Description
I'm currently trying to generate bindings for libyara in a cross-compilation setup: Generating bindings for Windows-MSVC while running on Linux.
To do so, I have a complete cross-compilation toolchain: The full MSVC SDK is installed on my linux machine, and clang/lld are configured to find the appropriate headers and link the appropriate libs automatically. The problem is, bindgen doesn't appear to offer a way to set-up per-target environment variables to tell it which clang binary to use, or where to find the includes.
For comparison, the cc crate has a handful of environment variables that can be set per target to configure your toolchain. For instance, you can set CC_X86_64_PC_WINDOWS_MSVC to specify the path to cc only when building for the x86_64-pc-windows-msvc target.
Bindgen has the BINDGEN_EXTRA_CLANG_ARGS environment variable, but it can't be set per-target. Ideally, we should have BINDGEN_EXTRA_CLANG_ARGS_X86_64_PC_WINDOWS_MSVC, allowing us to set up the system includes when building for that specific target.