llvm-3.4 @3.4.2_13 does not build +universal: because dep libffi not installed +universal

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/36746/steps/install-port/logs/stdio

checking for library containing ffi_call... no
configure: error: libffi not found - configure without --enable-libffi to compile without it

llvm-3.4 is part of the normal build chain (+llvm34 is the default variant of ld64 on 10.6 and 10.7) so keeping it working is important.

[kencu (Ken)]

It appears that both the 32bit and 64bit builds succeeded individually, but the universal build failed.

<​https://packages.macports.org/llvm-3.4/>

[kencu (Ken)]

On my 10.6.8 system, the build of llvm-3.4 +universal finished without any trouble:

$ port -v installed llvm-3.4
The following ports are currently installed:
  llvm-3.4 @3.4.2_12+universal platform='darwin 10' archs='i386 x86_64' date='2019-12-02T23:51:27-0800'
  llvm-3.4 @3.4.2_13+universal (active) platform='darwin 10' archs='i386 x86_64' date='2020-09-06T14:27:03-0700'

and when I just started another build of llvm-3.4 +universal under trace mode, it found libffi without any trouble:

checking for library containing ffi_call... -lffi

So now I have no idea what is wrong with the buildbot, exactly...must be something!

[kencu (Ken)]

it looks like the buildbot, building llvm-3.4 +universal, only installed the 64bit version of libffi for some reason.

system: /usr/bin/bzip2 -d -c /opt/local/var/macports/software/libffi/libffi-3.3_1.darwin_10.x86_64.tbz2 

that's probably why it failed to build universal.

now -- why?

[ryandesign (Ryan Carsten Schmidt)]

I wonder now if this is actually a bug in my lisaem port, which is the one that was trying to build when this failure was seen. lisaem calls wxWidgets.use wxWidgets-2.8 in a variant. I don't think I appreciated that wxWidgets.use wxWidgets-2.8 sets supported_archs, and it may be that supported_archs has to be set earlier, before variants are evaluated, to have the correct influence over whether dependencies use the universal variant or not. It's worth looking into anyway, and if it's not that, maybe something else about the wxWidgets-1.0 portgroup with which I'm not very familiar. I will try to figure it out.

[kencu (Ken)]

llvm-3.4 builds fine; must have been a local issue