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Compiled on Win64, using clang-cl.
Test code:

int __attribute__((sysv_abi)) my_sprintf_s(char *buffer, size_t sizeOfBuffer, const char *format, ...)
{
	va_list arg_list;
	va_start(arg_list, format);
	int ret = vsprintf_s(buffer, sizeOfBuffer, format, arg_list);
	va_end(arg_list);

	//__builtin_va_list v_list;
	//__builtin_va_start(v_list, format);
	//int ret = vsprintf_s(buffer, sizeOfBuffer, format, v_list);
	//__builtin_va_end(v_list);

	return ret;
}

Neither will compile, I get:
error : 'va_start' used in System V ABI function

How can I deal with this?

Hello!!!
I tried to compile my WinRT application(fully written on C++, not C++/CX) with "CLang 3.7 with Microsoft Codegen (v140_clang_3_7)", but could not. I use Visual Studio 2015 Update 2 with March 2016 CLang.
Errors:

1. C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\winrt\windows.foundation.collections.h(168,10): error : ISO C++ forbids forward references to 'enum' types
   enum CollectionsChange;
2. C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\winrt\Windows.Foundation.h(8831,26): error : ISO C++ forbids forward references to 'enum' types
   typedef enum PropertyType PropertyType;

Another issue produced when compiling template
`template
struct NOVTABLE RemoveIUnknown abstract : TInterface
{
static_assert(std::is_base_of<IUnknown, TInterface>::value, "TInterface must inherit IUnknown");

operator TInterface*() NOEXCEPT
{
    return this;
}

private:
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP_(ULONG) Release();
STDMETHODIMP QueryTInterface(IID, void **);
};`

variable has incomplete type 'struct RemoveIUnknown'
RemoveIUnknown abstract : TInterface

There were many others errors, but I think, that listed above are the most interesting.

I wonder what is the IR like in compiler front end before they lowering into X86 MPX Instructions

Hello,
How can I find a function name using a specific line of a file?
I have tried SourceLocation, from_position but it returns None!

There are important files that Microsoft projects should all have that are not present in this repository. A pull request has been opened to add the missing file(s). When the pr is merged this issue will be closed automatically.

Microsoft teams can learn more about this effort and share feedback within the open source guidance available internally.

Merge this pull request