Eliminate 32-bit Mac build/packaging support

The scales have now tilted overwhelmingly in favor of eliminating
support for 32-bit Macs:

- 32-bit applications are only necessary in order to support OS X 10.5
  "Leopard" and OS X 10.6 "Snow Leopard".  OS X 10.7 "Lion" requires a
  64-bit Mac and supports all 64-bit Macs.
- 32-bit applications are no longer allowed in the macOS App Store.
- 32-bit applications no longer run in macOS 10.15 "Catalina".
- 32-bit applications do not support thread-local storage, so the
  TurboJPEG API library's global error handler is not thread-safe with
  such applications.
- libjpeg-turbo 2.1.x no longer supports 32-bit iOS apps, so it makes
  sense to also eliminate support for 32-bit macOS applications.

It's time.

.travis.yml

@@ -68,7 +68,7 @@ before_install:
       pushd $HOME/Downloads &&
       curl -LO https://raw.githubusercontent.com/GiovanniBussi/macports-ci/master/macports-ci &&
       . ./macports-ci install &&
-      sudo /opt/local/bin/port -N install gcc6 yasm md5sha1sum &&
+      sudo /opt/local/bin/port -N install yasm md5sha1sum &&
       popd &&
       git clone --depth=1 https://github.com/libjpeg-turbo/gas-preprocessor.git ~/src/gas-preprocessor &&
       ln -fs /Applications/Xcode.app /Applications/Xcode83.app;

ChangeLog.md

@@ -38,10 +38,10 @@ supported, and the libjpeg-turbo build system can no longer be used to package
 such builds.  32-bit iOS apps cannot run in iOS 11 and later, and the App Store
 no longer allows them.
 
-4. The TurboJPEG Java wrapper in the "official" libjpeg-turbo SDK for macOS no
+4. 32-bit (i386) OS X/macOS builds of libjpeg-turbo are no longer supported,
-longer supports 32-bit Java virtual machines.  Oracle no longer provides a
+and the libjpeg-turbo build system can no longer be used to package such
-32-bit JVM for macOS, and Apple's implementation of Java 1.6 (Java for OS X
+builds.  32-bit Mac applications cannot run in macOS 10.15 "Catalina" and
-systems) is long obsolete.
+later, and the App Store no longer allows them.
 
 5. The SSE2 (x86 SIMD) and C Huffman encoding algorithms have been
 significantly optimized, resulting in a measured average overall compression

cmakescripts/BuildPackages.cmake

@@ -119,8 +119,6 @@ endif() # WIN32
 
 if(APPLE)
 
-set(OSX_32BIT_BUILD "" CACHE PATH
-  "Directory containing 32-bit (i386) Mac build to include in universal binaries")
 set(IOS_ARMV8_BUILD "" CACHE PATH
   "Directory containing ARMv8 iOS build to include in universal binaries")
 

release/makemacpkg.in

@@ -51,7 +51,6 @@ PKGNAME=@PKGNAME@
 VERSION=@VERSION@
 BUILD=@BUILD@
 SRCDIR=@CMAKE_CURRENT_SOURCE_DIR@
-BUILDDIR32=@OSX_32BIT_BUILD@
 BUILDDIRARMV8=@IOS_ARMV8_BUILD@
 WITH_JAVA=@WITH_JAVA@
 OSX_APP_CERT_NAME="@OSX_APP_CERT_NAME@"
@@ -99,61 +98,6 @@ if [ "$PREFIX" = "@CMAKE_INSTALL_DEFAULT_PREFIX@" -a "$DOCDIR" = "@CMAKE_INSTALL
 	ln -fs /Library/Documentation/$PKGNAME $PKGROOT$DOCDIR
 fi
 
-if [ "$BUILDDIR32" != "" ]; then
-	if [ ! -d $BUILDDIR32 ]; then
-		echo ERROR: 32-bit build directory $BUILDDIR32 does not exist
-		exit 1
-	fi
-	if [ ! -f $BUILDDIR32/Makefile ]; then
-		echo ERROR: 32-bit build directory $BUILDDIR32 is not configured
-		exit 1
-	fi
-	mkdir -p $TMPDIR/dist.x86
-	pushd $BUILDDIR32
-	make install DESTDIR=$TMPDIR/dist.x86
-	popd
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$LIBDIR/$LIBJPEG_DSO_NAME \
-		-arch x86_64 $PKGROOT/$LIBDIR/$LIBJPEG_DSO_NAME \
-		-output $PKGROOT/$LIBDIR/$LIBJPEG_DSO_NAME
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$LIBDIR/libjpeg.a \
-		-arch x86_64 $PKGROOT/$LIBDIR/libjpeg.a \
-		-output $PKGROOT/$LIBDIR/libjpeg.a
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$LIBDIR/$TURBOJPEG_DSO_NAME \
-		-arch x86_64 $PKGROOT/$LIBDIR/$TURBOJPEG_DSO_NAME \
-		-output $PKGROOT/$LIBDIR/$TURBOJPEG_DSO_NAME
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$LIBDIR/libturbojpeg.a \
-		-arch x86_64 $PKGROOT/$LIBDIR/libturbojpeg.a \
-		-output $PKGROOT/$LIBDIR/libturbojpeg.a
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/cjpeg \
-		-arch x86_64 $PKGROOT/$BINDIR/cjpeg \
-		-output $PKGROOT/$BINDIR/cjpeg
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/djpeg \
-		-arch x86_64 $PKGROOT/$BINDIR/djpeg \
-		-output $PKGROOT/$BINDIR/djpeg
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/jpegtran \
-		-arch x86_64 $PKGROOT/$BINDIR/jpegtran \
-		-output $PKGROOT/$BINDIR/jpegtran
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/tjbench \
-		-arch x86_64 $PKGROOT/$BINDIR/tjbench \
-		-output $PKGROOT/$BINDIR/tjbench
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/rdjpgcom \
-		-arch x86_64 $PKGROOT/$BINDIR/rdjpgcom \
-		-output $PKGROOT/$BINDIR/rdjpgcom
-	$LIPO -create \
-		-arch i386 $TMPDIR/dist.x86/$BINDIR/wrjpgcom \
-		-arch x86_64 $PKGROOT/$BINDIR/wrjpgcom \
-		-output $PKGROOT/$BINDIR/wrjpgcom
-fi
-
 install_ios()
 {
 	BUILDDIR=$1