--with-cross-build

`--with-cross-build` 是在使用 CMake 构建项目时的一个选项。它用于指定一个交叉编译的构建目录，这个目录中包含了编译器和其他构建工具，以及构建出的库和可执行文件。这个选项通常用于在不同的操作系统或架构上交叉编译程序。

在使用该选项时，CMake 会在指定的交叉编译构建目录中查找编译器、库和头文件等构建工具，而不是在本地机器上查找。这样可以确保在不同的操作系统或架构上构建程序时，使用的编译器和库等工具都是正确的。

通常，使用 `--with-cross-build` 选项的命令行示例如下：

cmake --build build --target install --with-cross-build=/path/to/cross-build

这条命令表示在构建项目时，使用 `/path/to/cross-build` 目录中的编译器和库等工具进行交叉编译，并将构建出的程序安装在本地机器上。

相关问题

supplied as the argument to --with-cross-build. Use an absolute path

This error message is related to the installation of a package or library in a Unix-like system. It means that a relative path was used as an argument to the `--with-cross-build` option instead of an absolute path.

To fix this error, you need to provide an absolute path as an argument to the `--with-cross-build` option. An absolute path is a path that starts from the root directory (`/`), while a relative path is a path that starts from the current directory (`.`).

To get the absolute path of a directory, you can use the `pwd` command, which stands for "print working directory". For example, if you want to use the directory `/home/user/my-project` as the argument to `--with-cross-build`, you can run the following command:

./configure --with-cross-build=/home/user/my-project

Alternatively, you can use the `readlink` command to get the absolute path of a directory. For example:

./configure --with-cross-build=$(readlink -f /path/to/directory)

Replace `/path/to/directory` with the actual path to the directory you want to use.

No such directory /home/gz/opencv_qt/icu/build-arm/config/icucross.mk supplied as the argument to --with-cross-build. Use an absolute path.

这个错误可能是由于你的路径不正确引起的。你需要提供一个完整的绝对路径，而不是相对路径。建议你检查一下路径是否正确，然后再次运行命令。例如：

./configure --host=arm-linux-gnueabi --with-cross-build=/home/user/icu/source/icu4c/source

请将上面的 `/home/user/icu/source/icu4c/source` 替换为你实际的路径。