Why is one compiler on 10.6 able to generate PPC binaries and not the other?

[Ryan Schmidt]

> On Mar 10, 2016, at 1:00 PM, Mojca Miklavec <mojca at macports.org> wrote:
> 
> Hi,
> 
> While following
>    https://trac.macports.org/wiki/LibcxxOnOlderSystems#Leopardppc
> on 10.6/x86_64 I tried to install clang 3.7 (thinking that version 3.7
> might have an even better support for PPC than 3.6).
> 
> The problem is that clang-mp-3.7 doesn't want to produce ppc binaries,
> so I wasn't able to install libcxx. I get:
> 
>> clang++-mp-3.7 a.cc -arch ppc
> ld: unknown/unsupported architecture name for: -arch ppc
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> At the same time clang++-mp-3.4 works fine even though both clang 3.4
> and 3.7 are x86_64 only.
> 
> I'm now trying to rebuild everything as +universal (with ppc included
> in the list of universal architectures) and hope that it will work
> afterwards. But I would be grateful for ideas about why clang 3.4
> would be able to create ppc binaries and clang 3.7 not.
> 
> Thank you,
>   Mojca
> 
> PS: I'm not actually using the PPC, I'm doing this all for fun and as
> a challenge. But I don't have any VM with 10.5, so I wanted to do the
> cross-compiling step on VM with 10.6.

Maybe:

https://trac.macports.org/changeset/129356