[cfe-users] Syncing up clang and clang-tools-extra with llvm for git

[Michael Eisel via cfe-users]

Hi,

I'm hitting some segfault when I run dsymutil without any flags, but when I
add "-update", it works. I'm curious about this flag, but i can't find any
documentation. When it "updates", does that mean it needs an existing dSYM
file to begin with? And what are the actual pros and cons of using this
flag? FYI I'm trying to generate a dSYM for crash symbolication for an iOS
app.

Thanks,
Michael
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