[Mesa-dev] RFC: LLVM, -fno-rtti, and Haiku

[Alexander von Gluck IV]

In llvm.py -fno-rtti is always a build flag if LLVM present >= 3.2

This breaks everything on our end (missing rtti related symbols) in our
C++ libGL.so as Haiku uses dynamic casts.

We build our LLVM packages with rtti (REQUIRES_RTTI=1).

Not 100% sure why we're forcing no-rtti if LLVM >= 3.2.
"llvm-config --cxxflags" should always show "-fno-rtti" if REQUIRES_RTTI=1
wasn't set at build time. If REQUIRES_RTTI was set, -fno-rtti is removed
from the llvm-config cxxflags.

It was originally added here:
http://cgit.freedesktop.org/mesa/mesa/commit/scons/llvm.py?id=d37ae642034bcaca39492c1eb75b029fb27ceffb

My solutions are either removing the forced -fno-rtti, or wrapping it
with a platform != 'Haiku'

Thoughts?

 -- Alex