[cfe-dev] Enormous memory usage of clang

[Rafael Espíndola]

> Please try clang++ -c -O2 -g botan.ii (previous revision of clang leaked memory without -g too, but it doesn't reproduce on latest trunk)
>
> I'm using clang trunk (r159913), linux x86-64, built with clang++ -O2

I get:

-O2 -g -c: about 1gb
-O2 -g -S: about 900 mb
-O3 -g -c -emit-llvm: about 800 mb

So this looks like a different bug from what you found originally, it
is "just" that our debug representation is very not very memory
efficient, but gcc 4.7 peaks at about 850 mb, so we are not that bad.

Cheers,
Rafael