[cfe-dev] Compatibility with g++ and VS
dgregor at apple.com
Tue Jul 13 07:08:11 PDT 2010
Sent from my iPhone
On Jul 13, 2010, at 3:59 AM, "Martin C. Martin" <martin at martincmartin.com> wrote:
> We're not calling the Clang command line program, but rather hooking
> into parts of it to JIT compile some code. We'd like to pass data
> structures back and forth between the Clang compiled code and the
> ahead-of-time compiled code, which uses g++ on Linux and VS on Windows.
> So my question is: are classes laid out exactly the same in memory? If
> I give the same source to g++/VS and Clang, will the objects have the
> same fields in the same order with the same padding, same virtual
> function table, etc. ?
For g++, yes. For VC, we will probably get the same layout for C structs and POD classes, but we don't implement Microsoft's C++ ABI.
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