Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp
+++ lib/Sema/SemaExpr.cpp
@@ -5063,6 +5063,15 @@
 
   // Do special checking on direct calls to functions.
   if (FDecl) {
+    if (!getLangOpts().CPlusPlus) {
+      // C cannot handle TypoExpr nodes because it
+      // doesn't handle dependent types properly.
+      ExprResult Result = CorrectDelayedTyposInExpr(TheCall);
+      if (!Result.isUsable() || !isa<CallExpr>(Result.get()))
+        return ExprError();
+      TheCall = cast<CallExpr>(Result.get());
+    }
+
     if (CheckFunctionCall(FDecl, TheCall, Proto))
       return ExprError();
 
Index: test/Sema/typo-builtin-crash.c
===================================================================
--- test/Sema/typo-builtin-crash.c
+++ test/Sema/typo-builtin-crash.c
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+int main(void)
+{
+  fabs(a);  // expected-error {{undeclared identifier 'a'}} \
+            // expected-warning {{implicitly declaring library function 'fabs' with type 'double (double)'}} \
+            // expected-warning {{include the header <math.h> or explicitly provide a declaration for 'fabs'}}
+  return (0);
+}