Re: About libdir for 64-bit

[Ralf Corsepius]

On 07/18/2013 10:07 AM, Thomas Jahns wrote:
> On 07/17/13 22:11, Russ Allbery wrote:
> > Probing sizeof(long) with the configure compiler does a fairly good job
> > for the most common cases, which is why that's what the macro I posted
> > does.  In particular, it works for the common cases of -m32 and -m64 on
> > hosts with both library paths.
>
> How does that distinguish x32 and i386? Or the n32 and o32 formats on IRIX?

No. When being used alone, it only distinguishes targets using 64 longs 
from targets using other sizes of long. Anything else is overinterpretation.

However, combining sizeof(long) with other cpp defines can be utilized 
to distinguish archs. In most cases this isn't necessary, because 
compilers usually provide specialized arch/ABI-specific internal defines 
which better suite such needs.

Unfortunately, I am not sufficiently familiar with the x32 archs and 
IRIX to be more specific.

Ralf