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[clang] Document -femit-compact-unwind option in the User’s Manual 

Reviewed By: #lld-macho, thakis

Differential Revision: https://reviews.llvm.org/D129772
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Jez Ng 2022-07-14 16:46:15 -04:00
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clang/docs/UsersManual.rst
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@ -843,6 +843,23 @@ a special character, which is the convention used by GNU Make. The -MV
option tells Clang to put double-quotes around the entire filename, which
is the convention used by NMake and Jom.
.. option:: -femit-dwarf-unwind=<value>
When to emit DWARF unwind (EH frame) info. This is a Mach-O-specific option.
Valid values are:
* ``no-compact-unwind`` - Only emit DWARF unwind when compact unwind encodings
aren't available. This is the default for arm64.
* ``always`` - Always emit DWARF unwind regardless.
* ``default`` - Use the platform-specific default (``always`` for all
non-arm64-platforms).
``no-compact-unwind`` is a performance optimization -- Clang will emit smaller
object files that are more quickly processed by the linker. This may cause
binary compatibility issues on older x86_64 targets, however, so use it with
caution.
.. _configuration-files:
Configuration files