[fpc-devel] OpenBSD compiler

[Marco van de Voort]

In our previous episode, Pierre Free Pascal said:
> I tried to get i386-openbsd port up to date,

I had a openbsd 4.8 VM lying around, so I tried my usual cross bootstrap
routine (I'm lazy, you don't need crossbinutils on BSD systems since they
can run the linux bootstrap compiler)

What I did (preparation):

0. checked out the repo on the openbsd VM
1. compiled a linux compiler on linux with -dCMEM, this so that the binary
has a decent ELF "ident" section
2. Copy it over to the openbsd VM. chmod +x
3. ran 
   sysctl kern.emul.linux=1
   as root to enable linux emulation
4. ran "pkg_add fedora_base" to install basic userland
5. ran "pkg_add gmake" to install GNU make
6. modified rtl/openbsd/makefile to also compile cmem
7. ran 
    gmake PP=~/linux-bootstrap-with-cmem-ppc386 OS_TARGET=openbsd
    BINUTILSPREFIX="" OPT=-gl 
   in rtl/openbsd to build rtl

First I tried to build the compiler straight:

gmake all PP=~/linux-bootstrap-with-cmem-ppc386 OS_TARGET=openbsd
RTL=/fpc/fpc/rtl/units/i386-openbsd OPT="-gl" BINUTILSPREFIX=""

this yields a compiler that gives an exception in readdir (if I try to
compile) or options.readparameters with no parameters.

If I run with -i or -h, the usual output appears with a crash in
SYSTEM_REMOVE_FIXED_CHUNKS following it, which I assume is a heapmanager
function calling munmap?

I then tried to build with CMEM (same line as above but with -dCMEM added to
OPT) to work around potential memory allocation problems, but that didn't
link on a bunch of operating_system_* missing symbols (envp/argv/argc), so I
assume its startup code wasn't fixed.