In microsoft, support __fastcall on functions without prototype

[nico]

Bugzilla Link	12708
Resolution	WONTFIX
Resolved on	Jul 26, 2014 14:11
Version	unspecified
OS	Windows NT
Blocks	llvm/llvm-bugzilla-archive#13707
CC	@asl,@zmodem,@tritao

Extended Description

handleFunctionTypeAttr in SemaType.cpp

C:\src\chrome\src>type test.c
void __fastcall f() {
}

C:\src\chrome\src>cl /c test.c
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 16.00.30319.01 for 80x86
Copyright (C) Microsoft Corporation. All rights reserved.

test.c

C:\src\chrome\src>....\llvm-build\bin\Release\clang.exe -c test.c
test.c:1:6: error: function with no prototype cannot use fastcall calling convention
void __fastcall f() {
^
1 error generated.

This is used in lzma_sdk if _MSC_VER is defined.

[tritao]

Can't reproduce this on trunk. Is it fixed?

[nico]

I still see this with today's trunk (r159059). It only happens for .c files, not .cc.

[tritao]

Ah you are right. I didn't notice it only happens on .c files.

[nico]

See comment 2 on issue 20386 for why this isn't a good idea.

[tritao]

mentioned in issue llvm/llvm-bugzilla-archive#13707