Re: [Discuss-gnuradio] Compiler machine compatibility

[Marcus D. Leech]

On 04/08/2011 01:06 PM, Nick Foster wrote:
> Make sure you're compiling with optimization flags appropriate for the
> hardware you're planning to run on. For instance, if you spec -msse3 or
> newer on a pre-Prescott P4, you'll generate instructions the CPU can't
> execute. I'm pretty sure GCC won't generate these instructions unless
> you specify it using these flags so make sure your automake/cmake setup
> isn't doing so.
>
> Another issue is if you compile on a 32-bit compiler it'll barf on a
> 64-bit system, and this might generate an illegal instruction error.
> This is the reason package maintainers keep a 32-bit and 64-bit version
> of their packages. If you want to make code that runs on a 64-bit system
> from your 32-bit system, you'll have to use a 64-bit GCC installation (I
> think GCC is the same for either, but you need 64-bit libc) and use -m64
> as a compile flag.
>
> --n
OK, so it turns out that I lied, viciously and nastily. Brazenly, even :-)

I had -msse3 turned on, which won't work on an early Pentium 4, but will 
work on late-model Pentium 4.

So, I cranked-back the optimization flags to -msse2, which was available 
for Pentium 4.


--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org