使用NDK进行交叉编译,对le32toh和be32toh的未定义引用

我试图建立一个共享库,最终交叉编译一段使用对be32toh和le32toh的引用的代码.如果我构建这段代码并从中创建可执行文件,则不会出错：

    include $(CLEAR_VARS) 
    LOCAL_SRC_FILES:= ubertooth.c ubertooth_helper.c 
    LOCAL_MODULE := ubertooth 
    LOCAL_C_INCLUDES += jni/libusb jni/libbtbb 
    LOCAL_SHARED_LIBRARIES := libc libusb libbtbb 
    LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog  
    include $(BUILD_EXECUTABLE) 

在这里,它可以成功编译：

    Compile thumb  : ubertooth <= ubertooth.c
    Compile thumb  : ubertooth <= ubertooth_helper.c
    Executable     : ubertooth
    Install        : ubertooth => libs/armeabi/ubertooth

但是,当我尝试通过仅更改Android.mk中的一行来将其构建为共享库时：

    include $(CLEAR_VARS) 
    ...
    include $(BUILD_SHARED_LIBRARY) 

我现在收到以下错误：

    Compile thumb  : ubertooth <= ubertooth.c
    Compile thumb  : ubertooth <= ubertooth_helper.c
    SharedLibrary  : libubertooth.so
    ./obj/local/armeabi/objs-debug/ubertooth/ubertooth.o: In function `stream_rx_file':
    ubertooth.c:224: undefined reference to `be32toh'
    ./obj/local/armeabi/objs-debug/ubertooth/ubertooth.o: In function `cb_lap':
    ubertooth.c:281: undefined reference to `le32toh'
    ./obj/local/armeabi/objs-debug/ubertooth/ubertooth.o: In function `cb_hop':
    ubertooth.c:417: undefined reference to `le32toh'
    ./obj/local/armeabi/objs-debug/ubertooth/ubertooth.o: In function `cb_btle':
    ubertooth.c:506: undefined reference to `le32toh'
    collect2: ld returned 1 exit status

我不明白为什么在构建共享库时会出现此链接错误,而在构建可执行文件时却不会.而且,如果我想构建共享库,如何正确链接到我所缺少的东西？

Here is ubertooth.c

解决方法:

好吧,显然这些宏在sys / endian.h中的NDK中的命名不同：

__uint64_t  htobe64(__uint64_t);
__uint32_t  htobe32(__uint32_t);
__uint16_t  htobe16(__uint16_t);
__uint64_t  betoh64(__uint64_t);
__uint32_t  betoh32(__uint32_t);
__uint16_t  betoh16(__uint16_t);

__uint64_t  htole64(__uint64_t);
__uint32_t  htole32(__uint32_t);
__uint16_t  htole16(__uint16_t);
__uint64_t  letoh64(__uint64_t);
__uint32_t  letoh32(__uint32_t);
__uint16_t  letoh16(__uint16_t);

所以,我用letoh32和betoh32

标签：android-ndk,linker,c-3,android
来源： https://codeday.me/bug/20191201/2077442.html