ci(macos): install boost from source (#1954)

.github/workflows/CI.yml

@@ -504,6 +504,8 @@ jobs:
     name: MacOS
     runs-on: macos-11
     needs: [check_changelog, setup_release]
+    env:
+      BOOST_VERSION: 1.83.0
 
     steps:
       - name: Checkout
@@ -514,10 +516,50 @@ jobs:
       - name: Setup Dependencies MacOS
         run: |
           # install dependencies using homebrew
-          brew install boost cmake curl node opus pkg-config
+          brew install cmake curl node openssl opus pkg-config
 
           # fix openssl header not found
-          ln -sf /usr/local/opt/openssl/include/openssl /usr/local/include/openssl
+          # ln -sf /usr/local/opt/openssl/include/openssl /usr/local/include/openssl
+
+          # by installing boost from source, several headers cannot be found...
+          # the above commented out link only works if boost is installed from homebrew... does not make sense
+          ln -sf $(find /usr/local/Cellar -type d -name "openssl" -path "*/openssl@3/*/include" | head -n 1) \
+            /usr/local/include/openssl
+
+          # fix opus header not found
+          ln -sf $(find /usr/local/Cellar -type d -name "opus" -path "*/opus/*/include" | head -n 1) \
+            /usr/local/include/opus
+
+      - name: Install Boost
+        # installing boost from homebrew takes 30 minutes in a GitHub runner
+        run: |
+          export BOOST_ROOT=${HOME}/boost-${BOOST_VERSION}
+
+          # install boost
+          wget \
+            https://github.com/boostorg/boost/releases/download/boost-${BOOST_VERSION}/boost-${BOOST_VERSION}.tar.gz \
+            --progress=bar:force:noscroll -q --show-progress
+          tar xf boost-${BOOST_VERSION}.tar.gz
+          cd boost-${BOOST_VERSION}
+
+          # libdir should be set by --prefix but isn't
+          ./bootstrap.sh \
+            --prefix=${BOOST_ROOT} \
+            --libdir=${BOOST_ROOT}/lib \
+            --with-libraries=locale,log,program_options,system,thread
+          ./b2 headers
+          ./b2 install \
+            --prefix=${BOOST_ROOT} \
+            --libdir=${BOOST_ROOT}/lib \
+            -j$(sysctl -n hw.ncpu) \
+            link=shared,static \
+            variant=release \
+            cxxflags=-std=c++14 \
+            cxxflags=-stdlib=libc++ \
+            linkflags=-stdlib=libc++
+
+          # put boost in cmake prefix path
+          echo "BOOST_ROOT=${BOOST_ROOT}" >> ${GITHUB_ENV}
 
       - name: Build MacOS
         env:
@@ -532,7 +574,7 @@ jobs:
             -DSUNSHINE_ASSETS_DIR=local/sunshine/assets \
             -DSUNSHINE_EXECUTABLE_PATH=/usr/bin/sunshine \
             ..
-          make -j ${nproc}
+          make -j $(sysctl -n hw.ncpu)
 
       - name: Package MacOS
         run: |