@ -120,7 +120,7 @@ static void BackgroundThread(void *arg) {
   if (flags()->profile_memory && flags()->profile_memory[0]) {
     InternalScopedBuffer<char> filename(4096);
     internal_snprintf(filename.data(), filename.size(), "%s.%d",
-        flags()->profile_memory, GetPid());
+        flags()->profile_memory, (int)internal_getpid());
     uptr openrv = OpenFile(filename.data(), true);
     if (internal_iserror(openrv)) {
       Printf("ThreadSanitizer: failed to open memory profile file '%s'\n",
@@ -229,19 +229,19 @@ void Initialize(ThreadState *thr) {
 
   if (ctx->flags.verbosity)
     Printf("***** Running under ThreadSanitizer v2 (pid %d) *****\n",
-               GetPid());
+           (int)internal_getpid());
 
   // Initialize thread 0.
   int tid = ThreadCreate(thr, 0, 0, true);
   CHECK_EQ(tid, 0);
-  ThreadStart(thr, tid, GetPid());
+  ThreadStart(thr, tid, internal_getpid());
   CHECK_EQ(thr->in_rtl, 1);
   ctx->initialized = true;
 
   if (flags()->stop_on_start) {
     Printf("ThreadSanitizer is suspended at startup (pid %d)."
            " Call __tsan_resume().\n",
-           GetPid());
+           (int)internal_getpid());
     while (__tsan_resumed == 0) {}
   }
 }
diff --git a/compiler-rt/lib/tsan/rtl/tsan_suppressions.cc b/compiler-rt/lib/tsan/rtl/tsan_suppressions.cc
index 14b6a3acaccd..6c49355bed88 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_suppressions.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_suppressions.cc
@@ -194,7 +194,7 @@ void PrintMatchedSuppressions() {
   if (hit_count == 0)
     return;
   Printf("ThreadSanitizer: Matched %d suppressions (pid=%d):\n",
-      hit_count, GetPid());
+      hit_count, (int)internal_getpid());
   for (Suppression *supp = g_suppressions; supp; supp = supp->next) {
     if (supp->hit_count == 0)
       continue;
diff --git a/compiler-rt/lib/tsan/rtl/tsan_symbolize_addr2line_linux.cc b/compiler-rt/lib/tsan/rtl/tsan_symbolize_addr2line_linux.cc
index 76926e2b5aaf..47f9e1fbf418 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_symbolize_addr2line_linux.cc
+++ b/compiler-rt/lib/tsan/rtl/tsan_symbolize_addr2line_linux.cc
@@ -87,7 +87,8 @@ static int dl_iterate_phdr_cb(dl_phdr_info *info, size_t size, void *arg) {
   DlIteratePhdrCtx *ctx = (DlIteratePhdrCtx*)arg;
   InternalScopedBuffer<char> tmp(128);
   if (ctx->is_first) {
-    internal_snprintf(tmp.data(), tmp.size(), "/proc/%d/exe", GetPid());
+    internal_snprintf(tmp.data(), tmp.size(), "/proc/%d/exe",
+                      (int)internal_getpid());
     info->dlpi_name = tmp.data();
   }
   ctx->is_first = false;