[6.2.1][build] Make it possible to build a cross-compilation toolchain for Android, including Testing#83809
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shahmishal merged 5 commits intoswiftlang:release/6.2.1from Sep 18, 2025
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Android 15+ requires that native libraries be compiled with a linker flag to support 16 KB page sizes. See: https://developer.android.com/guide/practices/page-sizes#compile-r26-lower
…` from fcc0389, specifically the change that makes the following possible on linux: "* under Linux, do not cross compile LLVM when building for the host architecture -- that will ensure that the compiler-rt build will use the just built compiler and not the system one (which may not be new enough for this purpose);"
…wiftlang#83260) Also, disable a recently failing test for Android armv7.
This new flag makes it easy to build Swift cross-compilation toolchains, by disabling cross-compilation of all host tools, like the Swift compiler and various macros, building on prior pulls swiftlang#38441 and swiftlang#82163. Also, add two class methods to the Testing macros product so it works with swiftlang#83260.
I missed that `build-script` passes back `false` instead, so use the `true_false` function for broader checking.
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@swift-ci test |
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@tbkka, would you review? @shahmishal, do you think we can get this into 6.2.0? |
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@adrian-prantl, Tim and Mishal appear to be busy, mind reviewing? |
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Pinging @tbkka again: this should be completely safe, no complaints on the release/6.2 branch, where it was previously merged. |
shahmishal
approved these changes
Sep 18, 2025
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Explanation: Add a linker flag for the upcoming 16 KB page support in Android, generate an Android CMake toolchain file that can be used to cross-compile repos like cmark and Testing, and add a build flag that makes it easy to build cross-compilation toolchains, by disabling the cross-compilation of all host tools and macros for listed
--cross-compile-hosts, leaving only the Swift runtime libraries in a cross-compilation SDK.Scope: Build changes that either only affect Android or have to be explicitly enabled with a new
build-scriptflagIssue: #80788
Original PR: #81596, single supporting change from #81386, #83260, #83422, #83629
Risk: Very low, only affects Android plus runs two tests for more non-Android CI target platforms
Testing: Passed both trunk and release/6.2 CI and we're using these patches in preliminary builds of an official Android CI job, which uses these changes to pass the full compiler validation suite and produce an Android SDK bundle
Reviewer: @tbkka
The Swift core team tasked the Swift on Android workgroup with putting together an official 6.2 Android CI job, so @marcprux and I have been piecing together a pull for that, swiftlang/swift-docker#467, and these are some of the last trunk patches we had to backport to 6.2.