Add macOS Quick Start to README.macos

README.macos

@@ -1,3 +1,40 @@
+MacOS Quick Start (Using Homebrew)
+-----------------------------------
+
+> Note that this method is particularly recommended for M1 and later Macs.
+
+1. Install the latest Xcode from the MacOS app store.
+   See https://guide.macports.org/#installing.xcode for details.
+
+2. Install Homebrew (https://brew.sh/)
+
+3. From the top-level source directory, run tools/macos-setup-brew.sh and wait
+   for it to complete.
+
+   Note: You may set the environment variable HOMEBREW_NO_AUTO_UPDATE=1 if you
+         do not want the script to update homebrew.
+
+4. Create a build directory and enter it:
+    mkdir build && cd build
+
+5. Configure the build:
+    cmake ..
+
+6. Build wireshark!
+    make -j
+
+The wireshark binary will be found at run/wireshark under your build directory.
+
+Note that for subsequent builds, you will only need to enter the build
+directory and run "make -j".
+
+Note that if you cannot use homebrew, or otherwise need to manually install
+prerequisites, you cannot use this method; continue reading for more detailed
+instructions.
+
+
+Non-Homebrew Setup and Build of Wireshark for macOS
+----------------------------------------------------
 This file tries to help building Wireshark for macOS (The Operating
 System Formerly Known As Mac OS X And Then OS X) (Wireshark does not
 work on the classic Mac OS).
@@ -14,6 +51,7 @@ for details.  For Xcode 4, you will need to install the command-line
 tools; select Preferences from the Xcode menu, select Downloads in the
 Preferences window, and install Command Line Tools.
 
+
 You must also have GLib and, if you want to build Wireshark as well as
 TShark, you must have also Qt installed.  You can download precompiled
 Qt packages and source code from

tools/macos-setup-brew.sh

@@ -13,6 +13,7 @@ set -e -u -o pipefail
 
 eval "$(brew shellenv)"
 
+HOMEBREW_NO_AUTO_UPDATE=${HOMEBREW_NO_AUTO_UPDATE:-}
 # Update to last brew release
 if [ -z "$HOMEBREW_NO_AUTO_UPDATE" ] ; then
     brew update