diff --git a/adb/Android.mk b/adb/Android.mk
index 8ebcbf0..cbb49f4 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -5,6 +5,35 @@
 
 LOCAL_PATH:= $(call my-dir)
 
+# libadb
+# =========================================================
+
+# Much of adb is duplicated in bootable/recovery/minadb and fastboot. Changes
+# made to adb rarely get ported to the other two, so the trees have diverged a
+# bit. We'd like to stop this because it is a maintenance nightmare, but the
+# divergence makes this difficult to do all at once. For now, we will start
+# small by moving common files into a static library. Hopefully some day we can
+# get enough of adb in here that we no longer need minadb. https://b/17626262
+LIBADB_SRC_FILES :=
+LIBADB_C_FLAGS := -Wall -Werror -D_XOPEN_SOURCE -D_GNU_SOURCE
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := libadb
+LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=0
+LOCAL_SRC_FILES := $(LIBADB_SRC_FILES) fdevent.cpp
+include $(BUILD_STATIC_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := libadb
+LOCAL_CFLAGS := $(LIBADB_CFLAGS) -DADB_HOST=1
+LOCAL_SRC_FILES := $(LIBADB_SRC_FILES)
+ifeq ($(HOST_OS),windows)
+    LOCAL_SRC_FILES += sysdeps_wind32.c
+else
+    LOCAL_SRC_FILES += fdevent.cpp
+endif
+include $(BUILD_HOST_STATIC_LIBRARY)
+
 # adb host tool
 # =========================================================
 include $(CLEAR_VARS)
@@ -37,10 +66,6 @@
   USB_SRCS := usb_windows.c
   EXTRA_SRCS := get_my_path_windows.c
   EXTRA_STATIC_LIBS := AdbWinApi
-  ifneq ($(strip $(USE_CYGWIN)),)
-    # Pure cygwin case
-    LOCAL_LDLIBS += -lpthread -lgdi32
-  endif
   ifneq ($(strip $(USE_MINGW)),)
     # MinGW under Linux case
     LOCAL_LDLIBS += -lws2_32 -lgdi32
@@ -66,8 +91,6 @@
 
 ifneq ($(USE_SYSDEPS_WIN32),)
   LOCAL_SRC_FILES += sysdeps_win32.c
-else
-  LOCAL_SRC_FILES += fdevent.c
 endif
 
 LOCAL_CFLAGS += -O2 -g -DADB_HOST=1 -Wall -Wno-unused-parameter -Werror
@@ -75,7 +98,13 @@
 LOCAL_MODULE := adb
 LOCAL_MODULE_TAGS := debug
 
-LOCAL_STATIC_LIBRARIES := libzipfile libz libcrypto_static $(EXTRA_STATIC_LIBS)
+LOCAL_STATIC_LIBRARIES := \
+    libadb \
+    libzipfile \
+    libz \
+    libcrypto_static \
+    $(EXTRA_STATIC_LIBS) \
+
 ifeq ($(USE_SYSDEPS_WIN32),)
 	LOCAL_STATIC_LIBRARIES += libcutils
 endif
@@ -99,7 +128,6 @@
 
 LOCAL_SRC_FILES := \
 	adb.c \
-	fdevent.c \
 	transport.c \
 	transport_local.c \
 	transport_usb.c \
@@ -134,15 +162,14 @@
 LOCAL_FORCE_STATIC_EXECUTABLE := true
 LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
 LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)
-LOCAL_C_INCLUDES += system/extras/ext4_utils system/core/fs_mgr/include
 
-LOCAL_STATIC_LIBRARIES := liblog \
-	libfs_mgr \
-	libcutils \
-	libc \
-	libmincrypt \
-	libselinux \
-	libext4_utils_static
+LOCAL_STATIC_LIBRARIES := \
+    libadb \
+    liblog \
+    libcutils \
+    libc \
+    libmincrypt \
+    libselinux \
 
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
@@ -168,7 +195,6 @@
 	file_sync_client.c \
 	get_my_path_linux.c \
 	usb_linux.c \
-	fdevent.c
 
 LOCAL_CFLAGS := \
 	-O2 \
@@ -181,7 +207,7 @@
 
 LOCAL_MODULE := adb
 
-LOCAL_STATIC_LIBRARIES := libzipfile libz libcutils liblog
+LOCAL_STATIC_LIBRARIES := libadb libzipfile libz libcutils liblog
 
 LOCAL_SHARED_LIBRARIES := libcrypto
 
diff --git a/adb/adb.h b/adb/adb.h
index a37fd5b..6ac4731 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -20,6 +20,7 @@
 #include <limits.h>
 
 #include "adb_trace.h"
+#include "fdevent.h"
 #include "transport.h"  /* readx(), writex() */
 
 #define MAX_PAYLOAD 4096
diff --git a/adb/fdevent.c b/adb/fdevent.cpp
similarity index 97%
rename from adb/fdevent.c
rename to adb/fdevent.cpp
index f5ecd14..bd0f3b2 100644
--- a/adb/fdevent.c
+++ b/adb/fdevent.cpp
@@ -88,6 +88,12 @@
 static fdevent list_pending = {
     .next = &list_pending,
     .prev = &list_pending,
+    .fd = -1,
+    .force_eof = 0,
+    .state = 0,
+    .events = 0,
+    .func = nullptr,
+    .arg = nullptr,
 };
 
 static fdevent **fd_table = 0;
@@ -312,7 +318,7 @@
 }
 
 #if !DEBUG
-static inline void dump_all_fds(const char *extra_msg) {}
+static inline void dump_all_fds(const char* /* extra_msg */) {}
 #else
 static void dump_all_fds(const char *extra_msg)
 {
@@ -434,7 +440,8 @@
         while(fd_table_max <= fde->fd) {
             fd_table_max *= 2;
         }
-        fd_table = realloc(fd_table, sizeof(fdevent*) * fd_table_max);
+        fd_table = reinterpret_cast<fdevent**>(
+            realloc(fd_table, sizeof(fdevent*) * fd_table_max));
         if(fd_table == 0) {
             FATAL("could not expand fd_table to %d entries\n", fd_table_max);
         }
@@ -505,7 +512,8 @@
     fde->func(fde->fd, events, fde->arg);
 }
 
-static void fdevent_subproc_event_func(int fd, unsigned ev, void *userdata)
+static void fdevent_subproc_event_func(int fd, unsigned ev,
+                                       void* /* userdata */)
 {
 
     D("subproc handling on fd=%d ev=%04x\n", fd, ev);
diff --git a/adb/fdevent.h b/adb/fdevent.h
index a0ebe2a..a8102ca 100644
--- a/adb/fdevent.h
+++ b/adb/fdevent.h
@@ -19,6 +19,10 @@
 
 #include <stdint.h>  /* for int64_t */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* events that may be observed */
 #define FDE_READ              0x0001
 #define FDE_WRITE             0x0002
@@ -64,20 +68,22 @@
 */
 void fdevent_loop();
 
-struct fdevent 
-{
+struct fdevent {
     fdevent *next;
     fdevent *prev;
 
     int fd;
     int force_eof;
 
-    unsigned short state;
-    unsigned short events;
+    uint16_t state;
+    uint16_t events;
 
     fd_func func;
     void *arg;
 };
 
+#ifdef __cplusplus
+}
+#endif
 
 #endif
diff --git a/adb/set_verity_enable_state_service.c b/adb/set_verity_enable_state_service.c
index 2660ddd..051b9a4 100644
--- a/adb/set_verity_enable_state_service.c
+++ b/adb/set_verity_enable_state_service.c
@@ -26,8 +26,6 @@
 #include <inttypes.h>
 
 #include "cutils/properties.h"
-#include "ext4_sb.h"
-#include <fs_mgr.h>
 
 #define FSTAB_PREFIX "/fstab."
 struct fstab *fstab;
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 8d63d14..304a613 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -26,16 +26,18 @@
 
 #ifdef _WIN32
 
+#include <ctype.h>
+#include <direct.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <io.h>
+#include <process.h>
+#include <sys/stat.h>
 #include <winsock2.h>
 #include <windows.h>
 #include <ws2tcpip.h>
-#include <process.h>
-#include <fcntl.h>
-#include <io.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <ctype.h>
-#include <direct.h>
+
+#include "fdevent.h"
 
 #define OS_PATH_SEPARATOR '\\'
 #define OS_PATH_SEPARATOR_STR "\\"
@@ -187,8 +189,6 @@
 #define FDE_ERROR             0x0004
 #define FDE_DONT_CLOSE        0x0080
 
-typedef struct fdevent fdevent;
-
 typedef void (*fd_func)(int fd, unsigned events, void *userdata);
 
 fdevent *fdevent_create(int fd, fd_func func, void *arg);
@@ -200,20 +200,6 @@
 void     fdevent_del(fdevent *fde, unsigned events);
 void     fdevent_loop();
 
-struct fdevent {
-    fdevent *next;
-    fdevent *prev;
-
-    int fd;
-    int force_eof;
-
-    unsigned short state;
-    unsigned short events;
-
-    fd_func func;
-    void *arg;
-};
-
 static __inline__ void  adb_sleep_ms( int  mseconds )
 {
     Sleep( mseconds );
diff --git a/adb/transport.h b/adb/transport.h
index 992e052..c1b8ff3 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -17,10 +17,19 @@
 #ifndef __TRANSPORT_H
 #define __TRANSPORT_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* convenience wrappers around read/write that will retry on
 ** EINTR and/or short read/write.  Returns 0 on success, -1
 ** on error or EOF.
 */
 int readx(int fd, void *ptr, size_t len);
 int writex(int fd, const void *ptr, size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif   /* __TRANSPORT_H */