[cfe-dev] Using clang internals to preprocess a buffer, crashing with double free

[Csaba Raduly via cfe-dev]

On Fri, Feb 24, 2017 at 1:24 AM, Larry Gritz via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> Hi, helpful people. I'm trying to use clang internals to run an in-memory
> buffer through the C preprocessor (string to string), and I'm having
> trouble. I wonder if one of you kind souls might be able to spot the
> problem.
>
> I cobbled this code together looking at clang's BufferSourceTest.cpp unit
> test (for the aspect of how to read from a buffer), and for how to invoke
> just the preprocessor, I looked at the source code for ISPC (
> https://github.com/ispc/ispc/blob/master/module.cpp#L2453).
>
> The C++11 code below, linked against clang/llvm 3.9, works just fine if I
> compile my code with clang (any of 3.5, 3.9, 4.0) or with g++ 4.8.5. But
> when I build my code with g++ 4.9, 5.4, or 6.2, it seems to compile fine
> but will crash at runtime during the exit of this function, with the
> following error:
>
​
Try compiling with -fsanitize=address​

​Csaba​

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