Cross-compile FPC on ppc64 for ppc64le
lazarus / 64-FPC development

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ferseiti · 2015-07-29 20:15

Hello. I have been trying to build fpc for target ppc64le but using a
ppc64 Fedora vm.

What I did so far was:
Create a script /usr/bin/powerpc64-linux-ld that runs
Code: [Select] ld -A elf64lppc $@ And create a
/usr/bin/powerpc64-linux-as that runs
Code: [Select]as -little $@
Then:
Code: [Select]make all  CROSSOPT="-Cb- -Caelfv2"
BINUTILSPREFIX=powerpc64-linux-
But the build fails with several errors just like this one:
Code: [Select]ld: powerpc64/units/powerpc64-linux/dbgstabs.o: compiled
for a little endian system and target is big endian
ld: failed to merge target specific data of file
powerpc64/units/powerpc64-linux/dbgstabs.o
pp.pas(238,36) Error: Error while linking
pp.pas(238,36) Fatal: There were 1 errors compiling module, stopping
Fatal: Compilation aborted
I am probably doing something wrong, of course. Any help will be
appreciated.
Thanks

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Jonas Maebe · 2015-07-29 20:25

As mentioned at http://bugs.freepascal.org/view.php?id=26261#c81964 ,
building a ppc64le installation on a big endian ppc64 is not possible
at this time using the top level Makefile, because we don't have
support yet for having multiple ABIs of a single platform in one
source tree (which you need when bootstrapping ppc64le on a ppc64
platform).

The easiest way to bootstrap is to cross-build on a non-ppc64 machine
instead (with the make invocation that you used), and then copy the
resulting bootstrap compiler (compiler/ppcppc64) to your ppc64le
system.

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ferseiti · 2015-07-29 20:32

That was a quick response
Yes, I saw that bug, but I didn't quite get it from there.
I will give it a try and post the outcome here.
Thank you!

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Jonas Maebe · 2015-07-29 20:48

Alternatively, if you really want to bootstrap on a big endian ppc64
machine:
build svn trunk for regular ppc64 using a plain make all (note that
you can speed up compilations on multicore machines by adding -j X
FPMAKEOPT="-T X", with X the number of cores)move compiler/ppcppc64 to
a temporary location (e.g. $HOME/bin/ppc64n)go into fpc/rtl/linux, and
execute make FPC=$HOME/bin/ppc64n OPT="-Cb- -Caelfv2 -O2 -a -st" clean
allthen go into fpc/compiler and execute the same therescp -r
fpc/rtl/units ppc64le-machine:fpc/rtl and then on ppc64le-machine in
fpc/units/powerpc64-linux execute for file in *.s; do as -o `basename
$file .s`.o $file; donescp -r fpc/compiler/powerpc64/units ppc64le-
machine:fpc/compiler/powerpc64/units ; scp ppas.sh link.res ppc64le-
machine:fpc/compileredit ppas.sh and link.res on the ppc64le machine
to adapt the paths to the various files (if necessary) and finally
execute ./ppas.sh in the compiler directory on the ppc64le machine.
The compiler binary will be called "pp"The above method is generally
what I use to bootstrap compilers for a new platform, so that I don't
need cross binutils.

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ferseiti · 2015-07-30 20:31

As a matter of fact, I also contacted Jaromír Cápík (reporter of
http://bugs.freepascal.org/view.php?id=26261).
He was able to generate a binary which he sent to me and I saved as
$HOME/fpc/bin/fpc
Then I ran:
Code: [Select]make compiler_cycle PP=$HOME/fpc/bin/fpc
cp ./compiler/ppcppc64 $HOME/fpc/bin/ppcppc64
make install PP=$HOME/fpc/bin/ppcppc64

I will try to bootstrap it anyway. Haven't tried yet.
Too bad it wasn't able to build v2.6.4 with the result (The version
available in Debian repository).

Code: [Select]/usr/local/bin/ppcppc64 -Ur -Ur -Xs -O2 -n -Fi../inc
-Fi../powerpc64 -Fi../unix -Fipowerpc64 -FE. -FU/root/fpc/fpc-
debian/fpc-2.6.4+dfsg/fpcsrc/rtl/units/powerpc64-linux @/root/fpc/fpc-
debian/fpc-2.6.4+dfsg/debian/deb-host-fpc.cfg -dpowerpc64 -dRELEASE
-Us -Sg system.pp
systemh.inc(508,3) Fatal: Cannot find system type "TEXTREC". Check if
you use the correct run time library.

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Jonas Maebe · 2015-07-30 21:15

It's never possible to build older versions of FPC with newer ones,
because the RTL and the compiler are quite tightly interwoven. And
even if the RTL would compile, it wouldn't help you at all since FPC
2.6.4 does not have any ppc64el support (so once the compiler itself
would be compiled, the resulting compiler would not be able to
generate ppc64el code).