什么是构建依赖性？
"Build dependencies" explained in the cargo book:
You can depend on other Cargo-based crates for use in your build scripts. Dependencies are declared through the
build-dependenciessection of the manifest
I have difficulty in understanding what exactly this means and what's the difference between the normal dependencies and build-dependencies.
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它们有点不同：
依赖项：您可以在通常的src目录下使用它们，该目录通常是您为主程序编写源代码build依赖性：您可以在build.rs中使用它们 ，该用于准备一些外部（即系统范围的共享库）或调用外部命令（即在构建程序之前，C或C ++编译器）。build.rs称为“ nofollow noreferrer”>“构建脚本。”They're a bit different:
dependencies: You can use them under the usualsrcdirectory which is normally you write your source code for the main programbuild-dependencies: You can use them only inbuild.rson project root, which is used to prepare some external (i.e. system-wide shared library) dependencies or invoke external command (i.e. the C or C++ compiler) before the program being built. Thebuild.rsis called "build script."