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Android 16kb Page Alignment #129

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Merged
lukejmann merged 1 commit into from
Jan 16, 2026
Merged

Android 16kb Page Alignment #129

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40 changes: 40 additions & 0 deletions .cargo/config.toml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
# Configuration for direct cargo builds (without cross)

# max-page-size=16384:
# Android 15 (API 35) introduces support for 16KB page sizes to improve performance on devices with larger RAM.
# Apps with native libraries MUST be compiled with 16KB ELF alignment or they will crash on startup
# on devices configured with 16KB page sizes. This flag ensures proper alignment for both 32-bit and 64-bit targets.
# Reference: https://developer.android.com/guide/practices/page-sizes
# common-page-size=4096:
# -z max-page-size=16384 is what makes the ELF safely load on 16 KB-page kernels. Bumping -z common-page-size to 16 KB doesn’t improve compatibility, but it does increase padding and memory waste on 4 KB devices.
[target.aarch64-linux-android]
rustflags = [
"-Clink-arg=-z",
"-Clink-arg=max-page-size=16384",
"-Clink-arg=-z",
"-Clink-arg=common-page-size=4096",
]

[target.armv7-linux-androideabi]
rustflags = [
"-Clink-arg=-z",
"-Clink-arg=max-page-size=16384",
"-Clink-arg=-z",
"-Clink-arg=common-page-size=4096",
]

[target.i686-linux-android]
rustflags = [
"-Clink-arg=-z",
"-Clink-arg=max-page-size=16384",
"-Clink-arg=-z",
"-Clink-arg=common-page-size=4096",
]

[target.x86_64-linux-android]
rustflags = [
"-Clink-arg=-z",
"-Clink-arg=max-page-size=16384",
"-Clink-arg=-z",
"-Clink-arg=common-page-size=4096",
]
7 changes: 7 additions & 0 deletions Cross.toml
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@@ -1,3 +1,10 @@
# max-page-size=16384:
# Android 15 (API 35) introduces support for 16KB page sizes to improve performance on devices with larger RAM.
# Apps with native libraries MUST be compiled with 16KB ELF alignment or they will crash on startup
# on devices configured with 16KB page sizes. This flag ensures proper alignment for both 32-bit and 64-bit targets.
# Reference: https://developer.android.com/guide/practices/page-sizes
RUSTFLAGS = "-C link-arg=-Wl,-z,max-page-size=16384"

[build]
pre-build = [
"dpkg --add-architecture $CROSS_DEB_ARCH",
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