[EMBnet ADMIN] 64 bit & irix

[David Martin]

OK, I'll try this.
I'll have to try to get 64 bit versions of the PNG libraries first.

..d


The admin guide will get updated in due course.

On Fri, 9 Feb 2001 jrvalverde at cnb.uam.es wrote:

> So, I finally had time to take a look at the configure script.
>
> It already contains a check for 64 bit irix compilation, and,
> when correctly used, generates the correct compilation scripts
> and makefiles. The problem is that it checks whether 64-bit is
> enabled _by default_, not whether it is available or has been
> user-selected.
>
> What ./configure does is create a trivial C file, compile it
> and check whether it is -o32, -n32 or -64, and then decide
> which compiler to use.
>
> Now, there is a simpler trick than the one I proposed: it all
> reduces to making the compiler/linker use the appropriate
> defaults _before_ running configure. For this:
>
> 	- remove gcc from your path
>
> 	- create a compiler.defaults file containing
>
> -DEFAULT:abi=64:isa=mips4:proc=r10k
>
> 	- define COMPILER_DEFAULTS_PATH
>
> setenv COMPILER_DEFAULTS_PATH `pwd`
>
> 	- run configure
>
> And that's it.
>
> Defining cc to be 'cc -64' and ld to be 'ld -64' and running
> configure dosn't work. In that case, the linker used is still
> the -n32 linker, and build fails with linking errors. You
> need to go the obscure trick way.
>
> One reason is configure hard codes the 'default' compilation
> method (which being default, it shouldn't need to) for the
> linker. Hence although if one aliases 'cc/gcc' to 64bit,
> it will still hardcode ld to be the default 'ld -32'. Should
> it just use "cc/gcc" and "ld" only, this wouldn't happen as
> defaults would be carried all along, this way the explicit
> flag overrides the aliases. So unless you get the explicit
> flags right by using the above trick, it won't work.
>
> BTW, this mess seems to happen (from what I gather looking at
> ./configure) only on IRIX. Makes sense, since that's probably
> the only system too that tries to maintain three incompatible
> binary systems defaulting compilation to 32 bits in 64 bit
> machines (sigh).
>
> On a side note: it won't work for gcc: the -64 test in configure
> is only used if the compiler is 'cc'. No check for --mabi=64
> seems to be present. For gcc I suspect one will need to run
> ./configure and then substitute all instances of 'gcc' by
> 'gcc --mabi=64' and of 'ld -n32' by 'ld -64'. Haven't tested
> though. Or configure as above with system cc and later alias
> cc to gcc --mabi=64.
>
> BTW, David, might you update the trick you added to the admin
> guide? Thanks.
>
> 				j
>
>
>
>

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