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

[Jeremy Huddleston Sequoia]

> On Mar 11, 2016, at 02:14, Mojca Miklavec <mojca at macports.org> wrote:
> 
> Hi,
> 
> A few more questions:
> 
> (1) If I want to target 10.5 from 10.6 I probably need libmacho and
> libunwind as well? What about these lines from libcxxabi? Are they
> most likely needed or not?
> 
>        pre-build {
>            system "nm -g ${prefix}/lib/libmacho.a 2> /dev/null | grep
> ' \[DST\] ' | awk '{print \$3}' >
> ${worksrcpath}/unexported_symbols_macho"
>            system "nm -g ${prefix}/lib/libunwind.a 2> /dev/null |
> grep ' \[DST\] ' | awk '{print \$3}' | grep -v '^__Unwind' >
> ${worksrcpath}/unexported_symbols_unwind"
>            system "cat ${worksrcpath}/unexported_symbols_macho
> ${worksrcpath}/unexported_symbols_unwind >
> ${worksrcpath}/unexported_symbols"
>        }

That just ensures that the build libc++abi.dylib doesn't re-export libunwind and libmacho.  Yes, you want to include those lines.

> 
>        build.env-append \
>            EXTRA_LDFLAGS="${prefix}/lib/libmacho.a
> ${prefix}/lib/libunwind.a -unexported_symbols_list
> ${worksrcpath}/unexported_symbols"
> 
> 
> (2) Installing libunwind +universal (with clang 3.4) fails with
> "clang: error: unknown argument: '-fno-integrated-as'". If I remove
> that flag from the Portfile it fails with
> 
> ld: absolute addressing (perhaps -mdynamic-no-pic) used in
> _unwind_phase2 from ./UnwindLevel1.o not allowed in slidable image.
> Use '-read_only_relocs suppress' to enable text relocs
> 
> and if I try to compile it with clang 3.7 it start installing gdbm
> (most likely it tries to build clang 3.7 + universal) and fails.
> 
> If I don't need libunwind on 10.6 (for 10.5), then I'll skip it. If I
> do, I need to find a workaround.
> 
> Thank you,
>    Mojca

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