diff --git a/compiler-rt/lib/asan/asan_fuchsia.cpp b/compiler-rt/lib/asan/asan_fuchsia.cpp
--- a/compiler-rt/lib/asan/asan_fuchsia.cpp
+++ b/compiler-rt/lib/asan/asan_fuchsia.cpp
@@ -14,16 +14,17 @@
 #include "sanitizer_common/sanitizer_fuchsia.h"
 #if SANITIZER_FUCHSIA
 
-#include "asan_interceptors.h"
-#include "asan_internal.h"
-#include "asan_stack.h"
-#include "asan_thread.h"
-
 #include <limits.h>
 #include <zircon/sanitizer.h>
 #include <zircon/syscalls.h>
 #include <zircon/threads.h>
 
+#include "asan_interceptors.h"
+#include "asan_internal.h"
+#include "asan_stack.h"
+#include "asan_thread.h"
+#include "lsan/lsan_common.h"
+
 namespace __asan {
 
 // The system already set up the shadow memory for us.
@@ -31,7 +32,8 @@
 // AsanInitInternal->InitializeHighMemEnd (asan_rtl.cpp).
 // Just do some additional sanity checks here.
 void InitializeShadowMemory() {
-  if (Verbosity()) PrintAddressSpaceLayout();
+  if (Verbosity())
+    PrintAddressSpaceLayout();
 
   // Make sure SHADOW_OFFSET doesn't use __asan_shadow_memory_dynamic_address.
   __asan_shadow_memory_dynamic_address = kDefaultShadowSentinel;
@@ -148,7 +150,8 @@
                                     uptr stack_size) {
   EnsureMainThreadIDIsCorrect();
   // Strict init-order checking is thread-hostile.
-  if (flags()->strict_init_order) StopInitOrderChecking();
+  if (flags()->strict_init_order)
+    StopInitOrderChecking();
 
   GET_STACK_TRACE_THREAD;
   u32 parent_tid = GetCurrentTidOrInvalid();
@@ -202,8 +205,18 @@
   __sanitizer_fill_shadow(p, size, 0, 0);
 }
 
+// On Fuchsia, leak detection is done by a special hook after atexit hooks.
+// So this doesn't install any atexit hook like on other platforms.
+void InstallAtExitCheckLeaks() {}
+
 }  // namespace __asan
 
+namespace __lsan {
+
+bool UseExitcodeOnLeak() { return __asan::flags()->halt_on_error; }
+
+}  // namespace __lsan
+
 // These are declared (in extern "C") by <zircon/sanitizer.h>.
 // The system runtime will call our definitions directly.
 
diff --git a/compiler-rt/lib/asan/asan_internal.h b/compiler-rt/lib/asan/asan_internal.h
--- a/compiler-rt/lib/asan/asan_internal.h
+++ b/compiler-rt/lib/asan/asan_internal.h
@@ -123,6 +123,8 @@
 // `dlopen()` specific initialization inside this function.
 bool HandleDlopenInit();
 
+void InstallAtExitCheckLeaks();
+
 // Add convenient macro for interface functions that may be represented as
 // weak hooks.
 #define ASAN_MALLOC_HOOK(ptr, size)                                   \
diff --git a/compiler-rt/lib/asan/asan_posix.cpp b/compiler-rt/lib/asan/asan_posix.cpp
--- a/compiler-rt/lib/asan/asan_posix.cpp
+++ b/compiler-rt/lib/asan/asan_posix.cpp
@@ -140,6 +140,18 @@
   AsanThread::TSDDtor(tsd);
 }
 #endif
+
+#if CAN_SANITIZE_LEAKS
+void InstallAtExitCheckLeaks() {
+  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
+    if (flags()->halt_on_error)
+      Atexit(__lsan::DoLeakCheck);
+    else
+      Atexit(__lsan::DoRecoverableLeakCheckVoid);
+  }
+}
+#endif
+
 }  // namespace __asan
 
 #endif  // SANITIZER_POSIX
diff --git a/compiler-rt/lib/asan/asan_rtl.cpp b/compiler-rt/lib/asan/asan_rtl.cpp
--- a/compiler-rt/lib/asan/asan_rtl.cpp
+++ b/compiler-rt/lib/asan/asan_rtl.cpp
@@ -500,12 +500,7 @@
 
   if (CAN_SANITIZE_LEAKS) {
     __lsan::InitCommonLsan();
-    if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
-      if (flags()->halt_on_error)
-        Atexit(__lsan::DoLeakCheck);
-      else
-        Atexit(__lsan::DoRecoverableLeakCheckVoid);
-    }
+    InstallAtExitCheckLeaks();
   }
 
 #if CAN_SANITIZE_UB
diff --git a/compiler-rt/lib/lsan/lsan.h b/compiler-rt/lib/lsan/lsan.h
--- a/compiler-rt/lib/lsan/lsan.h
+++ b/compiler-rt/lib/lsan/lsan.h
@@ -39,6 +39,7 @@
 void InitializeInterceptors();
 void ReplaceSystemMalloc();
 void LsanOnDeadlySignal(int signo, void *siginfo, void *context);
+void InstallAtExitCheckLeaks();
 
 #define ENSURE_LSAN_INITED do {   \
   CHECK(!lsan_init_is_running);   \
diff --git a/compiler-rt/lib/lsan/lsan.cpp b/compiler-rt/lib/lsan/lsan.cpp
--- a/compiler-rt/lib/lsan/lsan.cpp
+++ b/compiler-rt/lib/lsan/lsan.cpp
@@ -103,9 +103,7 @@
   InitializeThreadRegistry();
   InstallDeadlySignalHandlers(LsanOnDeadlySignal);
   InitializeMainThread();
-
-  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
-    Atexit(DoLeakCheck);
+  InstallAtExitCheckLeaks();
 
   InitializeCoverage(common_flags()->coverage, common_flags()->coverage_dir);
 
diff --git a/compiler-rt/lib/lsan/lsan_common_fuchsia.cpp b/compiler-rt/lib/lsan/lsan_common_fuchsia.cpp
--- a/compiler-rt/lib/lsan/lsan_common_fuchsia.cpp
+++ b/compiler-rt/lib/lsan/lsan_common_fuchsia.cpp
@@ -51,7 +51,16 @@
 // behavior and causes rare race conditions.
 void HandleLeaks() {}
 
+// This is defined differently in asan_fuchsiap.cpp and lsan_fuchsia.cpp.
+bool UseExitcodeOnLeak();
+
 int ExitHook(int status) {
+  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit) {
+    if (UseExitcodeOnLeak())
+      DoLeakCheck();
+    else
+      DoRecoverableLeakCheckVoid();
+  }
   return status == 0 && HasReportedLeaks() ? common_flags()->exitcode : status;
 }
 
diff --git a/compiler-rt/lib/lsan/lsan_fuchsia.cpp b/compiler-rt/lib/lsan/lsan_fuchsia.cpp
--- a/compiler-rt/lib/lsan/lsan_fuchsia.cpp
+++ b/compiler-rt/lib/lsan/lsan_fuchsia.cpp
@@ -76,6 +76,13 @@
       caches);
 }
 
+// On Fuchsia, leak detection is done by a special hook after atexit hooks.
+// So this doesn't install any atexit hook like on other platforms.
+void InstallAtExitCheckLeaks() {}
+
+// ASan defines this to check its `halt_on_error` flag.
+bool UseExitcodeOnLeak() { return true; }
+
 }  // namespace __lsan
 
 // These are declared (in extern "C") by <zircon/sanitizer.h>.
diff --git a/compiler-rt/lib/lsan/lsan_posix.cpp b/compiler-rt/lib/lsan/lsan_posix.cpp
--- a/compiler-rt/lib/lsan/lsan_posix.cpp
+++ b/compiler-rt/lib/lsan/lsan_posix.cpp
@@ -91,6 +91,11 @@
                      nullptr);
 }
 
+void InstallAtExitCheckLeaks() {
+  if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
+    Atexit(DoLeakCheck);
+}
+
 }  // namespace __lsan
 
 #endif  // SANITIZER_POSIX