Problems cross-compiling with clang 3.7 & 3.9 on 10.6

[Jeremy Huddleston Sequoia]

> On Mar 27, 2017, at 08:14, Mojca Miklavec <mojca at macports.org> wrote:
> 
> Hi,
> 
> After a long time I tried cross-compiling a few things on 10.6, but
> most attempts failed:
> 
>> clang-mp-3.4 -arch ppc test.c -o test
> 
> [OK]

IIRC, cfe just spawns llvm-gcc-4.2 when using -arch ppc in older versions.  I suspect 3.4 does that which is why it "works"


>> clang-mp-3.7 -arch i386 test.c -o test
> 
> [OK]
> 
>> clang-mp-3.7 -arch ppc test.c -o test
> ld: warning: ignoring file
> /opt/local/libexec/llvm-3.7/bin/../lib/clang/3.7.1/lib/darwin/libclang_rt.osx.a,
> missing required architecture ppc in file
> ld: symbol dyld_stub_binder not found (normally in libSystem.dylib).
> Needed to perform lazy binding to function _exit for architecture ppc
> clang: error: linker command failed with exit code 1 (use -v to see invocation)



>> clang-mp-3.9 test.c -o test
> ld: library not found for -lto_library
> clang: error: linker command failed with exit code 1 (use -v to see invocation)

>> clang-mp-3.9 -arch i386 test.c -o test
> ld: library not found for -lto_library
> clang: error: linker command failed with exit code 1 (use -v to see invocation)

>> clang-mp-3.9 -arch ppc test.c -o test
> ld: library not found for -lto_library
> clang: error: linker command failed with exit code 1 (use -v to see invocation)
> 
> Any hints about how to fix these issues?

What's the output of with '-v -Wl,-v'?


> Any tickets I found that that remotely resembled problems with lto
> have been closed.
> 
> With respect to ppc I probably just need to recompile the compiler
> with some proper universal flag? Is there any chance to enable some of
> that on the buildbot?
> 
> Mojca

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