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build & ci: update to NDK r27c API level 29

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Update to the latest LTS version NDK r27c (27.2.12479018),
the previous NDK are unsupported by Google, see:
https://developer.android.com/ndk/downloads

A build with NDK r27c and API level < 29 returns this error:
"executable's TLS segment is underaligned: alignment is 8 (skew 0), needs to be at least 64 for ARM64 Bionic"

Update the API level to 29 to use the native ELF LTS and avoid the error:
https://android.googlesource.com/platform/bionic/+/HEAD/docs/elf-tls.md
https://android.googlesource.com/platform/bionic/+/HEAD/android-changes-for-ndk-developers.md#elf-tls-available-for-api-level-29

A dynamic link build of Stockfish uses these libraries:

ldd stockfish-android-armv8-dynamic-api35
        libm.so => /system/lib64/libm.so
        libdl.so => /system/lib64/libdl.so
        libc.so => /system/lib64/libc.so
        ld-android.so => /system/lib64/ld-android.so

ld-android.so : the dynamic linker used by Android (on Linux is named ld-linux.so),
                responsible for loading and linking shared libraries into an executable at runtime.
libdl.so      : interface/library layer that provides function for dynamic loading,
                relies on the underlying functionality provided by the dynamic linker
libm.so       : math library for Android
libc.so       : standard C library for Android

References:
Doc for native (C/C++) API
https://developer.android.com/ndk/guides/stable_apis

C libraries (libc, libm, libdl):
https://developer.android.com/ndk/guides/stable_apis#c_library

Bionic changes with API levels:
https://android.googlesource.com/platform/bionic/+/HEAD/docs/status.md

NDK r27c build system:
https://android.googlesource.com/platform/ndk/+/ndk-r27-release/docs/BuildSystemMaintainers.md

CI: Update to NDK r27c (27.2.12479018), the default version in GitHub runner,
to switch to a recent clang 18.

A PGO build requires static linking, because the NDK doesn't ship
the Android loaders (linker/linker64), see:
https://groups.google.com/g/android-ndk/c/3Ep6zD3xxSY

The API level should not be an issue when distributing a static build,
use the API 29, the oldest one not affected by the LTS alignement issue.

closes https://github.com/official-stockfish/Stockfish/pull/6081

No functional change
This commit is contained in:
ppigazzini
2025-05-25 21:28:53 +02:00
committed by Joost VandeVondele
parent bebffc5622
commit e3adfaf8fc
4 changed files with 16 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files
.github/ci/arm_matrix.json
+6 -6
View File
@@ -4,7 +4,7 @@
"name": "Android NDK aarch64",
"os": "ubuntu-22.04",
"simple_name": "android",
"compiler": "aarch64-linux-android21-clang++",
"compiler": "aarch64-linux-android29-clang++",
"emu": "qemu-aarch64",
"comp": "ndk",
"shell": "bash",
@@ -14,7 +14,7 @@
"name": "Android NDK arm",
"os": "ubuntu-22.04",
"simple_name": "android",
"compiler": "armv7a-linux-androideabi21-clang++",
"compiler": "armv7a-linux-androideabi29-clang++",
"emu": "qemu-arm",
"comp": "ndk",
"shell": "bash",
@@ -26,25 +26,25 @@
{
"binaries": "armv8-dotprod",
"config": {
"compiler": "armv7a-linux-androideabi21-clang++"
"compiler": "armv7a-linux-androideabi29-clang++"
}
},
{
"binaries": "armv8",
"config": {
"compiler": "armv7a-linux-androideabi21-clang++"
"compiler": "armv7a-linux-androideabi29-clang++"
}
},
{
"binaries": "armv7",
"config": {
"compiler": "aarch64-linux-android21-clang++"
"compiler": "aarch64-linux-android29-clang++"
}
},
{
"binaries": "armv7-neon",
"config": {
"compiler": "aarch64-linux-android21-clang++"
"compiler": "aarch64-linux-android29-clang++"
}
}
]