ld：找不到架构x86_64（libusb）的符号

Question

我正在尝试在Mac上编译以下libusb代码段：

#include <stdio.h>
#include <stdlib.h>
#include <libusb.h>

int main(void) {
    libusb_device **devices;
    ssize_t device_count = 0;

    device_count = libusb_get_device_list(NULL, &devices);

    printf("%d devices found\n", (int)device_count);

    return EXIT_SUCCESS;
}

我通过Homebrew安装了libusb。

我在编译期间遇到以下错误：

  

ld：找不到架构x86_64的符号

完整的编译器输出如下：

22:28:24 **** Incremental Build of configuration Debug for project libusb ****
make all 
Building file: ../src/libusb.c
Invoking: Cross GCC Compiler
gcc -I/usr/local/Cellar/libusb/1.0.9/include/libusb-1.0/ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/libusb.d" -MT"src/libusb.d" -o "src/libusb.o" "../src/libusb.c"
Finished building: ../src/libusb.c

Building target: libusb
Invoking: Cross GCC Linker
gcc  -o "libusb"  ./src/libusb.o   
Undefined symbols for architecture x86_64:
  "_libusb_get_device_list", referenced from:
      _main in libusb.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libusb] Error 1

22:28:24 Build Finished (took 119ms)

我理解问题是链接器没有找到libusb库，对吧？如何告诉编译器Eclipse CDT中的位置？

Answer 1

正如我们在所有评论中所做的那样，有效的链接命令是

gcc -L/usr/local/Cellar/libusb/1.0.9/lib -o "libusb_example" ./src/libusb_example.o -lusb1.0