Bug#728710: [Jack-Devel] Bug#728710: jackd2: Bus error w/ POST_PACKED_STRUCTURE on powerpc G4 32bit

[Benoît Delcour]

I will recompile jack this weekend to see if I can work that out.

Here are the defines of gcc:

gcc -dM -E - < /dev/null |grep "ppc\|PPC\|powerpc"
#define _ARCH_PPC 1
#define __PPC__ 1
#define __powerpc__ 1
#define __PPC 1
#define __powerpc 1
#define PPC 1
#define powerpc 1

Can we assume that __powerpc__ is 32 bit only?

On Fri, 21 Mar 2014 12:35:12 +0100
Robin Gareus <robin at gareus.org> wrote:

> On 03/21/2014 11:25 AM, Adrian Knoth wrote:
> > On 11/04/13 15:49, Benoît Delcour wrote:
> > 
> > Hi!
> > 
> >> I just got myself a dual Powermac G4 out of a garbage bin,
> >> and immediately installed debian and jackd2.
> >> It fails with an obscure "Bus error"; since I also own a raspberry pi,
> >> I first tried to patch source with the same fix, and it works.
> >> See "Usage of __attribute__((__packed__)) causes bus error on ARM":
> > 
> > OK, got you.
> > 
> >> Modifiying source to #undef & #define it unconditionnally did the trick.
> >> Bug report tagged as patch, but I don't know the correct flag.
> >> I can prepare an actual patch if/when I get the __powerpc__ 32bit-only
> >> thingy
> > 
> > Did you ever find the correct macro? We're close to a new jackd release
> > and would include this fix, if necessary (and correct).
> 
> gcc -dM -E - < /dev/null
> 
> lists all compiler defines, I hazard a guess that __ppc__ is appropriate
> (there's also __ppc64__).
> 
> But going by compiler defines alone is tricky (OSX for example allows
> multi-arch builds, even though osx <= 10.5 PPC users are rare these
> days). This should be really be set/auto-detected during waf configure.
> 
> 2c,
> robin


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