[PD] fat binaries or not, on OSX (was: 'Pd 64 bits' for OSX is i386 + ppc)

[katja]

On Tue, Dec 15, 2015 at 9:56 AM, IOhannes m zmoelnig <zmoelnig at iem.at> wrote:
> On 2015-12-13 23:16, katja wrote:
>> iven to both compiler and linker:
>>
>>     -arch i386 -arch x86_64 -mmacosx-version-min=10.5
>>
>> One thing I noticed when building fat binaries: gcc doesn't define
>> __i386__ or __x86_64__ which we use to conditionally compile bithacks.
>
> ?are you sure?
>
> $ cc --version
> i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
> $ cat > testarch.c <<EOL
> #include <stdio.h>
> int main() {
> #ifdef __i386__
>   printf("i386\n");
> #endif
> #ifdef __x86_64__
>   printf("x86_64\n");
> #endif
>   return 0;
> }
> EOL
> $ make testarch CFLAGS="-arch i386 -arch x86_64 -mmacosx-version-min=10.5"
> $ ./testarch
> x86_64
> $ arch -i386 ./testarch
> i386
> $ arch -x86_64 ./testarch
> x86_64
> $

This looks good, thanks for proving me wrong. Which OSX version is
this? I've had troubles with denormals in fat binaries in the past
(OSX 10.5). It turned out that the preprocessor didn't pass
architecture defines when preprocessing for multiple architectures.
The behavior has apparently changed with compiler version. I'll look
into this matter again.

>
>> For this reason I'm now thinking that single-architecture should be
>> the default in a generic build system, and fat binary an option.
>
> dunno.
> i think that the default should be to just use the system-defaults
> (don't tell the compiler which architecture it should build for).
> this is driven by the experience with tehe template/Makefile: there are
> a number of externals out there that don't build on recent OSX, because
> the original template-Makefile would build for PowerPC and apple dropped
> out-of-the-box support for ppc.
>
> otoh. it's obviously of utmost importance that any thus-compiled
> external loads correctly under a "default" Pd installation.
>
> so for practical reasons it's probably best to use i386/x86_64 (and
> don't enable PPC by default)

On 'recent' OSX (>= 10.6) Makefile.pdlibbuilder builds i386 / x86_64
by default, no ppc. For OSX 10.5 the default includes ppc which was
still supported at that time. OSX 10.5 can build the fattest binaries
out of the box. But I didn't include ppc 64 bit (yet) as I've never
had an opportunity to test that.

>
> fgmadr
> IOhannes
>
>
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