[cfe-dev] exit() emits exception handling?

[Welson Sun via cfe-dev]

Hi,

I am trying to understand some LLVM IR Clang generates. Since I cannot
publish the source code, I can only describe what I see and my guess.

This is the main() function of some code, which allocates some memory and
sequentially calls a list of functions. There are no explicit exception
handling code in the source code, however, *for each function call*, the
LLVM IR for the function call becomes "invoke ... unwind ...". I am
wondering what causes the generation of such code. One thing I noticed in
the source code is the exit() call in main().

If I compile with -fno-exceptions, all function calls become normal "call",
without any "unwind" attribute.


Thanks
- Welson
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