diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_mac.cpp
@@ -628,9 +628,15 @@
 // Offset example:
 // XNU 17 -- macOS 10.13 -- iOS 11 -- tvOS 11 -- watchOS 4
 constexpr u16 GetOSMajorKernelOffset() {
-  if (TARGET_OS_OSX) return 4;
-  if (TARGET_OS_IOS || TARGET_OS_TV) return 6;
-  if (TARGET_OS_WATCH) return 13;
+#if TARGET_OS_OSX
+  return 4;
+#endif
+#if TARGET_OS_IOS || TARGET_OS_TV
+  return 6;
+#endif
+#if TARGET_OS_WATCH
+  return 13;
+#endif
 }
 
 using VersStr = char[64];
@@ -642,13 +648,13 @@
   u16 os_major = kernel_major - offset;
 
   const char *format = "%d.0";
-  if (TARGET_OS_OSX) {
-    if (os_major >= 16) {  // macOS 11+
-      os_major -= 5;
-    } else {  // macOS 10.15 and below
-      format = "10.%d";
-    }
+#if TARGET_OS_OSX
+  if (os_major >= 16) {  // macOS 11+
+    os_major -= 5;
+  } else {  // macOS 10.15 and below
+    format = "10.%d";
   }
+#endif
   return internal_snprintf(vers, sizeof(VersStr), format, os_major);
 }
 
@@ -696,15 +702,14 @@
 // Aligned versions example:
 // macOS 10.15 -- iOS 13 -- tvOS 13 -- watchOS 6
 static void MapToMacos(u16 *major, u16 *minor) {
-  if (TARGET_OS_OSX)
-    return;
-
-  if (TARGET_OS_IOS || TARGET_OS_TV)
+#if !TARGET_OS_OSX
+#if TARGET_OS_IOS || TARGET_OS_TV
     *major += 2;
-  else if (TARGET_OS_WATCH)
+#elif TARGET_OS_WATCH
     *major += 9;
-  else
+#else
     UNREACHABLE("unsupported platform");
+#endif
 
   if (*major >= 16) {  // macOS 11+
     *major -= 5;
@@ -712,6 +717,7 @@
     *minor = *major;
     *major = 10;
   }
+#endif
 }
 
 static MacosVersion GetMacosAlignedVersionInternal() {