我有这个非常简单的代码，我试图编译。我对命令行 GCC 相当陌生，所以请原谅我。我已经用GCC尝试了很多不同的东西，但我仍然无法编译它。我确实安装了 libusb 。如何获得这段代码进行编译？
Libusb：
anything：usb mymac $ brew list libusb /usr/local/Cellar/libusb/1.0.9/include/libusb-1.0/libusb.h /usr/local/Cellar/libusb/1.0 .9 / lib / libusb-1.0.0.dylib /usr/local/Cellar/libusb/1.0.9/lib/pkgconfig/libusb-1.0.pc / usr / local / Cellar / libusb /1.0.9/lib/（2个其他文件）任何东西：usb mymac $GCC尝试（全部失败）：
gcc -o xout usbtest.c gcc -o xout usbtest.c - lusb-1.0 gcc -L / usr / local / Cellar / libusb / 1.0.9 / lib -o xout usbtest.c -lusb-1.0所有尝试的错误：
usbtest.c：3：10：致命错误：找不到'libusb.h'文件 #include< libusb.h>代码：
#include< stdio.h> #include< stdlib.h> #include< libusb.h> int main（int argc，const char * argv []） { libusb_device ** devs; libusb_context * context = NULL; size_t list; // size_t i; int ret; ret = libusb_init（& context）; if（ret <0） { perror（libusb_init）; exit（1）; } list = libusb_get_device_list（context，& devs）; printf（有％zd设备找到了\ n，列表）; 返回0;解决方案
查找头文件。这是通过gcc命令行上的 -I 选项进行编译的。
eg
gcc -I / usr / local / include -o xout usbtest.c我认为Homebrew确实提供了从酒窖内部到/ usr / local 的符号链接
I have this very simple piece of code that I'm trying to compile. I'm fairly new to GCC from the command line, so please forgive me. I've tried a quite few different things with GCC, but I'm still unable to get it to compile. I do have libusb installed. How can I get this piece of code to compile?
Libusb:
anything:usb mymac$ brew list libusb /usr/local/Cellar/libusb/1.0.9/include/libusb-1.0/libusb.h /usr/local/Cellar/libusb/1.0.9/lib/libusb-1.0.0.dylib /usr/local/Cellar/libusb/1.0.9/lib/pkgconfig/libusb-1.0.pc /usr/local/Cellar/libusb/1.0.9/lib/ (2 other files) anything:usb mymac$GCC attempts (all failed):
gcc -o xout usbtest.c gcc -o xout usbtest.c -lusb-1.0 gcc -L/usr/local/Cellar/libusb/1.0.9/lib -o xout usbtest.c -lusb-1.0Error for all attempts:
usbtest.c:3:10: fatal error: 'libusb.h' file not found #include <libusb.h>Code:
#include <stdio.h> #include <stdlib.h> #include <libusb.h> int main(int argc, const char * argv[]) { libusb_device **devs; libusb_context *context = NULL; size_t list; //size_t i; int ret; ret = libusb_init(&context); if(ret < 0) { perror("libusb_init"); exit(1); } list = libusb_get_device_list(context, &devs); printf("There are %zd devices found\n", list); return 0; }解决方案
You are not telling gcc where to look for the header files. This is done by the -I option on the gcc command line for compiling.
e.g.
gcc -I /usr/local/include -o xout usbtest.cI think Homebrew does provide a symbolic link frominside the Cellar to /usr/local
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