Rust货物:如何在启用特定功能时为dep使用不同的功能？

Question

例如,我定义了2个没有依赖项的功能:

[features]
default = []
py2 = []
py3 = []

基于所选的功能(--features py3)我想为依赖项(cpython)启用不同的功能:

[dependencies.cpython]
default-features = false
# features = ["python27-sys"]      I want to select this if py2 is enabled
features = ["python3-sys"]
optional = true

我可以这样做吗？或者我也可以从命令行中为依赖项选择功能吗？

Answer 1

这里讨论过.人们可以做到这一点/.

[features]
default = []
py2 = ["cpython", "cpython/python27-sys"]
py3 = ["cpython", "cpython/python3-sys"]
unstable = []

[dependencies.cpython]
# git = "https://github.com/dgrunwald/rust-cpython.git"
default-features = false
optional = true

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