Am 11.07.2012 16:36, schrieb Konstantin:
Hello!
Free Pascal has been designed to run on several platforms on many
architectures which is a neat feature. The executable name is chosen
accordingly - ppc386, ppcx64 etc. to be able to have many at the same
time on the same system. When building from source it automatically
detects the platform on which it is running. Unfortunately, when
building on amd64 you end up with the ppcx64 compiler which can not
compile for x86 targets.
I'm using Free Pascal on Gentoo so I created ebuilds (see Gentoo bug
report here <https://bugs.gentoo.org/show_bug.cgi?id=322971>) to compile
FPC on amd64 machines for x86 as well if desired. Currently this
involves compiling everything twice and then install it together. This
way the advantage of the CPU to be able to run code in 32 bit and 64 bit
on the same system can be used.
So first question, is there a better way instead of compiling everything
twice? Maybe something can be reused?
I'm not used to Gentoo's ebuilds, so I'll tell you from FPC's normal
perspective:
if you do a "make all CPU_TARGET=i386" on a x86_64 Linux system then a
x86_64 -> i386 cross compiler will be created with default system Linux
and where the compiler binary will be called ppcross386 (instead of
ppc386). [It works similar on Windows, other targets and other CPUs with
the only exception that most non-i386 systems can not cross compile to
i386, because of the missing Extended support; x86_64 on non-Windows can
though] Only problem might be that the build process and/or the compiler
does not find the correct binutils, so you might need to help it using
BINUTILSPREFIX (e.g. "BINUTILSPREFIX=i686-linux-") and CROSSBINDIR (e.g.
"CROSSBINDIR=/opt/gcc32" {just an example}). The crosscompiled compiler
(and its units) is then installed using "make crossinstall
CPU_TARGET=i386 INSTALL_PREFIX=/whereever/you/want".
Regards,
Sven
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