I'm trying to port a piece of code using LLVM as a library to the
latest SVN version.
One difference between 2.6 and 2.7svn is that `llvm-config --cxxflags`
now include -fno-rtti. Since my code does use RTTI information (in
non-trivial dynamic_cast), my code can't compile with this. Same goes
I've tried setting my CXXFLAGS to `llvm-config --cxxflags` -frtti
-fexceptions, now my code compiles, but it doesn't link against LLVM,
giving error messages like:
undefined reference to `typeinfo for llvm::TargetMachine'
undefined reference to `typeinfo for llvm::MCAsmInfo'
(for classes inherinting from the classes named by the error messages)
So, I have two questions:
* What's the rationale for including -fno-rtti in `llvm-config
--cxxflags`? Is this a bug? If not, it should be mentionned in the
release notes for 2.7.
* How can a user (like me) of the LLVM library derive from LLVM
classes and use rtti information?