[cross-build] Specifying target-os fails to link a shared library on macOS

[theodelrieu]

Hello,

I've stumbled across a weird behaviour related to target-os and shared libraries, while building atomic (I'm on macOS):

• cd boost/libs/atomic/build
• run b2 toolset=clang link=shared target-os=iphone

The macOS linker complains about --start-group (--end-group is unrecognized as well).

Removing the target-os works.

[stale]

Thank you for your contributions. Main development of B2 has moved to https://github.com/bfgroup/b2
This issue has been automatically marked as "transition" to indicate the potential for needing transition to the new B2 development project.