LIBC_SUPPORT := 1

LIBC_SUPPORT是一个变量，其值为1表示当前系统支持使用标准C库。在Makefile中，可以使用LIBC_SUPPORT变量来控制编译过程中是否链接C库。如果LIBC_SUPPORT的值为1，则会链接C库；如果值为0，则不会链接。这个变量通常在操作系统内核的Makefile中使用，以便针对不同的系统进行编译。

关于LIBC_SUPPORT的更多信息，需要查看使用该变量的Makefile文件。可以使用类似于以下命令的方式在Linux系统中查找Makefile文件：

find / -name "Makefile" -print 2>/dev/null

该命令可以在系统中查找名为Makefile的所有文件，并将结果输出到终端。可以根据具体情况进行调整，以便查找到正确的Makefile文件。

相关问题

- Checking support for ARCHIVE_CRYPTO_MD5_LIBC -- not found是什么错误

这个错误信息表示系统正在检查ARCHIVE_CRYPTO_MD5_LIBC功能是否可用，但是未找到该功能。

ARCHIVE_CRYPTO_MD5_LIBC是一个功能，它提供了在Libarchive库中使用MD5消息摘要算法的支持，具体使用系统的libc（C标准库）提供的实现。

如果您需要此功能用于您的应用程序或项目，您可能需要在系统上安装适当的库或软件包。这将根据您的操作系统和发行版而有所不同。安装库后，您可能需要重新运行配置检查，以验证ARCHIVE_CRYPTO_MD5_LIBC功能现在是否可用。

/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/crt1.o: In function `_start':

`_start` is a special function in the C runtime library that is called at the beginning of a program's execution. The error message you provided indicates that there was an issue with the `_start` function in the `crt1.o` object file, which is a system file that is linked into your program automatically by the linker.

This error message suggests that there may be a problem with your compiler or the system libraries on your machine. One possible cause of this error is a missing or corrupt `libc` library, which provides the standard C library functions used by many programs. You may want to try reinstalling your system's C runtime libraries to see if that resolves the issue.

It's also possible that there is a problem with your code itself, such as a missing `main` function. Make sure that your code is properly structured and free of syntax errors.

If you're still having trouble, you may want to consult with a more experienced programmer or seek help from online forums or support communities.