[swift-dev] Stack dump of the compiler?

[rintaro ishizaki]

Hi all,
I've noticed recent build of swift compiler doesn't show the stack dump on
crash.

Here is the result with October 25, 2016 snapshot.
https://gist.github.com/rintaro/cb694898821fbbe8b02734862eb69534

On macOS, the dump completely doesn't show up.
On Linux, the dump shows up, but without symbols.

As for Linux, I figured out that it's because of recent change in
CMakeList.txt
cmake_minimum_required(VERSION 3.4.3)
Specifically, the policy change of CMP0065
https://cmake.org/cmake/help/v3.4/policy/CMP0065.html
backtrace_symbols_fd() needs symbols exported.

As for macOS, I'm not sure why.

I don't know what is the right way to fix this.
cmake_policy(SET CMP0065 OLD)
would fix the Linux build but ...

Any thought?
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