Aram Havarneanu wrote:
Hello, I want to build a PDP-11 cross compiler. Actually I want 2 compilers:
1) A compiler that produces executable images that can run on 2.11BSD.
Your target name would be for instance 'pdp11-bsd2.11'...
2) A compiler that produces PDP-11 code that I can load in the memory
and execute directly without an Operating System loaded (obviously, I
wouldn't have a libc to link my programs).
Your target name would be for instance 'pdp11-aout'
Obviously the target for the compiler is pdp11, but I can't figure out
what ABIs do I need to use. Any hints?
ABIs? You would need the prebuilt 'Standard C library' for
PDP11/2.11BSD for the $target #1,
just as producing the GNU binutils for the same $target. Getting the C
library seems to be somehow
"complicated", basically one "installs" the 2.11BSD system somewhere
like the SIMH simulator:
http://vak.ru/doku.php/proj/pdp11/211bsd
and after that copies the headers and libraries from the installed
system onto one's cross-host...
For "just for a fun" crosstoolchain builders the bare headers & libs in
a tarball would be much
better...
Binutils would be required for the $target #2 too, and maybe the newlib
headers unless you use the
'--without-headers' in GCC configure...
So the builds would be quite plain vanilla ones.
