Confirmed that it happened in this build: https://build.chromium.org/p/chromium.fyi/builders/Libfuzzer%20Upload%20Mac%20ASan/builds/5496

I'm not the right person to own this, though. But thakis@ just went on vacation for two weeks...

Actually the most recent error looks more like an rtti thing in icu...jshin touched that recently. I'd be surprised if this is due to the roll.

But yeah, I'm out until the 21. Ccing a few folks.

I may suggest to revert jshin@'s roll of ICU (https://codereview.chromium.org/2229733004), but I don't see anything in those 3 CLs (https://chromium.googlesource.com/chromium/deps/icu.git/+log/ef5c7353..53ce6316) which could affect this.

I'm looking more into this.

Ah, yes, it happened exactly after clang roll and earlier than ICU roll.

Not sure if it's worth for me to try to fix it, or jshin@ can fix it faster?

Anyway, I'm checking out the repo on my macbook air in the background.

The linking issue happens due to usage of typeid operator. Do we use an out-of-date version of libc++ for Mac OS X?

Adding of "//buildtools/third_party/libc++abi" to deps of component("icuuc") resolved problem for me.

Sadly, src/third_party/icu/BUILD.gn file is stored in icu.git repo, so I probably cannot simply add that dependency from chromium repo. jshin@, what would be the best solution here?

Jshin@, can you please fix as per c#10, c#11. This is causing compile failures on mac libfuzzer.

> src/third_party/icu/BUILD.gn file is stored in icu.git repo, so I probably cannot 
> simply add that dependency from chromium repo. jshin@, what would be the best
> solution here?

Am I right that eventually something should be done on the clang side? I have little idea what ICU can do about it other than what you tried? 

BTW, I can't send a tryjob to a failing builder. (a speculative CL is at https://codereview.chromium.org/2247953005  - based on your comment 10 + my guess). 

$ git cl try -b 'Libfuzzer Upload Mac ASan' 
ERROR: Access denied: User user:jshin@chromium.org cannot add builds to bucket master.chromium.fyi

+1, I believe that something on the clang side should be done. I wonder, if anybody else has the same issue after the roll.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/deps/icu.git/+/2341038bf72869a5683a893a2b319a48ffec7f62

commit 2341038bf72869a5683a893a2b319a48ffec7f62
Author: Jungshik Shin <jshin@chromium.org>
Date: Wed Aug 17 16:34:56 2016

Fix fuzzer build on Mac for ICU

Make icu depend on //buildtools/third_party/libc++abi
on mac for sanitizer builds.

BUG= 636127 
TEST=Libfuzzer Upload Mac ASan builds
R=mmoroz@chromium.org

Review URL: https://codereview.chromium.org/2247953005 .

[modify] https://crrev.com/2341038bf72869a5683a893a2b319a48ffec7f62/BUILD.gn

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/95efca8c457bdf81e36229fe252edef2b26daf52

commit 95efca8c457bdf81e36229fe252edef2b26daf52
Author: jshin <jshin@chromium.org>
Date: Wed Aug 17 18:47:27 2016

Roll ICU to  2341038b

Fix libfuzz builds on Mac.

There's only one change in this roll.
https://chromium.googlesource.com/chromium/deps/icu/+/2341038b

BUG= 636127 
TEST=Libfuzzer Upload Mac ASan builds
TBR=mmoroz@chromium.org

Review-Url: https://codereview.chromium.org/2254543005
Cr-Commit-Position: refs/heads/master@{#412598}

[modify] https://crrev.com/95efca8c457bdf81e36229fe252edef2b26daf52/DEPS

The build is green (https://build.chromium.org/p/chromium.fyi/builders/Libfuzzer%20Upload%20Mac%20ASan?numbuilds=200), thanks!