![]() Swift's build tooling is meant to support spaces in the paths passed to them, -but using spaces sometimes tickles bugs in Swift's build scripts or the tools -they rely on. Check this document for the current required version. The required version of Xcode changes frequently, and is often a beta release. # macOS -To build for macOS, you need (). # System Requirements -macOS and Ubuntu Linux LTS 18.04 are the current supported host development -operating systems. You can also skim (/docs/README.md) to understand what -high-level documentation is available. Once you are able to build things successfully and have a compile-test-debug -loop going, check out the (docs/DevelopmentTips.md) for -better productivity while working on the compiler. After that, follow the + instructions in the (#swift-toolchains) section below. +- Building a toolchain as a one-off: Follow the + up until the "Building the project" section. +- Building the compiler as a one-off: See our. +If you are interested in: +- Contributing fixes and features to the compiler: See our + (/docs/HowToGuides/FirstPullRequest.md). Naturally, incremental builds are much faster. Depending on your machine, a clean build can take a few minutes to -several hours. ![]() To build from source you will need about 2 GB of disk space for the -source code and up to 70 GB of disk space for the build artifacts with full -debugging. +++ -59,14 +59,9 (#contributing-to-swift) - (#getting-started) - (#system-requirements) - (#getting-sources-for-swift-and-related-projects) - (#building-swift) - (#swift-toolchains) - (#build-failures) - (#testing-swift) - (#learning-more) - (#build-dependencies) # Contributing to Swift -86,214 +81,15 Getting Started -These instructions give the most direct path to a working Swift development -environment. + * : Property observers such as `willSet` and `didSet` are now supported on `lazy` properties: -8070,7 +8141,10 : : +: : +: +: : : diff -git a/README.md b/README.md This is expected to be upgraded to an error in the next major version of Swift. In order to ease the transition to this new rule, cases in which the forward-scan and backward-scan match a single trailing closure to different parameters, the backward-scan result is preferred and a warning is emitted. ![]() Furthermore, the type of each member along the chain is permitted to differ (again, as long as the base of the chain matches the resulting type) meaning the following successfully typechecks: + + ```swift + struct Foo + ``` + + In the above example, the trailing closure argument matches parameter `first`, whereas pre-Swift-5.3 it would have matched `second`. white.withAlphaComponent(0.5).cgColor + ``` + + (Unless, of course, appropriate `white` and `withAlphaComponent` members were defined on `CGColor`.) + + Members of a "chain" can be properties, method calls, subscript accesses, force unwraps, or optional chaining question marks. init(named: "white")?.withAlphaComponent(0.5) + ``` + + As is the case with the existing implicit member expression syntax, the resulting type of the chain must be the same as the (implicit) base, so it is not well-formed to write: + + ```swift + let cgMilky: CGColor =. ![]() init(named: "white")!.withAlphaComponent(0.5) + let milkåhance: UIColor? =. white.withAlphaComponent(0.5) + let milky2: UIColor =. +++ -4,29 +4,100 Note: This is in reverse chronological order, so newer entries are added to the top. +++ -1,2 +1,3 "cmake" brew "ninja" +brew "sccache" diff -git a/CHANGELOG.md b/CHANGELOG.md Merge github/tensorflow into copy of github/master (using imerge) ![]()
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