[llvm-dev] Crash in SmallVector with latest MSVC 2019 (debug mode)

Reid Kleckner via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 22 11:15:54 PST 2020

I don't think there is anymore upstream LLVM testing for 32-bit MSVC. I'll
run a local build in this configuration and look into it. I'll use this
compiler version:
Microsoft (R) C/C++ Optimizing Compiler Version 19.24.28315 for x86

We had so many issues in clang-cl around calling conventions for "small"
objects with interior pointers, I wouldn't be surprised if there are bugs.

On Wed, Jan 22, 2020 at 10:01 AM Francois Pichet via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Is anybody using the LLVM/clang/lldb compiled with the MSVC 2019
> (x86-32bit) successfully?
> I am getting crash in SmallVector at multiple places after a
> llvm:SmallVector is being moved around in move constructor or move
> operator=.
>  Not sure what is going on.
>   ~SmallVectorImpl() {
>     if (!this->isSmall())
>       free(this->begin());  // <=== crash here, line 336 SmallVector.h
>   }
> The crash occurs only with clang compile in debug mode. Release mode is
> fine.
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