llvm dev - Mar 2016 - Trunk: LLVM build is failing with a lot of `undefined reference` errors

> Try checking out libcxxabi as well.
It helped, thanks.

But I have another problem now. Regression tests don't pass:

http://paste.ubuntu.com/15406485/

Also I discovered that build process sometimes consumes about 10 Gb of
RAM. Luckily I have total 16 Gb of RAM. Still I had to close Google
Chrome and kill KVM guest systems to compile a project. I think its
just an insanity.

-- 
Best regards,
Aleksander Alekseev
http://eax.me/

Hi Aleksander,

By default the build type is Debug. It uses a lot of memory because object files
contain debug information. Each linking process consumes up to 4 GB of memory.
Ninja runs several linking processes at the same time.
If you want to build debug builds and work with them I recommend you to have 32
GB or more for comfortable work.
Solutions to memory problems:
1. Build a release version giving the following to cmake:
-DCMAKE_BUILD_TYPE=Release
    Other options for type are RelWithDebInfo and MinSizeRel. And of course
Debug.
2. Use gold instead of ld for linking.

The failed tests are MemorySanitizer tests. They were failing on Ubuntu 14.04
during preparation of 3.8.0 release. I don't know their current status.
I think you can ignore this if you are not going to use MemorySanitizer.

Kind regards,
Evgeny Astigeevich

-----Original Message-----
From: Aleksander Alekseev [mailto:afiskon at devzen.ru] 
Sent: 17 March 2016 06:11
To: llvm-dev
Cc: Evgeny Astigeevich
Subject: Re: [llvm-dev] Trunk: LLVM build is failing with a lot of `undefined
reference` errors
> Try checking out libcxxabi as well.
It helped, thanks.

But I have another problem now. Regression tests don't pass:

http://paste.ubuntu.com/15406485/

Also I discovered that build process sometimes consumes about 10 Gb of RAM.
Luckily I have total 16 Gb of RAM. Still I had to close Google Chrome and kill
KVM guest systems to compile a project. I think its just an insanity.

--
Best regards,
Aleksander Alekseev
http://eax.me/

Hello, Eugeny

Thanks for your answer.
> The failed tests are MemorySanitizer tests. They were failing on
> Ubuntu 14.04 during preparation of 3.8.0 release. I don't know their
> current status. I think you can ignore this if you are not going to
> use MemorySanitizer.
I discovered that same regression tests are broken not only in trunk
bat also in RELEASE_380/final (as you mentioned) and RELEASE_371/final.
You see, I wanted to test sanitizers from latests LLVM releases (which
are unavailable out of the box on Ubuntu 14.04) on our project. It is
the reason why I'm compiling LLVM from source in the first place.

Maybe you could recommend a relatively fresh LLVM release where all
sanitizers are still working?

-- 
Best regards,
Aleksander Alekseev
http://eax.me/