run on modern macOS (Catalina 10.15 or later) and on Apple Silicon outside Docker

[pts]

This issue was split from #154

A plan to make pdfsizeopt work and easy to install on modern Macs (including Apple Silicon, but also 64-bit x86):

• For this project, a modern Mac is running Mac OS X Leopard 10.5 or later (will also be tested with the most recent macOS on 2023-02) on either 64-bit x86 or Apple Silicon (64-bit ARM).
• Binaries will be compiled for 64-bit x86. Macs with Apple Silicon will run them using the built-in Rosetta 2 emulation.
• Binaries will be compiled within Docker running on Linux 64-bit x86 using the multiarch/crossbuild Docker image running osxcross. See example command-line.
• The following binaries will be provided:
  • python: Python 2.7, compiled from sources using https://github.com/pts/staticpython
  • gs: Ghostscript 9.14.1, compiled from sources (see @rbubley's porting work for instructions) or Ghostscript 9.05, compiled from sources (with patches by @pts, currently unreleased)
  • jbig2: Compiled from sources using https://github.com/pts/pdfsizeopt-jbig2/blob/master/c-darwinc64.sh
  • sam2p: It's actually imgdataopt renamed to sam2p, compiled from sources using https://github.com/pts/imgdataopt/blob/3bc94634e06dc21093055ded22336a9b0bab44b9/Makefile#L40
  • pngout: macOS 64-bit x86 binary downloaded from http://www.jonof.id.au/kenutils.html . Which is the minimum supported macOS version? Can we patch it to make it more backwards-compatible? Nevertheless, if it doesn't work, we can disable it with pdfsizeopt --use-pngout=no.
  • qpdf: Optional dependency, compiled from sources using https://github.com/pts/pts-qpdf

I've created https://github.com/pts/pts-osxcross for conveniently cross-compiling macOS amd64 C and C++ programs on Linux amd64.

Program executable binary download link: https://github.com/pts/pdfsizeopt/releases/download/2023-02-20/pdfsizeopt_libexec_darwinc64-v3.tar.gz .

Notes:

• Compiling from sources (C and C++) was done on Linux amd64 using the https://github.com/pts/pts-osxcross cross compiler targeting MacOS Leopard 10.5 and 64-bit Intel x86 processor.
• python: Downloaded from https://www.python.org/ftp/python/2.7.16/python-2.7.16-macosx10.6.pkg , and shell script to set up DYLD_LIBRARY_PATH added. It works on macOS Snow Leopard 10.6 or later. There was a system Python 2.7 (in /usr/bin/python) in macOS Big Sur 11 or earlier (with /usr/bin/python being Python 2.7) which worked, but it has been removed in macOS Montery 12, which only has Python 3 (as /usr/bin/python3).
• gs: Used the executable in Ghostscript 9.05 downloaded from https://ftp.math.utah.edu/pub/tex/historic/systems/mactex/2012/mactexadditions20120707.pkg
• jbig2: Compiled from sources: https://github.com/pts/pdfsizeopt-jbig2
• sam2p: Actually imgdataopt compiled from sources: https://github.com/pts/imgdataopt
• pngout: Reused the 64-bit Intel x86 executable from https://github.com/pts/pdfsizeopt/releases/download/2017-09-03d/pdfsizeopt_libexec_darwin-v1.tar.gz
• qpdf: QPDF 6.0.0 compiled from sources: https://github.com/pts/pts-qpdf

[pts]

It works on macOS Ventura 13.3, both with 64-bit Intel x86 (amd64, x86_64) processor and Apple Silicon (ARM processor). The programs are compiled for 64-bit Intel x86, and on Apple Silicon they are run by the built-in Rosetta 2 emulation.

Program binaries are available from https://github.com/pts/pdfsizeopt/releases/download/2023-02-20/pdfsizeopt_libexec_darwinc64-v3.tar.gz . Installation instructions on https://github.com/pts/pdfsizeopt have been updated.

[8573]

For this project, a modern Mac is running Mac OS X Leopard 10.5 or later

As someone who appreciates support for old hardware, I'd like to note my appreciation of this unusual definition of "modern". :-)