How to distinguish arm64 and armhf in Jamfile.v2?

[UMU618]

I want to do different things depending on the CPU architecture, such as:

if [ os.platform ] = ARM {
  if [ ? ] = ?? {
     .var = arm64
  } else if [ ? ] = ?? {
    .var = armhf
  }
}

ECHO $(.var) ;

[grafikrobot]

If you are asking about obtaining the compile target architecture at jam parse time, it's not possible. As that can have multiple answers depending on what the user asks for. For example one could ask to build with architecture=x86,arm,mips.

If you are asking something else, can you provide the context of what you are trying to achieve? I.e. why/where/when do you need to know the architecture target?

[UMU618]

I try to write a Jamfile that can support all native platform and cross-compile.

https://github.com/ksyun-kenc/liuguang/blob/main/src/deps/b2/os-paths.jam

eg: I use CC=ARM64 b2 toolset=gcc-arm64 to cross compile on WSL2.

When native compile on Surface RT with Linux installed, I'd like to add a armhf path.