Fix Travis CI to only build x86_64, and fix --with-macarchs flag

.travis.yml

@@ -18,7 +18,8 @@ env:
       vi_cv_dll_name_python3=/usr/local/Frameworks/Python.framework/Versions/3.9/Python
       vi_cv_dll_name_ruby=/usr/local/opt/ruby/lib/libruby.dylib
       VIMCMD=src/MacVim/build/Release/MacVim.app/Contents/MacOS/Vim
-      CONFOPT="--with-features=huge --enable-netbeans --with-tlib=ncurses --enable-cscope --enable-gui=macvim"
+      MACVIM_BIN=src/MacVim/build/Release/MacVim.app/Contents/MacOS/MacVim
+      CONFOPT="--with-features=huge --enable-netbeans --with-tlib=ncurses --enable-cscope --enable-gui=macvim --with-macarchs=x86_64"
       BASH_SILENCE_DEPRECATION_WARNING=1
 
 _anchors:
@@ -85,6 +86,10 @@ script:
   # Make sure there isn't any dynamic linkage to third-party dependencies in the built binary, as we should only use
   # static linkage to avoid dependency hell. Test that all those dylib's are in /usr/lib which is bundled with macOS and not third-party.
   - (! otool -L ${VIMCMD} | grep '\.dylib\s' | grep -v '^\s*/usr/lib/')
+  # Make sure we are building x86_64 only. arm64 builds don't work properly now, so we don't want to accidentally build
+  # it as it will get prioritized by Apple Silicon Macs.
+  - (lipo -archs ${VIMCMD} | grep '^x86_64$')
+  - (lipo -archs ${MACVIM_BIN} | grep '^x86_64$')
   - echo -en "travis_fold:end:smoketest\\r\\033[0K"
 
   # Run standard test suites.

src/auto/configure

@@ -4758,7 +4758,15 @@ fi
 $as_echo_n "checking if architectures are supported... " >&6; }
     save_cflags="$CFLAGS"
     save_ldflags="$LDFLAGS"
-    archflags=`echo "$ARCHS" | sed -e 's/[[:<:]]/-arch /g'`
+
+    # Apple's sed is supposed to treat [[:<:]] as word beginning, but seems
+    # like that broke some time ago and means *any* word character (but
+    # [[:>:]] still seems to work as word end).
+    # Use a more convoluted regex in order to properly to split the archs by
+    # word and prefix each with "-arch" to pass to the compiler.
+    #archflags=`echo "$ARCHS" | sed -e 's/[[[:<:]]]/-arch /g'`
+    archflags=`echo "$ARCHS" | sed 's/[[:>:]][ ][ ]*[[:<:]]/ -arch /g' | sed 's/^/-arch /g'`
+
     CFLAGS="$CFLAGS $archflags"
     LDFLAGS="$LDFLAGS $archflags"
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext

src/configure.ac

@@ -273,7 +273,15 @@ if test "`(uname) 2>/dev/null`" = Darwin; then
     AC_MSG_CHECKING(if architectures are supported)
     save_cflags="$CFLAGS"
     save_ldflags="$LDFLAGS"
-    archflags=`echo "$ARCHS" | sed -e 's/[[[:<:]]]/-arch /g'`
+
+    # Apple's sed is supposed to treat [[:<:]] as word beginning, but seems
+    # like that broke some time ago and means *any* word character (but
+    # [[:>:]] still seems to work as word end).
+    # Use a more convoluted regex in order to properly to split the archs by
+    # word and prefix each with "-arch" to pass to the compiler.
+    #archflags=`echo "$ARCHS" | sed -e 's/[[[:<:]]]/-arch /g'`
+    archflags=`echo "$ARCHS" | sed 's/[[[:>:]]][[ ]][[ ]]*[[[:<:]]]/ -arch /g' | sed 's/^/-arch /g'`
+
     CFLAGS="$CFLAGS $archflags"
     LDFLAGS="$LDFLAGS $archflags"
     AC_TRY_LINK([ ], [ ],