Hi Li, I was just writing this.
AFAIK, currently the Arrow C++ build system does not take prebuilt Substrait C++ classes. The usual way is rebuilding Arrow C++ with a custom Substrait repository, which is done by setting ARROW_SUBSTRAIT_URL to a local Substrait repository. You can download this repository offline and make it available to your internal build system. With this, the Arrow C++ build system auto-generates the Substrait C++ classes for the local Substrait repository and builds into "libarrow_bundled_dependencies.a". I wouldn't recommend doing these auto-generation and build steps on your own, as you'd have to change the Arrow C++ build system, and specifically "cpp/cmake_modules/ThirdpartyToolchain.cmake", to enable this. Yaron. ________________________________ From: Jeroen van Straten <jeroen.van.stra...@gmail.com> Sent: Monday, July 18, 2022 2:27 PM To: dev@arrow.apache.org <dev@arrow.apache.org> Subject: Re: [C++] Question about substrait dependency in C++ Hi, I'm not sure I completely understand what you're trying to do, but if lack of internet access is the only problem, I think you should just be able to override the URL it tries to download by setting the ARROW_SUBSTRAIT_URL environment variable to some local file:// URL. I think it should work as long as the hash matches what Arrow's build system expects from thirdparty/versions.txt. I'm not sure why you're not seeing the library. With `--preset ninja-debug`, I'm getting a libsubstrait.a in build/debug. I'm not familiar enough with Arrow's build system to provide more help there. Regards, Jeroen On Mon, 18 Jul 2022 at 18:00, Li Jin <ice.xell...@gmail.com> wrote: > Hello! > > I am working on integrating the latest Arrow C++ into our internal build > system. Currently I am planning to build substrait C++ classes > independently and provide header locations and so files to the Arrow > Cmakefile - I wonder if that is a good approach? (We cannot download the > substrait tarball in the internal build system when building Arrow) > > Also, I don't see a libsubstrait.so or libsubstrait.a in the build > directory - is that statically linked? > > Thanks, > Li >
