Summary of Crust of Rust: Build Scripts and Foreign-Function Interfaces (FFI)

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00:00:00 - 01:00:00

This video discusses how to build scripts and foreign-function interfaces (FFIs) in Rust. The author suggests that you use the cargo colon key equals value syntax to declare environment variables for downstream builds to consume.

00:00:00 This YouTube video explains how to create foreign function interfaces (FFI) in Rust, and how build scripts can be used to help with this process.
00:05:00 The build script in a Rust project is a program that defines a main function, and it runs when the project is compiled. The build script gets access to environmental variables, and when a crate is compiled, the build script sets the environment variable "outdoor" to the output directory for the crate.
00:10:00 The author discusses how to use the cargo targeter environment variable to simplify cross-project builds. He also shows how to use the end macro to specify the location of the build output.
00:15:00 The video discusses the relationship between build scripts and crates, and how build scripts can communicate with cargo to determine which shared libraries to link against.
00:20:00 This video introduces the concept of foreign function interfaces (FFI), and shows how to use different cargo options to control the compilation of aRust project. The main points covered include using cargo config to create Rusty config flags, and using cargo warnings to generate warnings during compilation.
00:25:00 This video discusses how to build scripts and foreign-function interfaces (FFIs) in Rust. The author suggests that you use the cargo colon key equals value syntax to declare environment variables for downstream builds to consume.
00:30:00 The "Crust of Rust" video discusses how to create libraries that use foreign functions, and how to create build scripts that rerun if changed.
00:35:00 Build scripts are tools that are implicitly trusted because they are automatically built and run for all dependencies. They can be troubling because you don't really control what build scripts your dependencies have.
00:40:00 This YouTube video explains how to use package config to bind to a library that is system-provided. Package config is a thin wrapper around a Unix command that allows you to specify information about a library, such as its location and version.
00:45:00 The video walks through the process of building libgit2 from source, explaining the steps involved. Libgit2 is built using the CC crate, which provides wrapper around a standard C compiler. Once the build is successful, Rusty link properties are emitted which are used by the CC crate to generate the necessary files for linking.
00:50:00 Bindgen helps you create Rust bindings to C libraries, automatically generating code that corresponds to the C function definitions and type definitions in an interface header file.
00:55:00 This video walksthrough how to create a foreign function interface in Rust. The author explains that declaring an extern block with an "FN" keyword changes the calling convention used for the function, and that any struct declared with extern must be wrappers around a Rust type that can be used over the C call. This allows for more control over the exact layout of types and the memory management.

01:00:00 - 02:00:00

This video demonstrates how to generate bindings for a C library using the bindgen tool, and how to use these bindings to create foreign function interfaces in Rust. It also covers how to check the requirements of the function, and how to return errors or success depending on the outcome of the call.

01:00:00 Bindgen is a library that helps generate Rust bindings for C code. It is a dependency of the build script, and can be used to automatically generate bindings for a given C header file. Bindgen can generate bindings for both debug and release builds, and can produce warnings if bindings are not correctly generated.
01:05:00 This video demonstrates how to generate Rust bindings for a library, and how to do this for a library that uses a different C library. The video also covers how to use the bindgen tool to do this.
01:10:00 The video describes various bindinggen configuration options, including the ability to specify which library to use (via the VC package), what include paths to set, and how to set version requirements.
01:15:00 The video discusses various build scripts and foreign function interfaces for various libraries. It mentions libsodium, which is not particularly relevant to the topic at hand.
01:20:00 In this video, the speaker shows how to install and use the libsodium library, as well as how to generate bindings for it. They also mention the importance of including a version requirement in the bindings, and how to run the build script if the bindings need to be updated.
01:25:00 The video demonstrates how to generate bindings for a foreign function in Rust using the bindgen tool. The user demonstrates how to opt-out of a built-in cargo instruction that causes problems when debugging.
01:30:00 This video demonstrates how to create foreign function interfaces (FFIs) in Rust using the crate "crate::ffi". If an error occurs while using an FFI, then the user will see an error message that includes the path to the offending function.
01:35:00 In this video, the speaker explains how to write bindings from a favorite language, starting with the crypto generic cache API. The speaker then discusses how to do foreign function interface (FFI) in Rust, and mentions that they will also try to bind the Crypt generic cache.
01:40:00 The author discusses how to build foreign function interfaces (FFI) in Rust, and how to assert that the output size of a function is at least a certain size.
01:45:00 The video discusses how to build foreign-function interfaces (FFIs). The main points are that consts must be defined as u32s, and that minimum and maximum output size requirements must be met.
01:50:00 This 1-minute video explains how to build foreign function interfaces in Rust, by transforming a function into a type that the Rust language can understand. The video also discusses how to check the requirements of the function, and how to return errors or success depending on the outcome of the call.
01:55:00 The video demonstrates how to use the crypto generic hash function to generate a hash of arbitrary data. The function requires a size parameter, and the output bytes are set to the hash of the data passed in.

02:00:00 - 02:15:00

This video explains how to use build scripts and foreign function interfaces (FFIs) in Rust. The presenter shows how to create a basic hash function, wrap it in a safe wrapper, and use it in a C code module. They also discuss how to use the Crust of Rust build script tool to help manage the compilation and installation of Rust code.