Building for iOS: requested alignment must be 536870912 bytes or smaller

[Richard]

I'm getting this error when building for iOS:

In file included from ../../v8/v8/src/builtins/builtins-async-iterator-gen.cc:11:

In file included from ../../v8/v8/src/execution/frames-inl.h:13:

In file included from ../../v8/v8/src/objects/objects-inl.h:21:

In file included from ../../v8/v8/src/heap/heap-write-barrier-inl.h:15:

In file included from ../../v8/v8/src/objects/compressed-slots-inl.h:10:

../../v8/v8/src/common/ptr-compr-inl.h:25:35: error: requested alignment must be 536870912 bytes or smaller; maximum alignment assumed [-Werror,-Wbuiltin-assume-aligned-alignment]

  ret = reinterpret_cast<Address>(V8_ASSUME_ALIGNED(

                                  ^~~~~~~~~~~~~~~~~~

../../v8/v8/include/v8config.h:388:3: note: expanded from macro 'V8_ASSUME_ALIGNED'

  __builtin_assume_aligned((ptr), (alignment))

  ^                               ~~~~~~~~~~~

1 error generated.

My build settings are:

enable_ios_bitcode = true

ios_deployment_target = 10

is_component_build = false

is_debug = false

target_cpu = "arm64"

target_os = "ios"

use_custom_libcxx = false

use_xcode_clang = true

v8_enable_i18n_support = false

v8_monolithic = true

v8_use_external_startup_data = false

Any ideas how to fix this?

[Jakob Gruber]

Try turning off pointer compression: https://source.chromium.org/chromium/chromium/src/+/main:v8/BUILD.gn;l=121;drc=f98f496f9e5e9faea58e1de737d9d46e2248b337

Let us know if it works, we should update the iOS instructions page if so.

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[Clemens Backes]

Alternatively, remove that use of V8_ASSUME_ALIGNED. It's just a hint for the compiler, it's not needed for correctness.

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Clemens Backes

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[Richard]

It looks like that fixed it. There are some general build errors now, but if they pose a problem, I'll post again.

Thanks!

[Richard]

Turning off pointer compression was the solution...

[Jakob Gruber]

Updating instructions here https://github.com/v8/v8.dev/pull/549 (feel free to create pull requests yourself if you have addtl improvements).

To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/a803636a-2fa2-46b7-b7fb-0aa5acbd72e9n%40googlegroups.com.