compilers on Lion

[Werner LEMBERG]

Folks,


macports newbie here :-)

I'm running a Lion box and I'm running macports from git, which works
just fine.  I've followed the advice on LibcxxOnOlderSystems and did

  cxx_stdlib         libc++
  buildfromsource    always        .

Attached you can see the list of software that I've installed so far.
In particular, I've installed `gcc8' and set it up as the default gcc
compiler, which I think is a good choice later on for lilypond-devel,
which doesn't like to be compiled with clang, AFAIK.  As the
maintainer of FreeType and ttfautohint I'm also curious whether my
stuff works correctly – there are some glitches here and there which I
want to fix eventually with macport push requests as soon as I'm more
acquainted with the system.

Note that I'm an old GNU/Linux user; I only work on the Mac for
software testing.

Now to my problems.  I stumbled across various issues for which I
can't find an explanation or solution in the net.  Some of them should
probably be directed directly to the tracker I guess...

* The concept of `subports' is not mentioned in `man port'.  Where is
  it described?  I can more or less deduce now how it works, but a
  formal description would be nice.

* I'm missing the ability to say

    port select --set emacs emacs23   .

  I see that there is https://trac.macports.org/ticket/56949, but even
  then it would be nice to have this since Lion comes with its own
  emacs binary.

* It's impossible to guess the difference between the `emacs' and
  `emacs-app' port from the output of `port info'.  The description of
  the former should mention that it is TTY only, while the latter uses
  the GUI.  Additionally, `emacs --help' contains a bunch of options
  for controlling the (X11) display, which are completely useless of
  course if Emacs can only be run on the terminal...

* Saying

    port install poppler

  returns

    --->  Computing dependencies for poppler
    The following dependencies will be installed: 
     clang-3.7
     clang-3.9
     clang-4.0
     clang-5.0
     libomp
     llvm-3.7
     llvm-3.9
     llvm-4.0
     llvm-5.0    .

  For me, this looks like a bad joke!  *Four* compilers are necessary
  for poppler?  Additionally, it seems that since clang 3.8 it is no
  longer necessary to have a separate `libomp' package at all, cf.

    https://openmp.llvm.org/    .

  Theoretically, my already installed gcc8 should compile this package
  just fine, right?  Why doesn't `port' consider it?  Looking into
  poppler's Portfile I don't see any compilers blacklisted.

  Please advise how to escape this dependency hell...

* Where can I get a concise and up-to-date description of portfiles?
  `portfiles.7' seems to be heavily out of date...

I will certainly find more issues soon, but this e-mail is already too
long :-)


    Werner

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