llvm dev - Jun 2011 - [LLVMdev] Simple clang + llc crash on Windows 7

Hello,

I'm eager to get to know Clang+LLVM but I'm having some problems
generating debug information that force llc.exe to crash.

I'm running from the command-line on Windows 7 with clang+llvm versions 2.9
downloaded from the website. The input file is main.c:

     void mainCRTStartup()
     {
     }

This is compiled to intermediate with debug symbols using:

     clang -g -O0 -c main.c -emit-llvm -o main.bc

This runs fine and outputs main.bc - disassembly is here:
http://donw.org/main.bc.txt

I then try to comple that as an .obj file:

     llc -filetype=obj main.bc

And I get a crash with the error message:

     EmitRawText called on an MCStreamer that doesn't support it,  something
must not be fully mc'ized

I understand from the 2.9 release notes that filetype=obj is currently
experimentalbut the above is lifted from the visual studio intro on the website
with a couple of minor modifications.

Can I expect this to work? Am I doing something wrong?

Thanks!
- Don

On Fri, Jun 17, 2011 at 11:07 AM, Don Williamson
<don.williamson at yahoo.com> wrote:
> And I get a crash with the error message:
>
>      EmitRawText called on an MCStreamer that doesn't support it, 
something must not be fully mc'ized
>
> I understand from the 2.9 release notes that filetype=obj is currently
experimentalbut the above is lifted from the visual studio intro on the website
with a couple of minor modifications.
>
> Can I expect this to work? Am I doing something wrong?
There's a FIXME in AsmPrinter::EmitSectionOffset (in
lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp) pointing to this issue...
filetype=obj is still experimental, particularly for Windows.

-Eli

OK, thanks - that's a real shame.



----- Original Message -----
From: Eli Friedman <eli.friedman at gmail.com>
To: Don Williamson <don.williamson at yahoo.com>
Cc: "llvmdev at cs.uiuc.edu" <llvmdev at cs.uiuc.edu>
Sent: Friday, June 17, 2011 7:27 PM
Subject: Re: [LLVMdev] Simple clang + llc crash on Windows 7

On Fri, Jun 17, 2011 at 11:07 AM, Don Williamson
<don.williamson at yahoo.com> wrote:
> And I get a crash with the error message:
>
>      EmitRawText called on an MCStreamer that doesn't support it, 
something must not be fully mc'ized
>
> I understand from the 2.9 release notes that filetype=obj is currently
experimentalbut the above is lifted from the visual studio intro on the website
with a couple of minor modifications.
>
> Can I expect this to work? Am I doing something wrong?
There's a FIXME in AsmPrinter::EmitSectionOffset (in
lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp) pointing to this issue...
filetype=obj is still experimental, particularly for Windows.

-Eli