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[native_toolchain_c] Use 16 kb pages for Android by default #1740

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merged 3 commits into from
Nov 20, 2024

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dcharkes
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Closes: #1611

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// Copyright (c) 2024, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
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@dcharkes dcharkes requested a review from mkustermann November 20, 2024 15:36
@dcharkes dcharkes changed the title Android 15 page size [native_toolchain_c] Use 16 kb pages for Android by default Nov 20, 2024
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Coverage Status

coverage: 89.814% (-0.4%) from 90.198%
when pulling 76d23b0 on android-15-page-size
into ee2215e on main.

@@ -67,6 +67,9 @@ void main() {
.firstWhere((e) => e.contains('file format'));
expect(machine, contains(objdumpFileFormat[target]));
}
if (linkMode == DynamicLoadingBundled()) {
await expectPageSize(libUri, 16 * 1024);
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Do we have evidence of users running into this issue?

Not all users will use package:native_toolchain_c, some may ship binaries, etc. So we could add build output validation for this that will apply to all code assets.

if (targetOS == OS.android && androidVersion >= ...) {
  ensurePageSizeIs16Kb(...);
}

somewhere in

Future<ValidationErrors> _validateCodeAssetBuildOrLinkOutput(

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Do we have evidence of users running into this issue?

So we could add build output validation for this that will apply to all code assets.

We're not mandating readelf or objdump currently. Flutter provides access to a compiler, linker, and archiver via cCompiler. But we don't have something similar for commandline utilities at the moment.

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androidVersion

We don't have an android version. Only a minAndroidSdkVersion. But the minAndroidSdk doesn't matter, something compiled with a lower min SDK trying to run on Android 15 will still fail to load the dylib if the page-size is smaller than 16kb.

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Thanks @mkustermann!

I've filed #1741 to add the command-line utilities somewhere so that we can rely on them and report users via a doctor command if the utilities are not there.

@auto-submit auto-submit bot merged commit 7afad0b into main Nov 20, 2024
38 checks passed
@auto-submit auto-submit bot deleted the android-15-page-size branch November 20, 2024 16:14
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[native_toolchain_c] Android 15 16kb elf alignment
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