[LLVMdev] How to prevent insertion of memcpy()

[Chandler Carruth]

On Tue, May 29, 2012 at 9:52 AM, Dmitry Vyukov <dvyukov at google.com> wrote:

> On Tue, May 29, 2012 at 8:46 PM, Anton Korobeynikov <
> anton at korobeynikov.info> wrote:
>
>> > How do I disable that feature? I've tried -fno-builtin and/or
>> -ffreestanding
>> > with no success.
>> clang (as well as gcc) requires that freestanding environment provides
>> memcpy, memmove, memset and memcmp.
>>
>> PS: Consider emailing cfedev, not llvmdev.
>>
>
> Hi,
>
> Thanks. I've emailed cfe-dev.
> We absolutely need clang/llvm to not insert the calls into our code.
>

This really isn't possible.

The C++ standard essentially requires the compiler to insert calls to
memcpy for certain code patterns.

What do you really need here? Clearly you have some way of handling when
the user writes memcpy; what is different about Clang or LLVM inserting
memcpy?
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