Some notes:
* I am purposely trying to not do something too crazy here. My hope is that this
can tied us over until we can remove a bunch of build-script logic (after
build-script-impl is destroyed).
* Given this need for simplicity, I purposely did something really simple: I
assumed the build-graph was a DAG. This makes it really easy to compute a
topological ordering just by computing RPOT numbers from POT numbers. That is
what I did in this implementation.
I haven't wired it up to anything and just added a simple test that shows how it
can properly infer from a toy dependency tree the dependencies of a "toy
swiftpm" project.
In most cases, I followed the ordering of dependencies defined already by
build-script's product classes. In a subsequent commit I am going to add an
option (disabled by default) that schedules this via a simple topological sort
based on proving our dep graph is a DAG and using RPOT numbers.
* Need to symlink 'swift' into 'llvm-project' since we are doing a unified configure with 'swift' as an external project.
* Need to set "-DLLVM_ENABLE_LIBEDIT=FALSE" to get iOS builds working again
Support the usual `--enable-*san options`, but also add a
`--test-indexstore-db-santitize-all` that runs the tests once for each
sanitizer. Sanitizing just indexstore-db with a regular toolchain should
be much faster than using sanitized compilers.
Commit for CMake and build scripts to recognize OpenBSD. To keep this
commit relatively short, this just deals with the rather simple and
uncontroversial changes to the build system.
Note that OpenBSD calls "x86_64" as "amd64", Since the Swift stdlib will
be put in a subdirectory named after ARCH, to ensure the standard
library is properly found later, we use the native architecture name for
OpenBSD in the build system rather than trying to deal with the
difference the other way around.
Use the correct installation location path computation
`toolchain_install_path` rather than trying to compute it ourselves.
This ensures that the files are installed into the right location.
Support CMake 3.15 for the build which required changing into the build
tree before configuring/building.
Use the just-built `swiftc` to build the product.
Now that the autodifferentiation support is being upstreamed, add an
option to enable building the TensorFlow swift-apis package optionally.
This enables easier development cycles for the engineers working on it.
This migrates the playground support out of the build-script-impl and
into the python based build system. This makes it build more similarly
to the Swift Package Manager and SourceKit-LSP. More importantly, it
reduces the dependency on build-script-impl.
Add support for testing with macCatalyst to lit.cfg and the test CMake.
This adds lit test features for whether the standard library and runtime was
built with macCatalyst support:
REQUIRES: maccatalyst_support
The test suite can also be run in two modes: one where the macOS tests
are run as usual (against a zippered standard library, runtime, and overlays)
and another where iOS tests are compiled with the macCatalyst target
triple and executed as macCatalyst processes.
The iOS tests for macCatalyst can be run by passing `--maccatalyst-ios-tests`
to build-script. There are new lit test features to enable a test to specify
whether it supports that environment:
REQUIRES: OS=maccatalyst
UNSUPPORTED: OS=macCatalyst
This commit adds initial build system support for macCatalyst,
an Apple technology that enables code targeting iOS
to be recompiled so that it can be executed on macOS while still using
iOS APIs. This is the first in a series of commits building out support for
macCatalyst in the compiler, runtime, standard library, and overlays. Swift
for macCatalyst represents the work of multiple people, including
Devin Coughlin, Ross Bayer, and Brent Royal-Gordon.
Under macCatalyst, compiler-provided shared libraries (including overlays)
are built as one of four kinds (or "flavors") of libraries,
each with different install names and Mach-O load commands. This commit
adds the build system infrastructure to produce these different
library flavors.
**macOS-like Libraries**
A "macOS-like" library (such as the GLKit overlay) is a plain-old macOS library
that can only be loaded into regular macOS processes. It has a macOS slice with
a single load command allowing it to be loaded into normal macOS processes.
**iOS-like Libraries**
An "iOS-like" library, such as the UIKit overlay, is a library with a
macOS slice but with a load command that only allows it be loaded into
macCatalyst processes. iOS-like libraries are produced by passing a new
target tuple to the compiler:
swiftc ... -target x86_64-apple-ios13.0-macabi ...
Here 'ios' (and an iOS version number) is used for OS portion
of the triple, but the 'macabi' environment tells the compiler
that the library is intended for macCatalyst.
**Zippered Libraries**
A "zippered" library can be loaded into either a macCatalyst process or
a standard macOS process. Since macCatalyst does not introduce a new Mach-O
slice, the same code is shared between both processes. Zippered libraries
are usually relatively low level and with an API surface that is similar
between macOS and iOS (for example, both the Foundation overlay and the Swift
Standard Library/Runtime itself are zippered).
Zippered libraries are created by passing both the usual `-target`
flag to the compiler and an additional `-target-variant` flag:
swiftc ... -target x86_64-apple-macos10.15 \
-target-variant x86_64-apple-ios13.0-macabi
Just like the -target flag, -target-variant takes a target tuple.
This tells the compiler to compile the library for the -target tuple but
to add an extra load command, allowing the library to be loaded into processes
of the -target-variant flavor as well.
While a single zippered library and slice is shared between macOS and
macCatalyst, zippered libraries require two separate .swiftinterface/.swiftmodule
files, one for macOS and one for macCatalyst. When a macOS or macCatalyst client
imports the library, it will use module file for its flavor to determine what
symbols are present. This enables a zippered library to expose a subset of its
target APIs to its target-variant.
**Unzippered-Twin Libraries**
"Unzippered Twins" are pairs of libraries with the same name but different
contents and install locations, one for use from macOS processes and one for
use from macCatalyst processes. Unzippered twins are usually libraries that
depend on AppKit on macOS and UIKit on iOS (for example, the MapKit overlay)
and so do not share a common implementation between macOS and macCatalyst.
The macCatalyst version of an unzippered twin is installed in a parallel
directory hierarchy rooted at /System/iOSSupport/. So, for example, while macOS
and zippered Swift overlays are installed in /usr/lib/swift/, iOS-like and
the macCatalyst side of unzippered twins are installed in
/System/iOSSupport/usr/lib/swift. When building for macCatalyst, the build system
passes additional search paths so that the macCatalyst version of libraries is
found before macOS versions.
The add_swift_target_library() funciton now take an
optional MACCATALYST_BUILD_FLAVOR, which enables swift libraries to indicate
which flavor of library they are.
This new module uses the build_swift.shell.ExecutableWrapper API to create a wrapper class around 'xcrun'. The wrapper class is instantiated and exposed under the name build_swift.wrappers.xcrun.
