[Bug ada/42518] Alignment issue prevents building 64 bit RTS on Snow Leopard

[howarth at nitro dot med dot uc dot edu]

------- Comment #9 from howarth at nitro dot med dot uc dot edu  2009-12-29 23:37 -------
(In reply to comment #8)
> --build=xxx means you're using a xxx compiler to build.  Since you apparently
> don't have a x86_64 compiler at hand but only a i386, you cannot do that.
> 
> You first need to build a i386 -> x86-64 cross-compiler (--host=i386-apple-*
> --target=x86_64-apple-*) with the base i386 compiler and then use the resulting
> compiler to build a native x86-64 compiler (--build=x86_64-apple-*).
> 

Again, it is important to actually check the code generation of the system
compiler. On a MacBook Pro
with an EMT64 compatible processor, I get...

gcc -v
Using built-in specs.
Target: i686-apple-darwin10
Configured with: /var/tmp/gcc/gcc-5646.1~2/src/configure --disable-checking
--enable-werror --prefix=/usr --mandir=/share/man
--enable-languages=c,objc,c++,obj-c++
--program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib
--build=i686-apple-darwin10 --with-gxx-include-dir=/include/c++/4.2.1
--program-prefix=i686-apple-darwin10- --host=x86_64-apple-darwin10
--target=i686-apple-darwin10
Thread model: posix
gcc version 4.2.1 (Apple Inc. build 5646) (dot 1)

even though this compiler default to x86_64 code generation on this hardware.
One of the oddities of a fat binary compiler in Snow Leopard. The reported
specs don't match the actual compiler code in use.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42518