diff --git a/clang/lib/Driver/SanitizerArgs.cpp b/clang/lib/Driver/SanitizerArgs.cpp
index e4fda752c041d..4af24662ca918 100644
--- a/clang/lib/Driver/SanitizerArgs.cpp
+++ b/clang/lib/Driver/SanitizerArgs.cpp
@@ -1088,6 +1088,22 @@ void SanitizerArgs::addArgs(const ToolChain &TC, const llvm::opt::ArgList &Args,
       Sanitizers.has(SanitizerKind::Address))
     CmdArgs.push_back("-fno-assume-sane-operator-new");
 
+  // libFuzzer wants to intercept calls to certain library functions, so the
+  // following -fno-builtin-* flags force the compiler to emit interposable
+  // libcalls to these functions. Other sanitizers effectively do the same thing
+  // by marking all library call sites with NoBuiltin attribute in their LLVM
+  // pass. (see llvm::maybeMarkSanitizerLibraryCallNoBuiltin)
+  if (Sanitizers.has(SanitizerKind::FuzzerNoLink)) {
+    CmdArgs.push_back("-fno-builtin-memcmp");
+    CmdArgs.push_back("-fno-builtin-strncmp");
+    CmdArgs.push_back("-fno-builtin-strcmp");
+    CmdArgs.push_back("-fno-builtin-strncasecmp");
+    CmdArgs.push_back("-fno-builtin-strcasecmp");
+    CmdArgs.push_back("-fno-builtin-strstr");
+    CmdArgs.push_back("-fno-builtin-strcasestr");
+    CmdArgs.push_back("-fno-builtin-memmem");
+  }
+
   // Require -fvisibility= flag on non-Windows when compiling if vptr CFI is
   // enabled.
   if (Sanitizers.hasOneOf(CFIClasses) && !TC.getTriple().isOSWindows() &&
diff --git a/compiler-rt/test/fuzzer/memcmp.test b/compiler-rt/test/fuzzer/memcmp.test
index 8859afbe8a97d..fa995a22c68a4 100644
--- a/compiler-rt/test/fuzzer/memcmp.test
+++ b/compiler-rt/test/fuzzer/memcmp.test
@@ -2,7 +2,7 @@ UNSUPPORTED: freebsd
 RUN: %cpp_compiler %S/MemcmpTest.cpp -o %t-MemcmpTest
 RUN: not %run %t-MemcmpTest               -seed=1 -runs=10000000   2>&1 | FileCheck %s
 
-RUN: %cpp_compiler -fno-sanitize=address -fno-builtin-memcmp %S/MemcmpTest.cpp -o %t-NoAsanMemcmpTest
+RUN: %cpp_compiler -fno-sanitize=address %S/MemcmpTest.cpp -o %t-NoAsanMemcmpTest
 RUN: not %run %t-MemcmpTest               -seed=1 -runs=10000000   2>&1 | FileCheck %s
 
 CHECK: BINGO
diff --git a/compiler-rt/test/fuzzer/memcmp64.test b/compiler-rt/test/fuzzer/memcmp64.test
index fc9d023243731..ca8c8fe8206f1 100644
--- a/compiler-rt/test/fuzzer/memcmp64.test
+++ b/compiler-rt/test/fuzzer/memcmp64.test
@@ -2,7 +2,7 @@ UNSUPPORTED: freebsd
 RUN: %cpp_compiler %S/Memcmp64BytesTest.cpp -o %t-Memcmp64BytesTest
 RUN: not %run %t-Memcmp64BytesTest        -seed=1 -runs=1000000   2>&1 | FileCheck %s
 
-RUN: %cpp_compiler -fno-sanitize=address -fno-builtin-memcmp %S/Memcmp64BytesTest.cpp -o %t-NoAsanMemcmp64BytesTest
+RUN: %cpp_compiler -fno-sanitize=address %S/Memcmp64BytesTest.cpp -o %t-NoAsanMemcmp64BytesTest
 RUN: not %run %t-Memcmp64BytesTest        -seed=1 -runs=1000000   2>&1 | FileCheck %s
 
 CHECK: BINGO
diff --git a/compiler-rt/test/fuzzer/strcmp.test b/compiler-rt/test/fuzzer/strcmp.test
index eebcf8ef5c708..61065de6fa94b 100644
--- a/compiler-rt/test/fuzzer/strcmp.test
+++ b/compiler-rt/test/fuzzer/strcmp.test
@@ -2,7 +2,7 @@ UNSUPPORTED: freebsd
 RUN: %cpp_compiler %S/StrcmpTest.cpp -o %t-StrcmpTest
 RUN: not %run %t-StrcmpTest               -seed=1 -runs=2000000   2>&1 | FileCheck %s
 
-RUN: %cpp_compiler -fno-sanitize=address -fno-builtin-strcmp %S/StrcmpTest.cpp -o %t-NoAsanStrcmpTest
+RUN: %cpp_compiler -fno-sanitize=address %S/StrcmpTest.cpp -o %t-NoAsanStrcmpTest
 RUN: not %run %t-StrcmpTest               -seed=1 -runs=2000000   2>&1 | FileCheck %s
 
 CHECK: BINGO
diff --git a/compiler-rt/test/fuzzer/strncmp.test b/compiler-rt/test/fuzzer/strncmp.test
index f8ff9299a1d97..102451058d440 100644
--- a/compiler-rt/test/fuzzer/strncmp.test
+++ b/compiler-rt/test/fuzzer/strncmp.test
@@ -2,7 +2,7 @@ UNSUPPORTED: freebsd
 RUN: %cpp_compiler %S/StrncmpTest.cpp -o %t-StrncmpTest
 RUN: not %run %t-StrncmpTest              -seed=2 -runs=10000000   2>&1 | FileCheck %s
 
-RUN: %cpp_compiler -fno-sanitize=address -fno-builtin-strncmp %S/StrncmpTest.cpp -o %t-NoAsanStrncmpTest
+RUN: %cpp_compiler -fno-sanitize=address %S/StrncmpTest.cpp -o %t-NoAsanStrncmpTest
 RUN: not %run %t-StrncmpTest              -seed=2 -runs=10000000   2>&1 | FileCheck %s
 
 CHECK: BINGO
diff --git a/compiler-rt/test/fuzzer/strstr.test b/compiler-rt/test/fuzzer/strstr.test
index 54a5abe8a414f..5c10805e18c65 100644
--- a/compiler-rt/test/fuzzer/strstr.test
+++ b/compiler-rt/test/fuzzer/strstr.test
@@ -2,7 +2,7 @@ UNSUPPORTED: freebsd
 RUN: %cpp_compiler %S/StrstrTest.cpp -o %t-StrstrTest
 RUN: not %run %t-StrstrTest               -seed=1 -runs=2000000   2>&1 | FileCheck %s
 
-RUN: %cpp_compiler -fno-sanitize=address -fno-builtin-strstr %S/StrstrTest.cpp -o %t-NoAsanStrstrTest
+RUN: %cpp_compiler -fno-sanitize=address %S/StrstrTest.cpp -o %t-NoAsanStrstrTest
 RUN: not %run %t-StrstrTest               -seed=1 -runs=2000000   2>&1 | FileCheck %s
 
 CHECK: BINGO