[cfe-dev] LLVM/Clang Windows XP 32bit - MessageBox

[Peter Hanzel]

Hello.

I have downloaded CLANG 3.0 and successfuly build on Windows XP.
Now I tried to compile this simple MessageBox Win32 Api program:

#include <windows.h>

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR 
lpCmdLine, int nCmdShow) {
 MessageBox(NULL, "hello msgbox world\n", "Title", MB_OK);
 return 0;
}

I did it this way:

clang -c -emit-llvm main.c
llc -filetype obj main.o -o test.obj
link test.obj user32.lib msvcrt.lib

But when I run test.exe I get : The procedure entry point 
InterlockedCompareExchange64 could not be located in dynamic link library 
KERNEL32.dll.

So I dissassembled main.o and there is usage of: (attached to mail)

declare dllimport x86_stdcallcc i64 @InterlockedCompareExchange64(i64*, i64, 
i64)

But I think this is valid only for 64bit or Vista and more.
So I deleted whole stuff which is not needed to compile it.
Then with:

llvm-dis main.o
edit main.o.ll --remove 64bit stuff
llvm-as main.o.ll -o main.o
llc -filetype obj main.o -o test.obj
link test.obj user32.lib msvcrt.lib

And I got valid test.exe application, which also works.

So my question is: Is this Adding of unwanted stuff correct or is it some 
kind of bug?

Peter.

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