[cfe-dev] Windows .exe from clang + COFF w/o gcc - success with issues

[per at lumai.se]

Ping? Does anyone feel like taking a look at these patches? Should I 
submit any bugs for the issues below?

-- 
Per Lindén

per at lumai.se skrev 2010-08-11 18:11:
> Hi all,
>
> I have been experimenting with the creation of Win32 executables using
> only MSVC SDK headers, clang, llc and link.exe from MS Visual Studio
> 2008. This has uncovered a few issues:
>
> 1) VisualStudioWindowsX86_32TargetInfo needs to define
> _STDCALL_SUPPORTED. Otherwise the Win32 API does not get dllimport
> declarations and linking fails. Patch attached.
>
> 2) The SDK include directory search fails for me.
> InitHeaderSearch.cpp:getWindowsSDKDir() uses key "InstallationFolder"
> whose contents lacks the final "\include" needed for SDK 6.0a.
>
> 3) Compiling the simple test program below causes the resulting llvm
> assembly to include definitions of the functions Int64ShllMod32,
> Int64ShraMod32 and Int64ShrlMod32 although these are neither used or
> referenced in the code. This in turn causes problems in 4):
>
> define x86_stdcallcc i64 @Int64ShllMod32(i64 %Value, i32 %ShiftCount)
> nounwind inlinehint {
> entry:
> %retval = alloca i64, align 8 ; <i64*> [#uses=1]
> %Value.addr = alloca i64, align 8 ; <i64*> [#uses=1]
> %ShiftCount.addr = alloca i32, align 4 ; <i32*> [#uses=1]
> store i64 %Value, i64* %Value.addr
> store i32 %ShiftCount, i32* %ShiftCount.addr
> call void asm sideeffect "FIXME: not done",
> "~{dirflag},~{fpsr},~{flags}"() nounwind, !srcloc !0
> %0 = load i64* %retval ; <i64> [#uses=1]
> ret i64 %0
> }
>
> 4) Parser::FuzzyParseMicrosoftAsmStatement() emits "FIXME: not done" in
> the llvm code above when microsoft assembly is encountered. Changing it
> to emit "/*"FIXME: not done*/" makes the resulting file compile. Patch
> attached.
>
> ***
>
> The final Win32 executable works when fixes for the stuff above are
> applied...! I personally find this very cool. Steps to reproduce:
>
> Create test.c:
>
> #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;
> }
>
> Run (in the "Visual Studio 2008 Command Prompt" or another working MSVC
> environment):
>
> clang -I <path to SDK/include> -D_STDCALL_SUPPORTED -c -emit-llvm test.c
> llc -filetype obj test.o -o test.obj
> link test.obj user32.lib msvcrt.lib
>
> link.exe = the MSVC linker