Re: [xmlvm-users] Boehmgc and iphone

[Bruce J. <bru...@go...>]

Hi Paul

Actually, that's the problem: if you want to build the posix target
for iPhone, then you need to cross compile the GC library. Following
the instructions below doesn't work, this will build a library for the
host system and not the target system.

This is further compounded by the change Apple has made to its
compilers (llvm over gcc) and the location that is used to store them
with XCode 4.3+.

Having spent some time on this, I have now got it working, which may
be useful for others:

Arno asked this question on the boehmgc mail list last year, as you
can see here:

http://article.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/4613/match=ios

I wasn't sure about Ivan's reply, but it turns out he was almost
correct. If you:

cvs -d:pserver:ano...@bd...:/cvsroot/bdwgc co bdwgc
cd bdwgc
gcc -I include -I libatomic_ops/src -arch armv6 -O2 -c -isysroot
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
-s -DALL_INTERIOR_POINTERS -DGC_THREADS -DTHREAD_LOCAL_ALLOC
-DPARALLEL_MARK -DUSE_MMAP -DUSE_MUNMAP -DNO_DYLD_BIND_FULLY_IMAGE
tests/test.c extra/gc.c

…you'll actually build the garbage collector (the output file gc.o is
all you need) which you can then link against the output from an XMLVM
posix project for iPhone.

Best regards

Bruce

On Tue, May 22, 2012 at 11:38 PM, Paul Poley <bay...@gm...> wrote:
> In xmlvm/var/posix/Makefile, you can find the instructions at the top.  Here
> is the comment:
>
> # This Makefile relies on an installation of the Boehm Garbage Collector
> # for the target platform. The Boehm GC can be downloaded, configured and
> # installed as follows:
> #
> # cvs -d:pserver:ano...@bd...:/cvsroot/bdwgc co bdwgc
> # cd bdwgc
> # ./configure --enable-threads=posix --enable-thread-local-alloc
> --enable-parallel-mark
> # make
> # make install
>
> I have done this as well to run posix targets.
>
> Thanks,
> Paul
>
>
> On Tue, May 22, 2012 at 1:21 PM, Bruce Jackson <bru...@go...>
> wrote:
>>
>> Hi All
>>
>> I'm trying to compile the boehmgc for use with XMLVM posix target to
>> produce a library I can use on iPhone.
>> I've seen much discussion on this subject:
>>
>>
>> http://article.gmane.org/gmane.comp.programming.garbage-collection.boehmgc/4560/match=iphone
>>
>> …and a question by Arno about the options used to ./configure, but this
>> still seems to be something that isn't obvious/possible at all.
>>
>> Does anyone know: is it possible to build the gc using the ./configure
>> tools, and if so, what are the options used? If not, how have people gone
>> about building it?
>>
>> Thanks
>>
>> Bruce
>>
>>
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