ld64 @97.17_4: error: Availability.h: No such file or directory

[ryandesign (Ryan Carsten Schmidt)]

I'm unable to build ld64 @97.17_4 on my PowerPC Tiger machine:

/Volumes/Data/macports/tiger/Developer/SDKs/Darwin8.sdk/usr/include/libunwind.h:29:28: error: Availability.h: No such file or directory

[jeremyhu (Jeremy Huddleston Sequoia)]

libunwind-headers need to be updated for better Tiger support.

Related to ​http://www.llvm.org/bugs/show_bug.cgi?id=17513

[ryandesign (Ryan Carsten Schmidt)]

That bug was opened October 2013, though I see there was some activity from you today. Do we think this is an easy problem to fix soon? As it stands, no ports can be built on Tiger, since all ports on Tiger depend on apple-gcc42 which depends on the now unbuildable ld64.

[jeremyhu (Jeremy Huddleston Sequoia)]

Yeah, that's just a reminder for me to send my changes upstream at that location when I make them, so others outside of MacPorts can benefit.

Yes. It should be fairly easy.

We just want to change from using Availability.h to AvailabilityMacros.h on Tiger.

[jeremyhu (Jeremy Huddleston Sequoia)]

This should unblock you:

1. Update to r131424
2. Update config.h installed by libunwind-headers to change the '#if APPLE' to '#if APPLE && !defined(USE_MACPORTS_LIBUNWIND)' in config.h

I'm working on a better solution for this.

[jeremyhu (Jeremy Huddleston Sequoia)]

r131425