[Dwarf-Discuss] dsymutil: "could not find referenced DIE" followed by a segmentation fault and other newbie questions

[Michael Eager]

On 12/08/2018 06:24 AM, Gil Moses via Dwarf-Discuss wrote:
> Hi,
> 
> Building with Xcode 7, once in a while I get the following warnings from the dsymutil tool (a few dozens):
> "could not find referenced DIE"
> Followed be a segmentation fault.
> 
> Adding the verbosity flag, I got detailed information about the DIEs that had the error, e.g.:
> ===========
> while processing /p4client/ProAudio/dev_main/ProAudio/XcodeBuildProducts/Debug/libWaveShell-Common.a(GraphicStream_Utils.o):
> warning: could not find referenced DIE
>      in DIE:
> 
> 0x0001415e:       DW_TAG_imported_declaration [99]
>                      DW_AT_decl_file [DW_FORM_data1]	("/Applications/Xcode7.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/sys/_types/_time_t.h")
>                      DW_AT_decl_line [DW_FORM_data2]	(20047)
>                      DW_AT_import [DW_FORM_ref4]	(cu + 0x4c4f5254 => {0x4c4f5254})
> ============
> 
> How do I go about understanding the error, what caused it and how to solve it?
> BTW, the lib size being built is around 350MB. Could there be a size issue causing this seg fault?
> 
> While I'm here, where could I download the full source code of dsymutil? All I found was links to separate files (https://opensource.apple.com/source/clang/clang-700.0.72/src/tools/dsymutil/)
> 
> Thanks,
> Gil Moses.

Hi Gil --

This is not really a question about DWARF.  This looks like a bug
in Clang.  You would get more help with this by sending your question to
the LLVM/Clang mailing list.

-- 
Michael Eager    eager at eagerm.com
1960 Park Blvd., Palo Alto, CA 94306