I'm trying to cross-compile on Ubuntu 9.10 x86_64 for i386. Here's what I've done so far:
I got FPC from the fixes_2_4 branch in SVN and did make/make install.
I used samplecfg to generate /etc/fpc/fpc.cfg.
I followed the wiki
(http://wiki.lazarus.freepascal.org/Cross_compiling#To_Linux) and did the steps listed there, including creating the i386-linux-ld and i386-linux-ls scripts in /usr/bin and compiling for the i386 target, so I ended up with a ppc386.
At this point I could do a simple "hello world" program which would generate a 64-bit binary if i selected x86_64 for the target in lazarus under "Compiler Options | Code" and a 32-bit binary if i selected i386 as the target. So far so good.
I then tried to compile something a bit more complicated (not that much more, though: I just tried to include "cthreads") and I got an error about crti.so not being found:
/usr/bin/ld: skipping incompatible /usr/lib/crti.o when searching for /usr/lib/crti.o
/usr/bin/ld: cannot find /usr/lib/crti.o
build.lpr(16,1) Error: Error while linking
As the Wiki is extremely vague as to what to do for fpc.cfg (Sorry, but "Edit your /etc/fpc.cfg file if needed" is not very useful), I did change this line:
#-Fl/lib;/usr/lib
to
-Fl/lib;/usr/lib;-Fl/lib32;/usr/lib32
However, to no avail. However, I did discover that /usr/lib32 doesn't even have crti.o, so a little more investigation made me realize I needed to install the "libc6-dev-i386" package, after which I did, in fact, have that file.
However, I'm still unable to compile a 32-bit executable that includes "cthreads" in its uses clause. ld still complains about not being able to find crti.o, despite my having added /usr/lib32 to the -Fl line of my fpc.cfg.
I do have this in my fpc.cfg:
==============================
# set binutils prefix
#IFNDEF CPUI386
#IFNDEF CPUAMD64
#DEFINE NEEDCROSSBINUTILS
#ENDIF
#ENDIF
#IFNDEF linux
#DEFINE NEEDCROSSBINUTILS
#ENDIF
#IFDEF FPC_CROSSCOMPILING
#IFDEF NEEDCROSSBINUTILS
-XP$fpctarget-
#ENDIF NEEDCROSSBINUTILS
#ENDIF
==============================
but I don't know if that's correct or whatever, that's just what samplecfg generated.
Observe:
compiling for 64-bit
==============================
$ /usr/local/bin/fpc -MObjFPC -Scgi -O1 -gl -vewnhi -l -Fu. -obuild build.lpr Hint: Start of reading config file /etc/fpc.cfg
Hint: End of reading config file /etc/fpc.cfg
Free Pascal Compiler version 2.3.1 [2009/11/02] for x86_64 Copyright (c) 1993-2009 by Florian Klaempfl
Target OS: Linux for x86-64
Compiling build.lpr
Linking build
ld here i am
ld.real: warning: link.res contains output sections; did you forget -T? 17 lines compiled, 0.2 sec
2 hint(s) issued
==============================
attempting to compile for 32-bit
==============================
$ /usr/local/bin/fpc -Pi386 -MObjFPC -Scgi -O1 -gl -vewnhi -l -Fu. -obuild build.lpr
Hint: Start of reading config file /etc/fpc.cfg
Hint: End of reading config file /etc/fpc.cfg
Free Pascal Compiler version 2.3.1 [2009/11/02] for i386 Copyright (c) 1993-2009 by Florian Klaempfl
Target OS: Linux for i386
Compiling build.lpr
Linking build
ld: warning: link.res contains output sections; did you forget -T? ld: skipping incompatible /usr/lib/crti.o when searching for /usr/lib/crti.o ld: cannot find /usr/lib/crti.o
build.lpr(16,1) Error: Error while linking
build.lpr(16,1) Fatal: There were 1 errors compiling module, stopping Fatal: Compilation aborted
Error: /usr/local/bin/ppc386 returned an error exitcode (normal if you did not specify a source file to be compiled)
==============================
I sort of think that /usr/bin/i386-linux-ld isn't being called. I added an "echo here I am" sort of line to that bash script, and I never see that echo happen.
I'm sure there's some magic I need to do in my fpc.cfg file, but I'm having a hard time finding specifically what it is. I'd really like to be able to compile for x86_64 and i386 in the same development environment simply by selecting a different target from the Lazarus UI and have it "just work."
If anyone can offer assistance, I'd surely appreciate it.
-SG