Re: [xmlvm-users] Boehmgc and iphone

[Arno P. <ar...@pu...>]

Bruce: I'm not sure what you mean with "cross compiling the GC library". 
The GC is written in C with a lot of platform-specific code. The 
configure script is used to adapt the GC to a specific platform. The 
purpose of the mail I posted on the Boehm GC was to determine the 
correct configure options for iOS.

When using --target=iphonec, XMLVM will copy a pre-configured GC that is 
bundled with XMLVM. When using --target=posix it is expected that the 
target platform has an installation of the Boehm GC. That is why I 
included the instructions in the Makefile. Please note that Boehm GC has 
moved to GitHub and you should get the latest version from there:
http://www.hpl.hp.com/personal/Hans_Boehm/gc/

Arno


On 5/23/12 2:05 AM, Bruce Jackson wrote:
> 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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