Re: [Tinycc-devel] TCC on OS X

[Thomas Preud'homme]

Le mercredi 15 septembre 2010 23:36:34, vous avez écrit :
> I meant to say that I wouldn't be able to try out your patch on OS X 10.6
> until next week, I can still test further things on OS X 10.5 here on my
> laptop as I have been today.
Oups, sorry, last request. Could you try tcc again with gdb and give me the 
complete stack trace? The following patch do the needed change to compile tcc 
with debug information and no optimisation. Then run tcc in gdb and get a 
backtrace with the 'bt' command.

I'm sorry to ask you all this but I have no mac os machine to test it myself..

Best regards,

Thomas Preud'homme
> 
> -A
> 
> ---
> Aaron Gough
> Software Developer
> 
> +1-647-746-7083
> www.thingsaaronmade.com
> 
> On Wed, Sep 15, 2010 at 5:26 PM, Aaron Gough <address@hidden> wrote:
> > Hey Thomas!
> > I tried re-applying your initial patch to a clean version of 0.9.25, then
> > disabling bound checking as you suggested. It builds but unfortunately
> > the resulting binary still segfaults immediately.
> > 
> > I also tried disabling just the malloc hooks, and that was the same.
> > 
> > Unfortunately I won't be able to try out your patch for configure until
> > next week as I am away from the office and my other development machine.
> > 
> > Thank-you for being willing to sink your time into helping fix a bug that
> > doesn't affect you! Very kind of you! I'm happy to continue running any
> > tests you need, getting this to work on OS X would be great!
> > 
> > - A
> > 
> > ---
> > Aaron Gough
> > Software Developer
> > 
> > 
> > +1-647-746-7083
> > www.thingsaaronmade.com
> > 
> > On Wed, Sep 15, 2010 at 4:38 PM, Thomas Preud'homme 
<address@hidden>wrote:
> >> Le mercredi 15 septembre 2010 21:24:57, Aaron Gough a écrit :
> >> > Hey Thomas!
> >> > Thanks for the patch! There were a couple of things that were still
> >> > breaking the build once the patch was applied, but I was able to fix
> >> 
> >> them.
> >> 
> >> > TCC now builds on OS X 10.5. Unfortunately the build segfaults (as
> >> > does 'make test'). Building it with -O0 and running through GDB gives
> >> > the
> >> 
> >> > following output:
> >> What do you mean by "the build segfaults"? Do you mean that the
> >> resulting tinycc binary segfaults?
> >> 
> >> > Program received signal EXC_BAD_ACCESS, Could not access memory.
> >> > Reason: 13 at address: 0x00000000
> >> > 0x8fe18c02 in __dyld_misaligned_stack_error ()
> >> > 
> >> > Hopefully this is something trivial, but I can't proceed any further
> >> > as I've really reached the limits of my very minimal experience with
> >> > C.
> >> > 
> >> > I have attached a patch for the changes that I used to get everything
> >> > to this point. Everything was done against a checkout of
> >> > release_0_9_25
> >> 
> >> that I
> >> 
> >> > got from the main repo.
> >> 
> >> Perfect. instead of patching bcheck.c try disabling bound check code. In
> >> tcc.h
> >> just add a #if 0 before line 97 and #endif after line 100 (in order to
> >> not define CONFIG_TCC_BCHECK).
> >> 
> >> > The biggest problem that I was unable to fix is that the malloc hooks
> >> > in bcheck.c have to work quite differently on OS X. I started porting
> >> > that section of code, but I was unable to get it to work. To get the
> >> > build to complete I added another conditional that means
> >> > 'install_malloc_hooks()' and 'restore_malloc_hooks()' do nothing on
> >> > OS X. Hopefully you'll be
> >> 
> >> able
> >> 
> >> > to correct these, I added some comments with links to the resources
> >> > that
> >> 
> >> I
> >> 
> >> > found regarding malloc hooks on OS X.
> >> 
> >> Thanks for the links, I'll read them later. Depending on the complexity
> >> on the
> >> differences I'd make a patch are let it to more experienced people. As
> >> to you
> >> patch, you can also just add the if defined(__APPLE__) statement at line
> >> 40
> >> (the line defining #undefining CONFIG_TCC_MALLOC_HOOKS and HAVE_MEMALIGN
> >> for non
> >> linux and non glibc environment). It would disable malloc hooks
> >> everywhere in
> >> the file.
> >> 
> >> So first try this, then if it still segfaults try disabling bound check
> >> (as
> >> said earlier) and tell me if even without bound check it segfaults.
> >> 
> >> > The uname specs for my system (OS X 10.5) are:
> >> > $ uname -m
> >> > i386
> >> > 
> >> > $ uname -s
> >> > Darwin
> >> > 
> >> > $ uname -a
> >> > Darwin aaron-goughs-macbook.local 9.8.0 Darwin Kernel Version 9.8.0:
> >> > Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386 i386
> >> 
> >> Ok I found the way to distinguish macos X 10.6 from 10.5
> >> 
> >> It seems Darwin Kernel Version 9.x is Mac OS X 10.5 whereas Darwin
> >> Kernel Version 10.x is Mac OS X 10.6
> >> 
> >> So with the attached patch, tcc configure should set configure properly
> >> on mac
> >> OS X 10.6 to compile in 64 bits. Please try to apply the patch,
> >> configure and
> >> make without modifying config.mak and config.h. Of course you'll need to
> >> use the
> >> patch from the previous mail and the modification I suggested for the
> >> malloc
> >> hooks.
> >> 
> >> > OS X 10.6 is a slightly different story. From what I understand 10.5
> >> > is
> >> 
> >> 32
> >> 
> >> > bit only. 10.6 is both 32 & 64 bit compatible. OS X uses a system
> >> > called 'universal binaries' to allow both 32 and 64 bit versions of
> >> > an
> >> 
> >> executable
> >> 
> >> > to be stored in the same file, as well as versions built for the older
> >> 
> >> PPC
> >> 
> >> > cpus.
> >> > 
> >> > I'm really not able to offer any further information on how the config
> >> > issue should be tackled for 10.6, though I was able to get a build
> >> 
> >> working
> >> 
> >> > on 10.6 with the following settings:
> >> That's all I needed. There is no Mac OS X 10.6 32 bits or 64 bits, there
> >> are
> >> all both.
> >> 
> >> > config.mak:
> >> > CFLAGS=-O2 -m32
> >> > ARCH=x86-64
> >> > 
> >> > config.h:
> >> > #define HOST_X86_64 1
> >> > 
> >> > The only things I changed was forcing the architecture to x86-64
> >> > instead
> >> 
> >> of
> >> 
> >> > i386 and forcing a 32bit build with -m32...
> >> > 
> >> > Hope this helps somewhat! Please let me know if there's anything else
> >> > I
> >> 
> >> can
> >> 
> >> > do!
> >> 
> >> Thanks again for all the interaction with me and for being kind enough
> >> to do
> >> all the test I asked you. Hope the patch I give you and the
> >> modifications I
> >> suggested will be enough for tcc to work both on 10.5 and 10.6
> >> 
> >> Best regards,
> >> 
> >> Thomas Preud'homme
> >> 
> >> > -A
> >> > 
> >> > ---
> >> > Aaron Gough
> >> > Web Developer
> >> > 
> >> > +1-647-746-7083
> >> > www.thingsaaronmade.com

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