[B2-devel] x86_64 Mach-O dyngen patch - Fixed

[Jean-Pierre <cho...@fr...>]

Hi,

Here's my latest dyngen patch for Snow Leopard x86_64 compatibility.
The previous version missed the local relocations for 16 bytes long  
constants, this is now fixed.
It has been tested and produces a correct source code extracted from  
the mach-o 64 bit object files built for SheepShaver, even though this  
code is a lot different from its Linux x86_64 counterpart..

I added a patch to the Darwin/lowmem utility to let it deal with 32- 
bit, 64-bit or fat architectures.

I also had to modify basic-dyngen-ops.cpp since apple's gcc adds a  
leading underscore to its symbols, i.e.:

#if defined __x86_64__
#define MOV_AD_REG(PARAM, REG) asm volatile ("movabsq $__op_" #PARAM ", 
%0" : "=r" (REG))
#else
...

becomes:

#if defined __x86_64__
#if defined(__MACH__)
#define MOV_AD_REG(PARAM, REG) asm volatile ("movabsq $___op_" #PARAM  
",%0" : "=r" (REG))
#else
#define MOV_AD_REG(PARAM, REG) asm volatile ("movabsq $__op_" #PARAM ", 
%0" : "=r" (REG))
#endif
#else
...

Here's how I built this version on MacOSX 10.6:

NO_CONFIGURE=1 ./autogen.sh
FLAGS="-arch x86_64 -isysroot /Developer/SDKs/MacOSX10.5.sdk -mmacosx- 
version-min=10.5"
CFLAGS="$FLAGS" CPPFLAGS="$FLAGS" LDFLAGS="$FLAGS" \
./configure --without-gtk --with-dgcc=g++-4.0
make

No more crash in Snow Leopard in 64-bit ! (:

Best regards,

- Jean-Pierre.