Experiments with ccache, enable LTO for win32 build

.github/workflows/build.yml

@@ -71,6 +71,7 @@ jobs:
           LDFLAGS: -static-libgcc -static-libstdc++
           PKG_CONFIG_PATH: /usr/lib/arm-linux-gnueabihf/pkgconfig
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:${PATH}"
           make features
           make WITH_LTO=true -j $(nproc)
       - name: Set sha8
@@ -125,6 +126,9 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
+      - name: Set up ccache
+        uses: hendrikmuhs/ccache-action@v1
+        key: linux-x86_64
       - name: Set up dependencies
         run: |
           sudo apt-get update -qq
@@ -133,6 +137,7 @@ jobs:
         env:
           LDFLAGS: -static-libgcc -static-libstdc++
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:${PATH}"
           make features
           make WITH_LTO=true -j $(nproc)
       - name: Set sha8
@@ -215,12 +220,16 @@ jobs:
         run: |
           sudo rm -Rf /Library/Developer/CommandLineTools/SDKs/*
           sudo xcode-select -s "/Applications/Xcode_12.3.app"
+      - name: Set up ccache
+        uses: hendrikmuhs/ccache-action@v1
+        key: macOS-universal
       - name: Build macOS universal
         env:
           CFLAGS: -arch x86_64 -arch arm64 -DMAC_OS_X_VERSION_MAX_ALLOWED=MAC_OS_X_VERSION_10_12 -mmacosx-version-min=10.12 -mtune=generic -msse -msse2
           CXXFLAGS: -arch x86_64 -arch arm64 -DMAC_OS_X_VERSION_MAX_ALLOWED=MAC_OS_X_VERSION_10_12 -mmacosx-version-min=10.12 -mtune=generic -msse -msse2
           LDFLAGS: -arch x86_64 -arch arm64 -mmacosx-version-min=10.12
         run: |
+          export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:${PATH}"
           make features
           make NOOPT=true WITH_LTO=true -j $(sysctl -n hw.logicalcpu)
           ./dpf/utils/package-osx-bundles.sh
@@ -256,7 +265,7 @@ jobs:
           WINEDLLOVERRIDES: "mscoree,mshtml="
         run: |
           make features
-          make -j $(nproc)
+          make WITH_LTO=true -j $(nproc)
       - name: Set sha8
         id: slug
         run: echo "::set-output name=sha8::$(echo ${{ github.sha }} | cut -c1-8)"