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From: "egall at gwmail dot gwu.edu" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/65931] [5/6 regression] dsymutil assertion failure building libgnat-5.dylib
Date: Thu, 30 Apr 2015 16:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65931

Eric Gallager <egall at gwmail dot gwu.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |egall at gwmail dot gwu.edu

--- Comment #1 from Eric Gallager <egall at gwmail dot gwu.edu> ---
(In reply to Rainer Orth from comment #0)
> For about two weeks (thus affecting both the gcc-5 branch and mainline), Ada
> bootstrap on Mac OS X 10.10.3 is broken:
> 
> cd rts; dsymutil libgnat-5.dylib
> Assertion failed: (linked_addr_pos != line_table_map.end()), function
> FixReferences, file
> /SourceCache/dwarf_utilities/dwarf_utilities-121/source/DWARFdSYM.cpp, line
> 3883.
> /bin/sh: line 1: 85928 Abort trap: 6           dsymutil libgnat-5.dylib
> make[3]: *** [gnatlib-shared-darwin] Error 134
> 
> This is dsymutil from dwarfutils-121.  I haven't yet checked if gcc's DWARF
> output
> changed in a way dsymutil cannot handle or dsymutil was upgraded (from Mac
> OS 10.10.2 to .3) adding some bogus check.

Even if dsymutil hasn't been upgraded, it might still be Apple's bug anyways...
Have you filed a radar for this yet?