So, what you are saying is that VS-2008 is not C99 standards compliant (what a surprise) but claims to be? Are you passing any C compiler flags that requests C99 compliance?

We have to use the flag /Qstd=c99. I guess it's more a Microsoft problem than anything.

To me, your proposed change seems a reasonable thing to do. What cases are you thinking of?

If someone is using any VS version > 2008, then _abs64 will be defined instead of llabs. I'm not sure if one is preferable to the other though.

I applied your change for now, it's in the 0.23.x. maintenance branch:

Thank you. Chris Hogan Scripting Tools Engineer Scripting, Analyzers and Tools Intel Corporation