diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 125b469..7b533a4 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -1,3 +1,2 @@
 [Hook Scripts]
-versioner = tools/versioner/preupload.sh
 notice = tools/update_notice.sh
diff --git a/libc/Android.bp b/libc/Android.bp
index 8154470..8c6f596 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -622,6 +622,13 @@
                     "upstream-openbsd/lib/libc/string/strcat.c",
                 ],
             },
+            kryo: {
+                exclude_srcs: [
+                    "upstream-openbsd/lib/libc/string/memmove.c",
+                    "upstream-openbsd/lib/libc/string/stpcpy.c",
+                    "upstream-openbsd/lib/libc/string/strcat.c",
+                ],
+            },
         },
         arm64: {
             exclude_srcs: [
@@ -1008,7 +1015,32 @@
                     "bionic/__strcpy_chk.cpp",
                 ],
             },
+            kryo: {
+                srcs: [
+                    "arch-arm/krait/bionic/memcpy.S",
+                    "arch-arm/krait/bionic/memset.S",
+                    "arch-arm/krait/bionic/strcmp.S",
+                    "arch-arm/krait/bionic/__strcat_chk.S",
+                    "arch-arm/krait/bionic/__strcpy_chk.S",
 
+                    // Use cortex-a15 versions of strcat/strcpy/strlen.
+                    "arch-arm/cortex-a15/bionic/stpcpy.S",
+                    "arch-arm/cortex-a15/bionic/strcat.S",
+                    "arch-arm/cortex-a15/bionic/strcpy.S",
+                    "arch-arm/cortex-a15/bionic/strlen.S",
+
+                    "arch-arm/denver/bionic/memmove.S",
+                ],
+                exclude_srcs: [
+                    "arch-arm/generic/bionic/memcpy.S",
+                    "arch-arm/generic/bionic/memset.S",
+                    "arch-arm/generic/bionic/strcmp.S",
+                    "arch-arm/generic/bionic/strcpy.S",
+                    "arch-arm/generic/bionic/strlen.c",
+                    "bionic/__strcat_chk.cpp",
+                    "bionic/__strcpy_chk.cpp",
+                ],
+            },
         },
         arm64: {
             srcs: [
@@ -1862,28 +1894,10 @@
     },
 }
 
-// Android.mk:start
-// # crt obj files
-// # ========================================================
-// # crtbrand.c needs <stdint.h> and a #define for the platform SDK version.
-// libc_crt_target_cflags := \
-//    -I$(LOCAL_PATH)/include \
-//    -DPLATFORM_SDK_VERSION=$(PLATFORM_SDK_VERSION) \
-//
-// my_2nd_arch_prefix :=
-// include $(LOCAL_PATH)/arch-$(TARGET_ARCH)/$(TARGET_ARCH).mk
-// include $(LOCAL_PATH)/crt.mk
-// ifdef TARGET_2ND_ARCH
-// my_2nd_arch_prefix := $(TARGET_2ND_ARCH_VAR_PREFIX)
-// include $(LOCAL_PATH)/arch-$(TARGET_2ND_ARCH)/$(TARGET_2ND_ARCH).mk
-// include $(LOCAL_PATH)/crt.mk
-// my_2nd_arch_prefix :=
-// endif
-//
-// include $(call all-makefiles-under,$(LOCAL_PATH))
-// Android.mk:end
+// crt obj files
 cc_object {
     name: "crtbrand",
+    // crtbrand.c needs <stdint.h> and a #define for the platform SDK version.
     local_include_dirs: ["include"],
     product_variables: {
         platform_sdk_version: {
@@ -1898,7 +1912,6 @@
     ],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_so1",
     local_include_dirs: ["include"],
@@ -1910,7 +1923,6 @@
     ],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_so",
 
@@ -1924,7 +1936,6 @@
     ],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtend_so",
     local_include_dirs: ["include"],
@@ -1936,7 +1947,6 @@
     ],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_static1",
     local_include_dirs: ["include"],
@@ -1972,7 +1982,6 @@
     defaults: ["crt_defaults"],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_static",
 
@@ -1983,7 +1992,6 @@
     defaults: ["crt_defaults"],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_dynamic1",
     local_include_dirs: ["include"],
@@ -2018,7 +2026,6 @@
     defaults: ["crt_defaults"],
 }
 
-// Android.mk:ignore
 cc_object {
     name: "crtbegin_dynamic",
 
@@ -2029,7 +2036,6 @@
     defaults: ["crt_defaults"],
 }
 
-// Android.mk:ignore
 cc_object {
     // We rename crtend.o to crtend_android.o to avoid a
     // name clash between gcc and bionic.
@@ -2040,15 +2046,12 @@
     defaults: ["crt_defaults"],
 }
 
-// The following module lives in prebuilts/ndk because we need to preprocess the
-// headers to include ifdef guards for __ANDROID_API__. Update with
-// bionic/tools/update_headers.sh.
-// ndk_headers {
-//     name: "common_libc",
-//     from: "include",
-//     to: "",
-//     srcs: ["include/**/*.h"],
-// }
+preprocessed_ndk_headers {
+    name: "common_libc",
+    from: "include",
+    to: "",
+    license: "NOTICE",
+}
 
 ndk_headers {
     name: "libc_uapi",
diff --git a/libc/bionic/libc_init_common.cpp b/libc/bionic/libc_init_common.cpp
index 9094fc5..970a49c 100644
--- a/libc/bionic/libc_init_common.cpp
+++ b/libc/bionic/libc_init_common.cpp
@@ -244,6 +244,7 @@
   // of executing a setuid program or the result of an SELinux
   // security transition.
   static constexpr const char* UNSAFE_VARIABLE_NAMES[] = {
+    "ANDROID_DNS_MODE",
     "GCONV_PATH",
     "GETCONF_DIR",
     "HOSTALIASES",
diff --git a/libc/dns/resolv/res_cache.c b/libc/dns/resolv/res_cache.c
index 8b3c76b..82e0ddf 100644
--- a/libc/dns/resolv/res_cache.c
+++ b/libc/dns/resolv/res_cache.c
@@ -98,12 +98,6 @@
  *     is too short to accomodate the cached result.
  */
 
-/* the name of an environment variable that will be checked the first time
- * this code is called if its value is "0", then the resolver cache is
- * disabled.
- */
-#define  CONFIG_ENV  "BIONIC_DNSCACHE"
-
 /* default number of entries kept in the cache. This value has been
  * determined by browsing through various sites and counting the number
  * of corresponding requests. Keep in mind that our framework is currently
@@ -1812,13 +1806,6 @@
 static void
 _res_cache_init(void)
 {
-    const char*  env = getenv(CONFIG_ENV);
-
-    if (env && atoi(env) == 0) {
-        /* the cache is disabled */
-        return;
-    }
-
     memset(&_res_cache_list, 0, sizeof(_res_cache_list));
     pthread_mutex_init(&_res_cache_list_lock, NULL);
 }
diff --git a/libc/include/math.h b/libc/include/math.h
index 8bf6fb5..7dd1539 100644
--- a/libc/include/math.h
+++ b/libc/include/math.h
@@ -153,6 +153,20 @@
 long	lrint(double);
 long	lround(double);
 
+/*
+ * https://code.google.com/p/android/issues/detail?id=271629
+ * To be fully compliant with C++, we need to not define these (C doesn't
+ * specify them either). Exposing these means that isinf and isnan will have a
+ * return type of int in C++ rather than bool like they're supposed to be.
+ *
+ * GNU libstdc++ 4.9 isn't able to handle a standard compliant C library. Its
+ * <cmath> will `#undef isnan` from math.h and only adds the function overloads
+ * to the std namespace, making it impossible to use both <cmath> (which gets
+ * included by a lot of other standard headers) and ::isnan.
+ */
+int(isinf)(double) __attribute_const__ __INTRODUCED_IN(21);
+int	(isnan)(double) __attribute_const__;
+
 double nan(const char*) __attribute_const__ __INTRODUCED_IN_ARM(13) __INTRODUCED_IN_MIPS(13)
     __INTRODUCED_IN_X86(9);
 
diff --git a/libc/include/string.h b/libc/include/string.h
index 26bd93f..0cbd61c 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -358,9 +358,9 @@
 
 #if  __ANDROID_API__ >= __ANDROID_API_J_MR2__
 __BIONIC_FORTIFY_INLINE
-char* strchr(const char* const _Nonnull s __pass_object_size0, int c)
+char* strchr(const char* const _Nonnull s __pass_object_size, int c)
         __overloadable {
-    size_t bos = __bos0(s);
+    size_t bos = __bos(s);
 
     if (bos == __BIONIC_FORTIFY_UNKNOWN_SIZE) {
         return __builtin_strchr(s, c);
diff --git a/libc/private/libc_logging.h b/libc/private/libc_logging.h
index 486ace5..73bc9a5 100644
--- a/libc/private/libc_logging.h
+++ b/libc/private/libc_logging.h
@@ -71,6 +71,7 @@
 //
 // Formatting routines for the C library's internal debugging.
 // Unlike the usual alternatives, these don't allocate, and they don't drag in all of stdio.
+// These are async signal safe, so they can be called from signal handlers.
 //
 
 int __libc_format_buffer(char* _Nonnull buf, size_t size, const char* _Nonnull fmt, ...) __printflike(3, 4);
diff --git a/libc/versioner-dependencies/arm/arch-arm b/libc/versioner-dependencies/arm/arch-arm
new file mode 120000
index 0000000..cc94225
--- /dev/null
+++ b/libc/versioner-dependencies/arm/arch-arm
@@ -0,0 +1 @@
+../../arch-arm/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/arm/kernel_uapi_asm-arm b/libc/versioner-dependencies/arm/kernel_uapi_asm-arm
new file mode 120000
index 0000000..3c7584d
--- /dev/null
+++ b/libc/versioner-dependencies/arm/kernel_uapi_asm-arm
@@ -0,0 +1 @@
+../../kernel/uapi/asm-arm
\ No newline at end of file
diff --git a/libc/versioner-dependencies/arm64/arch-arm64 b/libc/versioner-dependencies/arm64/arch-arm64
new file mode 120000
index 0000000..2d9128a
--- /dev/null
+++ b/libc/versioner-dependencies/arm64/arch-arm64
@@ -0,0 +1 @@
+../../arch-arm64/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/arm64/kernel_uapi_asm-arm64 b/libc/versioner-dependencies/arm64/kernel_uapi_asm-arm64
new file mode 120000
index 0000000..7ee6fd2
--- /dev/null
+++ b/libc/versioner-dependencies/arm64/kernel_uapi_asm-arm64
@@ -0,0 +1 @@
+../../kernel/uapi/asm-arm64
\ No newline at end of file
diff --git a/libc/versioner-dependencies/common/clang-builtins b/libc/versioner-dependencies/common/clang-builtins
new file mode 120000
index 0000000..7bd481c
--- /dev/null
+++ b/libc/versioner-dependencies/common/clang-builtins
@@ -0,0 +1 @@
+../../../../external/clang/lib/Headers/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/common/kernel_android_uapi b/libc/versioner-dependencies/common/kernel_android_uapi
new file mode 120000
index 0000000..fd78315
--- /dev/null
+++ b/libc/versioner-dependencies/common/kernel_android_uapi
@@ -0,0 +1 @@
+../../kernel/android/uapi/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/common/kernel_uapi b/libc/versioner-dependencies/common/kernel_uapi
new file mode 120000
index 0000000..d5cb8ee
--- /dev/null
+++ b/libc/versioner-dependencies/common/kernel_uapi
@@ -0,0 +1 @@
+../../kernel/uapi/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/mips/arch-mips b/libc/versioner-dependencies/mips/arch-mips
new file mode 120000
index 0000000..56ed021
--- /dev/null
+++ b/libc/versioner-dependencies/mips/arch-mips
@@ -0,0 +1 @@
+../../arch-mips/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/mips/kernel_uapi_asm-mips b/libc/versioner-dependencies/mips/kernel_uapi_asm-mips
new file mode 120000
index 0000000..94bb3db
--- /dev/null
+++ b/libc/versioner-dependencies/mips/kernel_uapi_asm-mips
@@ -0,0 +1 @@
+../../kernel/uapi/asm-mips
\ No newline at end of file
diff --git a/libc/versioner-dependencies/mips64/arch-mips64 b/libc/versioner-dependencies/mips64/arch-mips64
new file mode 120000
index 0000000..4893b57
--- /dev/null
+++ b/libc/versioner-dependencies/mips64/arch-mips64
@@ -0,0 +1 @@
+../../arch-mips64/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/mips64/kernel_uapi_asm-mips b/libc/versioner-dependencies/mips64/kernel_uapi_asm-mips
new file mode 120000
index 0000000..94bb3db
--- /dev/null
+++ b/libc/versioner-dependencies/mips64/kernel_uapi_asm-mips
@@ -0,0 +1 @@
+../../kernel/uapi/asm-mips
\ No newline at end of file
diff --git a/libc/versioner-dependencies/x86/arch-x86 b/libc/versioner-dependencies/x86/arch-x86
new file mode 120000
index 0000000..6426384
--- /dev/null
+++ b/libc/versioner-dependencies/x86/arch-x86
@@ -0,0 +1 @@
+../../arch-x86/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/x86/kernel_uapi_asm-x86 b/libc/versioner-dependencies/x86/kernel_uapi_asm-x86
new file mode 120000
index 0000000..1b7a73d
--- /dev/null
+++ b/libc/versioner-dependencies/x86/kernel_uapi_asm-x86
@@ -0,0 +1 @@
+../../kernel/uapi/asm-x86/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/x86_64/arch-x86_64 b/libc/versioner-dependencies/x86_64/arch-x86_64
new file mode 120000
index 0000000..684d74e
--- /dev/null
+++ b/libc/versioner-dependencies/x86_64/arch-x86_64
@@ -0,0 +1 @@
+../../arch-x86_64/include/
\ No newline at end of file
diff --git a/libc/versioner-dependencies/x86_64/kernel_uapi_asm-x86 b/libc/versioner-dependencies/x86_64/kernel_uapi_asm-x86
new file mode 120000
index 0000000..1b7a73d
--- /dev/null
+++ b/libc/versioner-dependencies/x86_64/kernel_uapi_asm-x86
@@ -0,0 +1 @@
+../../kernel/uapi/asm-x86/
\ No newline at end of file
diff --git a/linker/Android.bp b/linker/Android.bp
index 23138cf..d617189 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -119,13 +119,7 @@
         "libbase",
         "libz",
 
-        "libdebuggerd_handler_core",
         "libdebuggerd_handler_fallback",
-        "libdebuggerd",
-        "libbacktrace",
-        "libunwind",
-        "liblzma",
-        "libcutils",
 
         "liblog",
         "libc++_static",
diff --git a/tests/sys_ptrace_test.cpp b/tests/sys_ptrace_test.cpp
index bce5898..69638be 100644
--- a/tests/sys_ptrace_test.cpp
+++ b/tests/sys_ptrace_test.cpp
@@ -17,6 +17,7 @@
 #include <sys/ptrace.h>
 
 #include <elf.h>
+#include <err.h>
 #include <fcntl.h>
 #include <sched.h>
 #include <sys/prctl.h>
@@ -26,11 +27,16 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
+#include <chrono>
+#include <thread>
+
 #include <gtest/gtest.h>
 
 #include <android-base/macros.h>
 #include <android-base/unique_fd.h>
 
+using namespace std::chrono_literals;
+
 using android::base::unique_fd;
 
 // Host libc does not define this.
@@ -367,31 +373,39 @@
 
 class PtraceResumptionTest : public ::testing::Test {
  public:
+  unique_fd worker_pipe_write;
+
   pid_t worker = -1;
+  pid_t tracer = -1;
+
   PtraceResumptionTest() {
+    unique_fd worker_pipe_read;
+    int pipefd[2];
+    if (pipe2(pipefd, O_CLOEXEC) != 0) {
+      err(1, "failed to create pipe");
+    }
+
+    worker_pipe_read.reset(pipefd[0]);
+    worker_pipe_write.reset(pipefd[1]);
+
+    worker = fork();
+    if (worker == -1) {
+      err(1, "failed to fork worker");
+    } else if (worker == 0) {
+      char buf;
+      worker_pipe_write.reset();
+      TEMP_FAILURE_RETRY(read(worker_pipe_read.get(), &buf, sizeof(buf)));
+      exit(0);
+    }
   }
 
   ~PtraceResumptionTest() {
   }
 
   void AssertDeath(int signo);
-  void Start(std::function<void()> f) {
-    unique_fd worker_pipe_read, worker_pipe_write;
-    int pipefd[2];
-    ASSERT_EQ(0, pipe2(pipefd, O_CLOEXEC));
-    worker_pipe_read.reset(pipefd[0]);
-    worker_pipe_write.reset(pipefd[1]);
 
-    worker = fork();
-    ASSERT_NE(-1, worker);
-    if (worker == 0) {
-      char buf;
-      worker_pipe_write.reset();
-      TEMP_FAILURE_RETRY(read(worker_pipe_read.get(), &buf, sizeof(buf)));
-      exit(0);
-    }
-
-    pid_t tracer = fork();
+  void StartTracer(std::function<void()> f) {
+    tracer = fork();
     ASSERT_NE(-1, tracer);
     if (tracer == 0) {
       f();
@@ -400,26 +414,66 @@
       }
       exit(0);
     }
+  }
+
+  bool WaitForTracer() {
+    if (tracer == -1) {
+      errx(1, "tracer not started");
+    }
 
     int result;
     pid_t rc = waitpid(tracer, &result, 0);
-    ASSERT_EQ(tracer, rc);
-    EXPECT_TRUE(WIFEXITED(result) || WIFSIGNALED(result));
+    if (rc != tracer) {
+      printf("waitpid returned %d (%s)\n", rc, strerror(errno));
+      return false;
+    }
+
+    if (!WIFEXITED(result) && !WIFSIGNALED(result)) {
+      printf("!WIFEXITED && !WIFSIGNALED\n");
+      return false;
+    }
+
     if (WIFEXITED(result)) {
       if (WEXITSTATUS(result) != 0) {
-        FAIL() << "tracer failed";
+        printf("tracer failed\n");
+        return false;
       }
     }
 
-    rc = waitpid(worker, &result, WNOHANG);
-    ASSERT_EQ(0, rc);
+    return true;
+  }
+
+  bool WaitForWorker() {
+    if (worker == -1) {
+      errx(1, "worker not started");
+    }
+
+    int result;
+    pid_t rc = waitpid(worker, &result, WNOHANG);
+    if (rc != 0) {
+      printf("worker exited prematurely\n");
+      return false;
+    }
 
     worker_pipe_write.reset();
 
     rc = waitpid(worker, &result, 0);
-    ASSERT_EQ(worker, rc);
-    EXPECT_TRUE(WIFEXITED(result));
-    EXPECT_EQ(WEXITSTATUS(result), 0);
+    if (rc != worker) {
+      printf("waitpid for worker returned %d (%s)\n", rc, strerror(errno));
+      return false;
+    }
+
+    if (!WIFEXITED(result)) {
+      printf("worker didn't exit\n");
+      return false;
+    }
+
+    if (WEXITSTATUS(result) != 0) {
+      printf("worker exited with status %d\n", WEXITSTATUS(result));
+      return false;
+    }
+
+    return true;
   }
 };
 
@@ -436,22 +490,74 @@
   }
 }
 
+TEST_F(PtraceResumptionTest, smoke) {
+  // Make sure that the worker doesn't exit before the tracer stops tracing.
+  StartTracer([this]() {
+    ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno);
+    ASSERT_EQ(0, ptrace(PTRACE_INTERRUPT, worker, 0, 0)) << strerror(errno);
+    wait_for_ptrace_stop(worker);
+    std::this_thread::sleep_for(500ms);
+  });
+
+  worker_pipe_write.reset();
+  std::this_thread::sleep_for(250ms);
+
+  int result;
+  ASSERT_EQ(0, waitpid(worker, &result, WNOHANG));
+  ASSERT_TRUE(WaitForTracer());
+  ASSERT_EQ(worker, waitpid(worker, &result, 0));
+}
+
 TEST_F(PtraceResumptionTest, seize) {
-  Start([this]() { ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno); });
+  StartTracer([this]() { ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno); });
+  ASSERT_TRUE(WaitForTracer());
+  ASSERT_TRUE(WaitForWorker());
 }
 
 TEST_F(PtraceResumptionTest, seize_interrupt) {
-  Start([this]() {
+  StartTracer([this]() {
     ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno);
     ASSERT_EQ(0, ptrace(PTRACE_INTERRUPT, worker, 0, 0)) << strerror(errno);
+    wait_for_ptrace_stop(worker);
   });
+  ASSERT_TRUE(WaitForTracer());
+  ASSERT_TRUE(WaitForWorker());
 }
 
 TEST_F(PtraceResumptionTest, seize_interrupt_cont) {
-  Start([this]() {
+  StartTracer([this]() {
     ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno);
     ASSERT_EQ(0, ptrace(PTRACE_INTERRUPT, worker, 0, 0)) << strerror(errno);
     wait_for_ptrace_stop(worker);
     ASSERT_EQ(0, ptrace(PTRACE_CONT, worker, 0, 0)) << strerror(errno);
   });
+  ASSERT_TRUE(WaitForTracer());
+  ASSERT_TRUE(WaitForWorker());
+}
+
+TEST_F(PtraceResumptionTest, zombie_seize) {
+  StartTracer([this]() { ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno); });
+  ASSERT_TRUE(WaitForWorker());
+  ASSERT_TRUE(WaitForTracer());
+}
+
+TEST_F(PtraceResumptionTest, zombie_seize_interrupt) {
+  StartTracer([this]() {
+    ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno);
+    ASSERT_EQ(0, ptrace(PTRACE_INTERRUPT, worker, 0, 0)) << strerror(errno);
+    wait_for_ptrace_stop(worker);
+  });
+  ASSERT_TRUE(WaitForWorker());
+  ASSERT_TRUE(WaitForTracer());
+}
+
+TEST_F(PtraceResumptionTest, zombie_seize_interrupt_cont) {
+  StartTracer([this]() {
+    ASSERT_EQ(0, ptrace(PTRACE_SEIZE, worker, 0, 0)) << strerror(errno);
+    ASSERT_EQ(0, ptrace(PTRACE_INTERRUPT, worker, 0, 0)) << strerror(errno);
+    wait_for_ptrace_stop(worker);
+    ASSERT_EQ(0, ptrace(PTRACE_CONT, worker, 0, 0)) << strerror(errno);
+  });
+  ASSERT_TRUE(WaitForWorker());
+  ASSERT_TRUE(WaitForTracer());
 }
diff --git a/tools/update_headers.sh b/tools/update_headers.sh
deleted file mode 100755
index 0095d50..0000000
--- a/tools/update_headers.sh
+++ /dev/null
@@ -1,53 +0,0 @@
-#!/bin/bash
-DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
-cd $DIR
-
-which versioner >/dev/null 2>&1
-if [ $? -ne 0 ]; then
-  >&2 echo "versioner not in path; run mma in $DIR/versioner"
-  exit 1
-fi
-
-VERSION=$(git rev-parse --short HEAD)
-git diff-index --quiet HEAD
-DIRTY=$?
-git branch -r --contains HEAD | grep -q aosp/master
-SUBMITTED=$?
-
-if [ $DIRTY -ne 0 ]; then
-  >&2 echo "Warning: bionic has uncommitted changes"
-  VERSION="${VERSION}-dirty"
-elif [ $SUBMITTED -ne 0 ]; then
-  >&2 echo "Warning: current HEAD does not exist in aosp/master"
-  VERSION="${VERSION}-unsubmitted"
-fi
-
-PREBUILTS_DIR=$ANDROID_BUILD_TOP/prebuilts/ndk
-BRANCH_NAME=$(git -C $PREBUILTS_DIR symbolic-ref --short -q HEAD)
-if [ $? -ne 0 ]; then
-  BRANCH_NAME=update-bionic-headers-$VERSION
-  echo "prebuilts/ndk has detached head; creating branch $BRANCH_NAME"
-  repo start $BRANCH_NAME $PREBUILTS_DIR
-else
-  echo "prebuilts/ndk already on branch $BRANCH_NAME"
-fi
-
-HEADERS_INSTALL=$PREBUILTS_DIR/headers
-if [ -d "$HEADERS_INSTALL" ]; then
-  git -C $PREBUILTS_DIR rm -r --ignore-unmatch $HEADERS_INSTALL
-  if [ -d $HEADERS_INSTALL ]; then
-    rm -r $HEADERS_INSTALL
-  fi
-fi
-
-versioner -p versioner/platforms versioner/current versioner/dependencies \
-  -o $HEADERS_INSTALL
-if [ $? -ne 0 ]; then
-  >&2 echo "Header preprocessing failed"
-  exit 1
-fi
-
-cp ../libc/NOTICE $PREBUILTS_DIR
-
-git -C $PREBUILTS_DIR add $HEADERS_INSTALL $PREBUILTS_DIR/NOTICE
-git -C $PREBUILTS_DIR commit -m "Update bionic headers to $VERSION."
diff --git a/tools/versioner/dependencies/arm/arch-arm b/tools/versioner/dependencies/arm/arch-arm
deleted file mode 120000
index ed69f41..0000000
--- a/tools/versioner/dependencies/arm/arch-arm
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-arm/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/arm/kernel_uapi_asm-arm b/tools/versioner/dependencies/arm/kernel_uapi_asm-arm
deleted file mode 120000
index fabed85..0000000
--- a/tools/versioner/dependencies/arm/kernel_uapi_asm-arm
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-arm
\ No newline at end of file
diff --git a/tools/versioner/dependencies/arm64/arch-arm64 b/tools/versioner/dependencies/arm64/arch-arm64
deleted file mode 120000
index 21a21d4..0000000
--- a/tools/versioner/dependencies/arm64/arch-arm64
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-arm64/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/arm64/kernel_uapi_asm-arm64 b/tools/versioner/dependencies/arm64/kernel_uapi_asm-arm64
deleted file mode 120000
index 16e74a3..0000000
--- a/tools/versioner/dependencies/arm64/kernel_uapi_asm-arm64
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-arm64
\ No newline at end of file
diff --git a/tools/versioner/dependencies/common/clang-builtins b/tools/versioner/dependencies/common/clang-builtins
deleted file mode 120000
index fc27e65..0000000
--- a/tools/versioner/dependencies/common/clang-builtins
+++ /dev/null
@@ -1 +0,0 @@
-../../../../../external/clang/lib/Headers
\ No newline at end of file
diff --git a/tools/versioner/dependencies/common/kernel_android_uapi b/tools/versioner/dependencies/common/kernel_android_uapi
deleted file mode 120000
index bcf6daa..0000000
--- a/tools/versioner/dependencies/common/kernel_android_uapi
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/android/uapi
\ No newline at end of file
diff --git a/tools/versioner/dependencies/common/kernel_uapi b/tools/versioner/dependencies/common/kernel_uapi
deleted file mode 120000
index 2a915ef..0000000
--- a/tools/versioner/dependencies/common/kernel_uapi
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi
\ No newline at end of file
diff --git a/tools/versioner/dependencies/mips/arch-mips b/tools/versioner/dependencies/mips/arch-mips
deleted file mode 120000
index 7f2f104..0000000
--- a/tools/versioner/dependencies/mips/arch-mips
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-mips/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/mips/kernel_uapi_asm-mips b/tools/versioner/dependencies/mips/kernel_uapi_asm-mips
deleted file mode 120000
index dcd1955..0000000
--- a/tools/versioner/dependencies/mips/kernel_uapi_asm-mips
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-mips
\ No newline at end of file
diff --git a/tools/versioner/dependencies/mips64/arch-mips64 b/tools/versioner/dependencies/mips64/arch-mips64
deleted file mode 120000
index 48cea72..0000000
--- a/tools/versioner/dependencies/mips64/arch-mips64
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-mips64/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/mips64/kernel_uapi_asm-mips b/tools/versioner/dependencies/mips64/kernel_uapi_asm-mips
deleted file mode 120000
index dcd1955..0000000
--- a/tools/versioner/dependencies/mips64/kernel_uapi_asm-mips
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-mips
\ No newline at end of file
diff --git a/tools/versioner/dependencies/x86/arch-x86 b/tools/versioner/dependencies/x86/arch-x86
deleted file mode 120000
index d0f016a..0000000
--- a/tools/versioner/dependencies/x86/arch-x86
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-x86/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/x86/kernel_uapi_asm-x86 b/tools/versioner/dependencies/x86/kernel_uapi_asm-x86
deleted file mode 120000
index 0efae62..0000000
--- a/tools/versioner/dependencies/x86/kernel_uapi_asm-x86
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-x86
\ No newline at end of file
diff --git a/tools/versioner/dependencies/x86_64/arch-x86_64 b/tools/versioner/dependencies/x86_64/arch-x86_64
deleted file mode 120000
index deb647d..0000000
--- a/tools/versioner/dependencies/x86_64/arch-x86_64
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/arch-x86_64/include
\ No newline at end of file
diff --git a/tools/versioner/dependencies/x86_64/kernel_uapi_asm-x86 b/tools/versioner/dependencies/x86_64/kernel_uapi_asm-x86
deleted file mode 120000
index 0efae62..0000000
--- a/tools/versioner/dependencies/x86_64/kernel_uapi_asm-x86
+++ /dev/null
@@ -1 +0,0 @@
-../../../../libc/kernel/uapi/asm-x86
\ No newline at end of file
diff --git a/tools/versioner/preupload.sh b/tools/versioner/preupload.sh
deleted file mode 100755
index 45d6cca..0000000
--- a/tools/versioner/preupload.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/bash
-
-if ! which versioner > /dev/null; then
-  echo "versioner not found (lunch and mma in bionic)"
-  exit 1
-fi
-
-versioner -r arm -r arm64
-exit $?
diff --git a/tools/versioner/src/Android.bp b/tools/versioner/src/Android.bp
index d1362d0..c5afa56 100644
--- a/tools/versioner/src/Android.bp
+++ b/tools/versioner/src/Android.bp
@@ -41,18 +41,8 @@
                 "-fno-rtti",
             ],
         },
-        darwin: {
-            enabled: false,
-        },
         windows: {
             enabled: false,
         },
     },
-
-    product_variables: {
-        unbundled_build: {
-            // Only do this when Clang is available.
-            enabled: false,
-        },
-    },
 }
diff --git a/tools/versioner/src/Preprocessor.cpp b/tools/versioner/src/Preprocessor.cpp
index 86bb225..757a392 100644
--- a/tools/versioner/src/Preprocessor.cpp
+++ b/tools/versioner/src/Preprocessor.cpp
@@ -336,7 +336,6 @@
 
         current_location.column = pos + 1;
         if (line[pos] != '/') {
-          D("Trailing character '%c' is not a slash: %s\n", line[pos], line.substr(pos).c_str());
           valid = false;
           break;
         }
@@ -409,7 +408,9 @@
     file_lines[loc.start.line - 1].insert(loc.start.column - 1, prologue);
   }
 
-  printf("Preprocessing %s...\n", output_path.c_str());
+  if (verbose) {
+    printf("Preprocessing %s...\n", output_path.c_str());
+  }
   writeFileLines(output_path, file_lines);
 }
 
diff --git a/tools/versioner/src/versioner.cpp b/tools/versioner/src/versioner.cpp
index e39bec0..194f276 100644
--- a/tools/versioner/src/versioner.cpp
+++ b/tools/versioner/src/versioner.cpp
@@ -435,7 +435,7 @@
     fprintf(stderr, "\n");
     fprintf(stderr, "Preprocessing:\n");
     fprintf(stderr, "  -o PATH\tpreprocess header files and emit them at PATH\n");
-    fprintf(stderr, "  -f\tpreprocess header files even if validation fails\n");
+    fprintf(stderr, "  -f\t\tpreprocess header files even if validation fails\n");
     fprintf(stderr, "\n");
     fprintf(stderr, "Miscellaneous:\n");
     fprintf(stderr, "  -d\t\tdump function availability\n");