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[Gcl-devel] Re: Patch for gcl-2.6.7 on MacOSX(10.4.2) to build maxima-5.

From: Aurelien Chanudet
Subject: [Gcl-devel] Re: Patch for gcl-2.6.7 on MacOSX(10.4.2) to build maxima-5.9.[12] and so on.
Date: Fri, 2 Dec 2005 08:23:04 +0100

> 1) revert void *my_sbrk to char *my_sbrk.  Can we use a name which
>    does not conflict with any system routine?

I suspect this is becausse /usr/include/unistd.h has changed between
Mac OS X 10.2 (which I think you have at utexas) and 10.4 which I
have. I'd suggest something like :

#if defined(flag identifyin Mac OS X 10.4)
void *my_sbrk();
char *my_sbrk();

If you're happy with that, I can commit something like that.

> 2) Add _setjmp(env) to plttest.c to get both _setjmp and __setjmp
>    symbols.  I suspect there is a macosx version dependency to the
>    name mangling issue we need to work out.(not committed)

Do you mean that the following call would work ?

void foo () { }

int main ()
  (void) (*p) () = _foo;
  (*p) ();

> 3) No root nor tcl/tk on the machine in question, so I cannot
>    reproduce this issue, but I don't see where my_free and my_malloc
>    appear in o/alloc.c????  Am I missing something dumb?

To the best of my understanding, the default behavior for gcl on Linux
is to override libc's default malloc/free routines. This is something
that cannot be done easily on Mac OS X (see README.macosx) : we simply
cannot override the system's default malloc. On Mac OS X, malloc
defaults to calling a low level memory allocation routine. For most
applications, the user doesn't have to care about this low level
memory allocation routine : the system provides a default allocation
routine transparently. However, in gcl, we provide our ow low level
memory allocation routine which is simply a wrapper around malloc
defined in o/alloc.c. Therefore, what we in h/powerpc-macosx.h do is :

#undef malloc
#define malloc my_malloc

typical call the system's default malloc -> call to our low level
memory management routine (defined in o/unexmacosx.c) -> call to gcl's
custom memory allocation routine (defined in o/alloc.c) whose named is
changed from malloc to my_malloc

Therefore, we have a symbol called my_malloc in o/alloc.c (try nm |
grep my_malloc on o/alloc.o).

> Will look at axiom, acl2, and cvs head next.  May I request:
> 1) That we elide the diagnostic material output on save system?  This
>    might alarm the typical user.  BTW, have confirmed that the old
>    save-system bug we were chasing in 2.6.6 is gone, or at least
>    intermittent :-).

OK, I'll do something like :
#define VERBOSE

> 2) That we see about scaling the heap size from configure like on
>    other platforms?

Do you mean : is the regular scheme used to scale the heap size on
other platforms likely to work on Mac OS X ? I bet so.


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