diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 5c94227..2494016 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -5085,6 +5085,19 @@
     return;
   }
 
+  // Taking the absolute value of a pointer is very suspicious, they probably
+  // wanted to index into an array, dereference a pointer, call a function, etc.
+  if (ArgType->isPointerType() || ArgType->canDecayToPointerType()) {
+    unsigned DiagType = 0;
+    if (ArgType->isFunctionType())
+      DiagType = 1;
+    else if (ArgType->isArrayType())
+      DiagType = 2;
+
+    Diag(Call->getExprLoc(), diag::warn_pointer_abs) << DiagType << ArgType;
+    return;
+  }
+
   // std::abs has overloads which prevent most of the absolute value problems
   // from occurring.
   if (IsStdAbs)