diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 58e41ed4..4e856173 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -71,6 +71,12 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v4
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 1500M
+          key: linux-native
+          verbose: 1
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -83,7 +89,7 @@ jobs:
           # Skip dynamic library dependencies that might make it harder to
           # run the binaries on other distros (and that have little use within
           # llvm-mingw).
-          LLVM_CMAKEFLAGS="-DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_TERMINFO=OFF -DLLDB_ENABLE_PYTHON=OFF" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra
+          LLVM_CMAKEFLAGS="-DLLVM_ENABLE_LIBXML2=OFF -DLLVM_ENABLE_TERMINFO=OFF -DLLDB_ENABLE_PYTHON=OFF" COMPILER_LAUNCHER="ccache" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
           RUN_I686=false RUN_X86_64=false ./run-tests.sh $(pwd)/install/llvm-mingw
           cd install
@@ -106,6 +112,12 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v4
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 500M
+          key: linux-cross-aarch64
+          verbose: 1
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -113,7 +125,7 @@ jobs:
           SOURCE_DATE_EPOCH: ${{needs.prepare.outputs.COMMIT_DATE_UNIX}}
         run: |
           sudo apt-get update && sudo apt-get install ninja-build g++-aarch64-linux-gnu
-          ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra --no-runtimes --host=aarch64-linux-gnu
+          COMPILER_LAUNCHER="ccache" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra --no-runtimes --host=aarch64-linux-gnu
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
       - uses: actions/download-artifact@v4
         with:
@@ -190,6 +202,12 @@ jobs:
     runs-on: macos-14
     steps:
       - uses: actions/checkout@v4
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 750M
+          key: macos
+          verbose: 1
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -204,7 +222,7 @@ jobs:
           # form. Therefore, autodetection will pick them up, but linking
           # universal binaries fails as those libraries are unavailable in the
           # other (arm64) architecture form.
-          MACOS_REDIST=1 LLVM_CMAKEFLAGS="-DLLVM_ENABLE_ZSTD=OFF -DLLDB_ENABLE_PYTHON=OFF" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra
+          MACOS_REDIST=1 LLVM_CMAKEFLAGS="-DLLVM_ENABLE_ZSTD=OFF -DLLDB_ENABLE_PYTHON=OFF" COMPILER_LAUNCHER="ccache" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
           RUN_I686=false RUN_X86_64=false ./run-tests.sh $(pwd)/install/llvm-mingw
           cd install
@@ -248,7 +266,14 @@ jobs:
             toolchain:p
             cmake:p
             ninja:p
+            ccache:p
       - uses: actions/checkout@v4
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 600M
+          key: msys2-${{matrix.sys}}
+          verbose: 1
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -260,7 +285,7 @@ jobs:
           if [ "${{matrix.sys}}" = "mingw64" ]; then
               ARGS="--disable-dylib"
           fi
-          ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra --disable-lldb $ARGS
+          COMPILER_LAUNCHER="ccache" ./build-all.sh $(pwd)/install/llvm-mingw --disable-clang-tools-extra --disable-lldb $ARGS
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
           ./copy-msys-dependencies.sh $(pwd)/install/llvm-mingw ${{matrix.sys}}
           ./run-tests.sh $(pwd)/install/llvm-mingw
@@ -301,6 +326,12 @@ jobs:
           sudo mv llvm-mingw* /opt/llvm-mingw
           echo /opt/llvm-mingw/bin >> $GITHUB_PATH
       - uses: actions/checkout@v4
+      - name: Setup ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          max-size: 800M
+          key: linux-cross-windows-${{matrix.arch}}
+          verbose: 1
       - name: Build
         env:
           LLVM_VERSION: ${{needs.prepare.outputs.LLVM_VERSION}}
@@ -311,7 +342,7 @@ jobs:
           BUILD_DATE: ${{needs.prepare.outputs.BUILD_DATE}}
         run: |
           sudo apt-get update && sudo apt-get install autoconf-archive ninja-build
-          ./build-cross-tools.sh /opt/llvm-mingw $(pwd)/install/llvm-mingw ${{matrix.arch}} --with-python
+          COMPILER_LAUNCHER="ccache" CCACHE_COMPILERCHECK="%compiler% -v" ./build-cross-tools.sh /opt/llvm-mingw $(pwd)/install/llvm-mingw ${{matrix.arch}} --with-python
           .github/workflows/store-version.sh install/llvm-mingw/versions.txt
           cd install
           NAME=llvm-mingw-$TAG-${{matrix.crt}}-${{matrix.arch}}