Link libmpich 到 android GDR

Question

我已经使用 buildroot 生成了 Uclib 并用它来为 ARM 编译 mpich devices.Then 我创建了 Android 项目并复制了 libmpich.a 并且这里项目的 Include 文件夹是 Android.mk:

LOCAL_PATH := $(call my-dir)
# static library info

LOCAL_MODULE_FILENAME:= libmpich
LOCAL_MODULE := libmpich
LOCAL_SRC_FILES := ../prebuilt/libmpich.a 
LOCAL_EXPORT_C_INCLUDES := ../prebuilt/include
LOCAL_STATIC_LIBRARIES := libmpich
include $(PREBUILT_STATIC_LIBRARY)

# wrapper info
include $(CLEAR_VARS)

LOCAL_C_INCLUDES += ../prebuilt/include
LOCAL_MODULE    := ndk1
LOCAL_SRC_FILES := native.c
LOCAL_STATIC_LIBRARIES := libmpich
include $(BUILD_SHARED_LIBRARY)

在 ndk-build 之后我得到了以下错误

jni/../prebuilt/libmpich.a(initthread.o):initthread.c:function PMPI_Init_thread: error: undefined reference to 'MPL_env2bool'
jni/../prebuilt/libmpich.a(msgprint.o):msgprint.c:function MPIU_Usage_printf: error: undefined reference to 'stdout'
jni/../prebuilt/libmpich.a(msgprint.o):msgprint.c:function MPIU_Error_printf: error: undefined reference to 'stderr'
jni/../prebuilt/libmpich.a(msgprint.o):msgprint.c:function MPIU_Internal_error_printf: error: undefined reference to 'stderr'
jni/../prebuilt/libmpich.a(msgprint.o):msgprint.c:function MPIU_Internal_sys_error_printf: error: undefined reference to 'stderr'
jni/../prebuilt/libmpich.a(msgprint.o):msgprint.c:function MPIU_Msg_printf: error: undefined reference to 'stdout'
jni/../prebuilt/libmpich.a(dbg_printf.o):dbg_printf.c:function MPIU_dbg_printf: error: undefined reference to 'stdout'
jni/../prebuilt/libmpich.a(dbg_printf.o):dbg_printf.c:function MPIU_dump_dbg_memlog_to_stdout: error: undefined reference to 'stdout'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2int'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2int'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2int'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2int'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2bool'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2bool'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2bool'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2str'
jni/../prebuilt/libmpich.a(param_vals.o):param_vals.c:function MPIR_Param_init_params: error: undefined reference to 'MPL_env2str'
jni/../prebuilt/libmpich.a(mpid_abort.o):mpid_abort.c:function MPID_Abort: error: undefined reference to 'stderr'
jni/../prebuilt/libmpich.a(mpid_vc.o):mpid_vc.c:function MPIDI_Populate_vc_node_ids: error: undefined reference to '__errno_location'
jni/../prebuilt/libmpich.a(mpid_vc.o):mpid_vc.c:function MPIDI_Populate_vc_node_ids: error: undefined reference to '__ctype_b'
jni/../prebuilt/libmpich.a(init.o):init.c:function PMPI_Init: error: undefined reference to 'MPL_env2str'
jni/../prebuilt/libmpich.a(strerror.o):strerror.c:function MPIU_Strerror: error: undefined reference to '__xpg_strerror_r'
jni/../prebuilt/libmpich.a(simple_pmi.o):simple_pmi.c:function accept_one_connection: error: undefined reference to '__errno_location'
jni/../prebuilt/libmpich.a(simple_pmi.o):simple_pmi.c:function PMI_Init: error: undefined reference to '__errno_location'
jni/../prebuilt/libmpich.a(sock.o):sock.c:function MPIDU_Socki_event_enqueue.isra.1: error: undefined reference to '__errno_location'
jni/../prebuilt/libmpich.a(sock.o):sock.c:function MPIDU_Sock_listen: error: undefined reference to 'MPL_env2range'
collect2: error: ld returned 1 exit status
make: *** [obj/local/armeabi/libndk1.so] Error 1

我不明白为什么链接不正确以及缺少什么

更新：当我将 libmpl.a 添加到项目时，所有 MPL 错误都消失了

Answer 1

我认为您的问题是因为您的静态库 libmpich.a 依赖于另一个库。

你有两种不同的方法来解决这个问题：

将 libmpich.a 所需的任何库作为静态库导入 Android.mk 作为静态库。这种方法的问题是，如果你有很多依赖性，可能会非常漫长和痛苦。
将libmpich构建为一个动态库，因为动态库是和它们的依赖包在一起的。我知道你是如何构建你的 libmpich 库的，所以我不知道这是否很难实现。一旦你 libmpich.so 将它导入你的 Android.mk 作为动态库而不是静态库。

Link libmpich 到 android GDR

Link libmpich to android NDK

android

android-ndk

static-libraries

static-linking

undefined-reference