diff --git a/libc/Android.bp b/libc/Android.bp
index fa1eab6..5554f28 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -76,6 +76,7 @@
     },
     native_coverage: false,
     recovery_available: true,
+    native_bridge_supported: true,
 
     // lld complains about duplicate symbols in libcrt and libgcc. Suppress the
     // warning since this is intended right now.
@@ -1692,6 +1693,7 @@
     host_supported: true,
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
 
     no_libcrt: true,
     no_libgcc: true,
@@ -1824,6 +1826,7 @@
     defaults: ["linux_bionic_supported"],
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
 
     cflags: [
         "-Wno-gcc-compat",
@@ -2082,6 +2085,7 @@
 
 ndk_library {
     name: "libc",
+    native_bridge_supported: true,
     symbol_file: "libc.map.txt",
     first_version: "9",
 }
@@ -2091,6 +2095,7 @@
     symbol_file: "libc.map.txt",
     export_headers_as_system: true,
     export_preprocessed_headers: ["include"],
+    native_bridge_supported: true,
     export_include_dirs: [
         "kernel/android/uapi",
         "kernel/uapi",
diff --git a/libc/async_safe/Android.bp b/libc/async_safe/Android.bp
index fbaaad1..c28d53a 100644
--- a/libc/async_safe/Android.bp
+++ b/libc/async_safe/Android.bp
@@ -10,6 +10,7 @@
     name: "libasync_safe",
     vendor_available: true,
     recovery_available: true,
+    native_bridge_supported: true,
 
     include_dirs: ["bionic/libc"],
     header_libs: ["libc_headers", "liblog_headers"],
@@ -22,6 +23,7 @@
 cc_library_headers {
     name: "libasync_safe_headers",
     recovery_available: true,
+    native_bridge_supported: true,
     defaults: ["linux_bionic_supported"],
 
     export_include_dirs: ["include"],
diff --git a/libc/bionic/malloc_heapprofd.cpp b/libc/bionic/malloc_heapprofd.cpp
index 2aeb9bf..5d3735d 100644
--- a/libc/bionic/malloc_heapprofd.cpp
+++ b/libc/bionic/malloc_heapprofd.cpp
@@ -143,22 +143,23 @@
   }
 }
 
+constexpr char kHeapprofdProgramPropertyPrefix[] = "heapprofd.enable.";
+constexpr size_t kHeapprofdProgramPropertyPrefixSize = sizeof(kHeapprofdProgramPropertyPrefix) - 1;
+constexpr size_t kMaxCmdlineSize = 512;
+
 static bool GetHeapprofdProgramProperty(char* data, size_t size) {
-  constexpr char prefix[] = "heapprofd.enable.";
-  // - 1 to skip nullbyte, which we will write later.
-  constexpr size_t prefix_size = sizeof(prefix) - 1;
-  if (size < prefix_size) {
+  if (size < kHeapprofdProgramPropertyPrefixSize) {
     error_log("%s: Overflow constructing heapprofd property", getprogname());
     return false;
   }
-  memcpy(data, prefix, prefix_size);
+  memcpy(data, kHeapprofdProgramPropertyPrefix, kHeapprofdProgramPropertyPrefixSize);
 
   int fd = open("/proc/self/cmdline", O_RDONLY | O_CLOEXEC);
   if (fd == -1) {
     error_log("%s: Failed to open /proc/self/cmdline", getprogname());
     return false;
   }
-  char cmdline[128];
+  char cmdline[kMaxCmdlineSize];
   ssize_t rd = read(fd, cmdline, sizeof(cmdline) - 1);
   close(fd);
   if (rd == -1) {
@@ -167,7 +168,7 @@
   }
   cmdline[rd] = '\0';
   char* first_arg = static_cast<char*>(memchr(cmdline, '\0', rd));
-  if (first_arg == nullptr || first_arg == cmdline + size - 1) {
+  if (first_arg == nullptr) {
     error_log("%s: Overflow reading cmdline", getprogname());
     return false;
   }
@@ -192,12 +193,12 @@
   }
 
   size_t name_size = static_cast<size_t>(first_arg - start);
-  if (name_size >= size - prefix_size) {
+  if (name_size >= size - kHeapprofdProgramPropertyPrefixSize) {
     error_log("%s: overflow constructing heapprofd property.", getprogname());
     return false;
   }
   // + 1 to also copy the trailing null byte.
-  memcpy(data + prefix_size, start, name_size + 1);
+  memcpy(data + kHeapprofdProgramPropertyPrefixSize, start, name_size + 1);
   return true;
 }
 
@@ -213,7 +214,7 @@
     return true;
   }
 
-  char program_property[128];
+  char program_property[kHeapprofdProgramPropertyPrefixSize + kMaxCmdlineSize];
   if (!GetHeapprofdProgramProperty(program_property,
                                    sizeof(program_property))) {
     return false;
diff --git a/libc/include/bits/seek_constants.h b/libc/include/bits/seek_constants.h
index 6b88606..6f3f22d 100644
--- a/libc/include/bits/seek_constants.h
+++ b/libc/include/bits/seek_constants.h
@@ -39,3 +39,23 @@
 #define SEEK_CUR 1
 /** Seek relative to the end of the file. */
 #define SEEK_END 2
+
+#if defined(__USE_GNU)
+
+/**
+ * Seek to the first data (non-hole) location in the file
+ * greater than or equal to the given offset.
+ *
+ * See [lseek(2)](http://man7.org/linux/man-pages/man2/lseek.2.html).
+ */
+#define SEEK_DATA 3
+
+/**
+ * Seek to the first hole (non-data) location in the file
+ * greater than or equal to the given offset.
+ *
+ * See [lseek(2)](http://man7.org/linux/man-pages/man2/lseek.2.html).
+ */
+#define SEEK_HOLE 4
+
+#endif
diff --git a/libc/system_properties/Android.bp b/libc/system_properties/Android.bp
index 911afb1..8780dda 100644
--- a/libc/system_properties/Android.bp
+++ b/libc/system_properties/Android.bp
@@ -1,6 +1,7 @@
 cc_library_static {
     name: "libsystemproperties",
     defaults: ["libc_defaults"],
+    native_bridge_supported: true,
     srcs: [
         "context_node.cpp",
         "contexts_split.cpp",
diff --git a/libdl/Android.bp b/libdl/Android.bp
index b1ee5ab..e36ddc5 100644
--- a/libdl/Android.bp
+++ b/libdl/Android.bp
@@ -5,6 +5,7 @@
     name: "libdl_static",
     defaults: ["linux_bionic_supported"],
     recovery_available: true,
+    native_bridge_supported: true,
 
     srcs: [
         "libdl.cpp",
@@ -32,6 +33,7 @@
 cc_library {
     name: "libdl",
     recovery_available: true,
+    native_bridge_supported: true,
     static_ndk_lib: true,
 
     defaults: ["linux_bionic_supported"],
@@ -47,6 +49,7 @@
 
     ldflags: [
         "-Wl,--exclude-libs=libgcc.a",
+        "-Wl,--exclude-libs=libgcc_stripped.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-arm-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-aarch64-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-x86-android.a",
@@ -115,6 +118,7 @@
 
     defaults: ["linux_bionic_supported"],
     recovery_available: true,
+    native_bridge_supported: true,
 
     // NOTE: --exclude-libs=libgcc.a makes sure that any symbols libdl.so pulls from
     // libgcc.a are made static to libdl.so.  This in turn ensures that libraries that
@@ -127,6 +131,7 @@
 
     ldflags: [
         "-Wl,--exclude-libs=libgcc.a",
+        "-Wl,--exclude-libs=libgcc_stripped.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-arm-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-aarch64-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-x86-android.a",
@@ -179,12 +184,14 @@
 
 ndk_library {
     name: "libdl",
+    native_bridge_supported: true,
     symbol_file: "libdl.map.txt",
     first_version: "9",
 }
 
 llndk_library {
     name: "libdl",
+    native_bridge_supported: true,
     symbol_file: "libdl.map.txt",
 }
 
diff --git a/libm/Android.bp b/libm/Android.bp
index 8c32810..48b9a5f 100644
--- a/libm/Android.bp
+++ b/libm/Android.bp
@@ -507,6 +507,7 @@
         integer_overflow: false,
     },
     stl: "none",
+    native_bridge_supported: true,
 
     stubs: {
         symbol_file: "libm.map.txt",
@@ -516,12 +517,14 @@
 
 ndk_library {
     name: "libm",
+    native_bridge_supported: true,
     symbol_file: "libm.map.txt",
     first_version: "9",
 }
 
 llndk_library {
     name: "libm",
+    native_bridge_supported: true,
     symbol_file: "libm.map.txt",
 }
 
diff --git a/linker/Android.bp b/linker/Android.bp
index 95fd4f7..23ef5ac 100644
--- a/linker/Android.bp
+++ b/linker/Android.bp
@@ -2,6 +2,7 @@
     name: "liblinker_malloc",
     defaults: ["linux_bionic_supported"],
     recovery_available: true,
+    native_bridge_supported: true,
 
     srcs: [
         "linker_memory.cpp",
@@ -318,6 +319,7 @@
 
     ldflags: [
         "-Wl,--exclude-libs=libgcc.a",
+        "-Wl,--exclude-libs=libgcc_stripped.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-arm-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-aarch64-android.a",
         "-Wl,--exclude-libs=libclang_rt.builtins-x86-android.a",
@@ -360,6 +362,7 @@
     name: "ld-android",
     defaults: ["linux_bionic_supported"],
     recovery_available: true,
+    native_bridge_supported: true,
 
     nocrt: true,
     system_shared_libs: [],
diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index c237d6d..01b4dba 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
+#include <linux/fs.h>
 #include <math.h>
 #include <stdio.h>
 #include <sys/types.h>
@@ -2599,3 +2600,13 @@
   funlockfile(fp1);
   fclose(fp1);
 }
+
+TEST(STDIO_TEST, SEEK_macros) {
+  ASSERT_EQ(0, SEEK_SET);
+  ASSERT_EQ(1, SEEK_CUR);
+  ASSERT_EQ(2, SEEK_END);
+  ASSERT_EQ(3, SEEK_DATA);
+  ASSERT_EQ(4, SEEK_HOLE);
+  // So we'll notice if Linux grows another constant in <linux/fs.h>...
+  ASSERT_EQ(SEEK_MAX, SEEK_HOLE);
+}