[LLVMdev] RTTI handling (original) (raw)

Marshall Clow mclow.lists at gmail.com
Fri Sep 30 10:30:03 PDT 2011

On Sep 30, 2011, at 10:16 AM, Garrison Venn wrote:

On Sep 30, 2011, at 12:15, Somorjai, Akos wrote:

Hello all,

I was wondering how llvm and clang handles the RTTI shared libraries issue mentioned here: http://gcc.gnu.org/faq.html#dso Is it using name or address comparison? We have an architecture with several frameworks and plug-ins; some of the latter are being loaded and unloaded runtime. _In the past that issue caused crashes in our app, so at the moment we are overriding dynamiccast to detect this problem, but that's kind of messy. I'm hoping for a better solution with llvm… (Mac OS X 10.6/10.7, clang 3.0) LLVM does not use RTTI--it has its own mechanisms; see llvm/include/llvm/Support/Casting.h, and by default it is turning off for an LLVM build.

I don't think that's what the OP meant.

I think he's talking about using RTTI in his code - how LLVM generated code (and/or LLVM runtime libraries) handle RTTI. I expect the answer is "The same as gcc, since code compiled with LLVM needs to interoperate with code compiled with gcc.

[ I too would like a better way of handling RTTI and dynamic libraries ]

-- Marshall

Marshall Clow Idio Software <mailto:mclow.lists at gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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