linking

While trying to compile my C++ application, I get the following link error.

    /home/me/tools/crystax-ndk-10.3.2/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-g++ -Wl,--gc-sections -Wl,-z,nocopyreloc --sysroot=/home/me/tools/crystax-ndk-10.3.2/platforms/android-21/arch-arm -Wl,-rpath-link=/home/me/tools/crystax-ndk-10.3.2/platforms/android-21/arch-arm/usr/lib -Wl,-rpath-link=/home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a /home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a/objs/rn/main.o /home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a/objs/rn/init.o -lgcc /home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a/librcom.so /home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a/libgnustl_shared.so -no-canonical-prefixes -march=armv7-a -Wl,--fix-cortex-a8  -Wl,--no-undefined -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now -fPIE -pie -mthumb  -L/home/me/tools/ros-android-ndk/roscpp_android/output/roscpp_android_ndk/lib /home/me/tools/crystax-ndk-10.3.2/sources/cxx-stl/gnu-libstdc++/4.9/libs/armeabi-v7a/libsupc++.a -L/home/me/tools/crystax-ndk-10.3.2/sources/crystax/empty /home/me/tools/crystax-ndk-10.3.2/sources/crystax/libs/armeabi-v7a/thumb/libcrystax.so -lc -o /home/me/workspace/elm/elm/src/comps/van/obj/local/armeabi-v7a/rn

    jni/main.cpp:34: error: undefined reference to 'ros::init(int&, char**, std::string const&, unsigned int)'
    collect2: error: ld returned 1 exit status

Yet, the needed library (libroscpp.a) is being included and appears to have the correct symbol.

    $ nm -C ./libroscpp.a | grep "ros::init"

    00000001 T ros::init(int&, char**, std::string const&, unsigned int)

Anyone have thoughts about what might be going on?

Here's my build file (Android.mk).

    LOCAL_PATH := $(call my-dir)

    MY_ELM_HOME := /home/me/workspace/elm/elm/src
    MY_ELM_INCL := /home/me/workspace/elm/elm/src/includes
    MY_ROS_HOME := /home/me/tools/ros-android-ndk/roscpp_android/output/roscpp_android_ndk

    MY_COMMONS_INCL := $(MY_ELM_HOME)/includes/commons
    MY_COMMONS_LIBS := $(MY_ELM_HOME)/libs/commons/libs/armeabi-v7a
    MY_ROS_INCL := $(MY_ROS_HOME)/include
    MY_ROS_LIBS := $(MY_ROS_HOME)/lib

    include $(CLEAR_VARS)
    LOCAL_MODULE := settings
    LOCAL_SRC_FILES := $(MY_COMMONS_LIBS)/libelm_commons.so
    include $(PREBUILT_SHARED_LIBRARY)

    include $(CLEAR_VARS)
    LOCAL_MODULE := eam
    LOCAL_C_INCLUDES := $(MY_ELM_INCL)
    LOCAL_C_INCLUDES += $(MY_ROS_INCL)
    LOCAL_SRC_FILES := main.cpp
    LOCAL_SRC_FILES += init.cpp
    LOCAL_CPPFLAGS := -std=gnu++14
    LOCAL_CPP_FEATURES := rtti exceptions
    LOCAL_LDLIBS := -L$(MY_ROS_LIBS)
    LOCAL_SHARED_LIBRARIES := settings
    LOCAL_STATIC_LIBRARIES := libroscpp
    LOCAL_STATIC_LIBRARIES += libroscpp_serialization
    LOCAL_STATIC_LIBRARIES += librosconsole
    include $(BUILD_EXECUTABLE)

    $(call import-module,boost/1.59.0)