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Fix unwinding on OS X 10.9. #10013

Merged
merged 1 commit into from
Oct 22, 2013
Merged

Fix unwinding on OS X 10.9. #10013

merged 1 commit into from
Oct 22, 2013

Commits on Oct 22, 2013

  1. Fix unwinding on OS X 10.9. 

    OS X 10.9's linker has a bug that results in it failing to preserve
DWARF unwind information when passed the -no_compact_unwind flag.
This flag is passed on OS X because the unwind information for
__morestack cannot be represented by the compact unwind format.

We can work around this problem by using a more targeted approach
to disabling compact unwind information. The OS X linker looks for
a particular pattern in the DWARF unwind information and will not
attempt to convert the unwind information to the compact format.
The pattern in question is the return address register being saved
twice to the same location.

Fixes #6849.
    @bdash
    bdash committed Oct 22, 2013
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