Svadev mailing list

[John Criswell <criswell AT illinois.edu>]

On 6/8/12 6:20 PM, Matthew Wala wrote:
> Hi everyone:
>
> While trying to get Apache to compile on Presto I am running into an
> unusual error with clang on the below program which gets compiled by a
> configure script. Running 'clang -S -fmemsafety' never finishes so it
> looks it is going in an infinite loop.

How long did you wait to see if it finishes?

I'm seeing that, too, on Linux but not on Mac OS X.  Sadly, the problem 
doesn't appear to be with the SAFECode passes; if you use the -emit-llvm 
and -c options, clang will give you an instrumented bitcode file.

Using gdb and interrupting clang to see where it is in execution, it 
looks like it's getting stuck in the code generator somewhere.  If 
that's the case, we won't be able to fix the bug unless we either find 
and back-port the fix into the LLVM 3.0 branch, figure out what part of 
the SAFECode instrumentation is tickling the bug, or upgrade SAFECode to 
LLVM 3.1.

> John, I know you wanted me to try to compile Apache, but this issue is
> getting in the way. Can anyone else reproduce this?

Matt, can you do the following?

1) File a bug with the reduced test case as an attachment.
2) Try to compile Apache on Gravity; it's running a different version of 
Linux.  That might help.
3) If #2 fails, try to compile on Mac OS X.

-- John T.

> Matt
>
>
> #define _GNU_SOURCE
>
> #include<crypt.h>
>
> int
> main ()
> {
>
> struct crypt_data buffer;
> crypt_r("passwd", "hash",&buffer);
>
>    ;
>      return 0;
> }
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