Build fails on Linux (GCC 15): SentencePiece missing <cstdint> + Highway avx10.2-512 errors

[colinrobinsonuib]

Summary

Building gemma.cpp on Linux with GCC 15 fails due to issues in third-party dependencies:

1. CMake fails version check
2. sentencepiece headers fail to compile due to missing include

Environment

• OS: Arch Linux
• cmake: 4.1.2
• clang: 21.1.6
• gcc: 15.2.1
• gemma.cpp: latest main (Nov 2025)

Workaround Build steps

1) Specify clang and cmake version compatibility

CC=clang CXX=clang++ cmake --preset make -DCMAKE_POLICY_VERSION_MINIMUM=3.5

2) Add missing include in sentencepiece

sed -i '24i #include <cstdint>' build/_deps/sentencepiece-src/src/sentencepiece_processor.h

3) Build

cmake --build --preset make -j$(nproc)

[jan-wassenberg]

Thanks for reporting. I will see if I can get the patch into sentencepiece.

What's the issue with the CMake policy/version?

[colinrobinsonuib]

CMake Error at build/_deps/sentencepiece-src/CMakeLists.txt:15 (cmake_minimum_required): Compatibility with CMake < 3.5 has been removed from CMake. 

Update the VERSION argument <min> value. Or, use the <min>...<max> syntax to tell CMake that the project requires at least <min> but has been updated to work with policies introduced by <max> or earlier. 

Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.

[jan-wassenberg]

FYI the include change is now in our internal sentencepiece repo but not yet synced with github.

Thanks for sharing the error. We do specify cmake_minimum_required(VERSION 3.11) - I wonder if CMake is somehow misinterpreting that as 3.1?