tree 22ecec387e3d0f559d679873d1224f0c7ecf7130
parent e8d7667d37421f50d61e3a4e30199b1a0b86db6c
author Martin Storsjö <martin@martin.st> 1651873060 +0300
committer Copybara-Service <copybara-worker@google.com> 1654546851 -0700

[libcxxabi] Check __SEH__, when checking if ARM EHABI is implied

ARM EHABI isn't signalled by any specific compiler builtin define,
but is implied by the lack of defines specifying any other
exception handling mechanism, `__USING_SJLJ_EXCEPTIONS__` or
`__ARM_DWARF_EH__`.

As Windows SEH also can be used for unwinding, check for the
`__SEH__` define too, in the same way.

Differential Revision: https://reviews.llvm.org/D126866

GitOrigin-RevId: 4a3722a2c3dff1fe885cc38bf43d3c095c9851e7