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fix: SIGSEGV in getauxval — override broken CRT stub with dlsym wrapper

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compiler-rt's init_have_lse_atomics calls getauxval(AT_HWCAP) at
library load time. The static getauxval from the CRT reads from
__libc_auxv which is NULL in shared libraries → SIGSEGV at 0x0.

Fix: compile getauxval_fix.c that provides a getauxval() which uses
dlsym(RTLD_DEFAULT) to find the real bionic getauxval at runtime.
Also switch to libc++_shared.so (bundled in APK) to avoid pulling
in static libc stubs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude
2026-04-05 08:39:57 +00:00
parent f6d51fce61
commit 9098e28a1f
4 changed files with 57 additions and 9 deletions
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6
.cargo/config.toml
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@@ -1,5 +1,9 @@
[target.aarch64-linux-android]
linker = "aarch64-linux-android26-clang"
rustflags = [
"-C", "target-feature=-outline-atomics",
"-C", "link-arg=-Wl,-z,lazy",
]
[target.armv7-linux-androideabi]
linker = "armv7a-linux-androideabi21-clang"
linker = "armv7a-linux-androideabi26-clang"