This is my first attempt at cross compiling and I'm a little
unclear as to how it works. I'm following the recipe at
slacy.com, cross compiling on Linux for the target cpu =
Atmel AVR (the real target is IBM AIX).
The first step is to produce the binutils. To prevent
namespace collisions, the output binaries are given the
prefix "avr-", so I get avr-ar, avr-nm etc in /usr/bin after
make install on my linux box.
The only collision is a new /usr/lib/libiberty.a which
overwrites my current libiberty.a - it has a different size
than the one I produced in a parallel run with the target
set to i686-pc-linux-gnu.
Is this libiberty.a OK to leave in /usr/lib/? According to
`file`, it's a regular LSB 80386 executable.
I had asssumed that the avr-ar, avr-nm I was producing were
for the target AVR CPU, but according to `file`, they're
also regular linux binaries. They fire up quite happily on
my linux box from the command prompt.
If I've done this right, then presumably avr-ar etc are used
to make the cross compiler (the next step) and not to be
copied to the target machine?
Presumably the next stage, I produce the cross compiler
which will have a name like avr-gcc and will live in
/usr/bin/. To produce the native ar for the target box, I
would use /usr/bin/avr-gcc to compile binutils with the
target being "avr"? Assuming I have the native ar, how do I
handle the `make install`? I can't use --prefix=/usr or it
will clobber my linux files. If I use --prefix=/usr/avr,
this will clobber my cross compile executables. Where should
I install to on my linux box (/usr/avr-native/ ?). Assuming
I can compile these native executables, and I tar| untar
them to the target box, say under /usr/gnu, will the native
ar, nm etc expect to be in the original install directory
(say /usr/avr-native) and looking for files/libs there
rather than under /usr/gnu?
Thanks Joe
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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
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Homepage http://www.austintek.com/ It's GNU/Linux!
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