[TriLUG] OT: cross compiling

[Joseph Mack NA3T]

On Tue, 9 May 2006, Ed Hill wrote:

> I haven't spent much time with cross-compilers but what you describe
> above doesn't seem necessary to me.  If I was trying to boot-strap a
> full compiler system onto a non-native platform then I would probably do
> it in multiple stages:
>
> - build a local cross-compiler
> - build a compiler using the cross-compiler and install it
>     in a non-/usr location on the remote machine

when you run `make install` for some packages, there seems 
to be a lot of compiling going on before the install runs. 
(I can't think of what right now, but I had one the other 
day that took forever to do `make install` after `make` had 
completed). For `make install`, I would have hoped that 
/bin/install would just copy everything over and set 
permissions. Because of the compiling that can take place on 
`make install`, I can't imagine tar| untar'ing my build tree 
and then running `make install` on the target machine. So I 
expect I have to run `make install` on the build machine and 
then copy everything over.

But I don't know, which is why I'm posting here.

> - using the non-/usr compiler on the remote machine, build a
>     full native compiler

the problem is that I don't have build access on the target 
machine (it's being used for other things and they don't 
want me building the gnu tools there). So I'm hoping to 
build all the native binaries of the gnu tools on my Linux 
box and then copy everything over.

> None of the above stages involve doing a "make install" on the local
> (starting) platform that overwrote any system things in /usr.  I just
> don't see why you would ever need (or even *want*) to do that -- its
> such a bad idea...

knowing that it's possible, I'll see if I can think how to 
do it.

> Also, there are many ways to deal with libraries including:
>
> - build executables with static linkage

I'm going to have to do that anyhow - the gnu ld for AIX 
doesn't understand shared libraries.

> - specify rpaths (see "man ld" for details)

better go look that up. I see "ignore rpath?" in configure 
and I've never known what it was about.

> - add dirs to ld.so.conf

don't have ld.so.conf on the target machine.

> - use the old stand-by: "export LD_LIBRARY_PATH=..."

I'm using that .

Thanks Joe


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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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