I tried to build an older version of V8 for android. Target version is 6.5 https://v8.dev/blog/v8-release-65
Building guide is here: https://v8.dev/docs/build
git clone https://github.com/v8/v8
cd v8
git checkout 6.5-lkgr
build/install-build-deps-android.sh
echo "target_os = ['android']" >> ../.gclient && gclient sync
After the above steps, I see below settings in v8/src/include/v8-version.h
define V8_MAJOR_VERSION 7
define V8_MINOR_VERSION 3
define V8_BUILD_NUMBER 0
define V8_PATCH_LEVEL 0
This is strange to me. Because this guide does the same steps but it succeeded.