diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f5d1b2c587..d836cd9a81 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -32,22 +32,29 @@ jobs:
         with:
           path: src/chrome/build/pgo_profiles/
           key: pgo-linux-openwrt-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
-      - name: Cache AFDO (Android)
-        uses: actions/cache@v4
-        with:
-          path: src/chrome/android/profiles/
-          key: afdo-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
       - name: Cache Android NDK (Android)
         uses: actions/cache@v4
         with:
           path: src/third_party/android_toolchain/ndk/
           key: android-ndk-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
-      - run: ./get-clang.sh
-      - run: EXTRA_FLAGS='target_os="android"' ./get-clang.sh
+      - id: ccache-timestamp
+        run: echo "CCACHE_TIMESTAMP=$(date +%s)" >>$GITHUB_OUTPUT
+      - name: Host tool ccache
+        uses: actions/cache@v4
+        with:
+          path: src/.host_tool_cache
+          key: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-${{ steps.ccache-timestamp.outputs.CCACHE_TIMESTAMP }}
+          restore-keys: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-
+      - name: Install APT packages
+        run: |
+          sudo apt update
+          sudo apt install ninja-build pkg-config ccache
+      - run: EXTRA_FLAGS='target_os="android" target_cpu="x64"' ./get-clang.sh
       - run: |
           if [ ! -f qemu-user*.deb ]; then
             wget https://snapshot.debian.org/archive/debian/20250405T083429Z/pool/main/q/qemu/qemu-user_9.2.2%2Bds-1%2Bb2_amd64.deb
           fi
+      - run: EXTRA_FLAGS='target_os="android" target_cpu="x64"' WARMUP_HOST_TOOLS=1 ./build.sh
   cache-toolchains-win:
     runs-on: windows-2022
     steps:
@@ -139,6 +146,12 @@ jobs:
             src/out/sysroot-build/trixie/trixie_*
             src/out/sysroot-build/sid/sid_*
           key: sysroot-linux-${{ matrix.arch }}-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
+      - name: Host tool ccache
+        uses: actions/cache@v4
+        with:
+          path: src/.host_tool_cache
+          key: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-${{ steps.ccache-timestamp.outputs.CCACHE_TIMESTAMP }}
+          restore-keys: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-
       - id: ccache-timestamp
         run: echo "CCACHE_TIMESTAMP=$(date +%s)" >>$GITHUB_OUTPUT
       - name: Cache ccache files
@@ -208,11 +221,6 @@ jobs:
             src/gn/
             src/qemu-user*.deb
           key: toolchains-posix-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
-      - name: Cache AFDO (Android)
-        uses: actions/cache@v4
-        with:
-          path: src/chrome/android/profiles/
-          key: afdo-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
       - name: Cache Android NDK (Android)
         uses: actions/cache@v4
         with:
@@ -223,6 +231,12 @@ jobs:
         with:
           path: src/out/sysroot-build/android/
           key: sysroot-android-${{ matrix.arch }}-${{ hashFiles('CHROMIUM_VERSION') }}-v${{ env.CACHE_EPOCH }}
+      - name: Host tool ccache
+        uses: actions/cache@v4
+        with:
+          path: src/.host_tool_cache
+          key: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-${{ steps.ccache-timestamp.outputs.CCACHE_TIMESTAMP }}
+          restore-keys: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}-
       - id: ccache-timestamp
         run: echo "CCACHE_TIMESTAMP=$(date +%s)" >>$GITHUB_OUTPUT
       - name: Cache ccache files
@@ -602,6 +616,11 @@ jobs:
         with:
           path: src/out/sysroot-build/openwrt
           key: sysroot-openwrt-23.05.0-${{ matrix.arch }}-v${{ env.CACHE_EPOCH }}
+      - name: Host tool ccache
+        uses: actions/cache@v4
+        with:
+          path: src/.host_tool_cache
+          key: ccache-posix-${{ hashFiles('CHROMIUM_VERSION') }}
       - id: ccache-timestamp
         run: echo "CCACHE_TIMESTAMP=$(date +%s)" >>$GITHUB_OUTPUT
       - name: Cache ccache files
diff --git a/.gitignore b/.gitignore
index 0d98ee8d2a..639be9dc50 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,6 @@ src/gn/
 src/third_party/llvm-build/
 src/third_party/android_toolchain/
 src/out/
+src/.host_tool_cache/
 .vscode/
 *.pyc
diff --git a/src/build.sh b/src/build.sh
index cbffa32819..d78ec855d8 100755
--- a/src/build.sh
+++ b/src/build.sh
@@ -79,6 +79,8 @@ flags="$flags"'
 
   enable_backup_ref_ptr_support=false
   enable_dangling_raw_ptr_checks=false
+
+  use_clang_modules=false
 '
 
 if [ "$WITH_SYSROOT" ]; then
@@ -116,4 +118,16 @@ export DEPOT_TOOLS_WIN_TOOLCHAIN=0
 
 ./gn/out/gn gen "$out" --args="$flags $EXTRA_FLAGS"
 
+if [ "$host_os" = linux ]; then
+  clang_x64_targets=$(grep -o ' | .*' $out/toolchain.ninja | grep -o ' clang_x64/[^ ]*' | sort -u)
+  if [ "$clang_x64_targets" ]; then
+    CCACHE_DIR=$PWD/.host_tool_cache ccache -z
+    CCACHE_DIR=$PWD/.host_tool_cache ninja -C "$out" $clang_x64_targets
+    CCACHE_DIR=$PWD/.host_tool_cache ccache -s
+    if [ "$WARMUP_HOST_TOOLS" ]; then
+      exit 0
+    fi
+  fi
+fi
+
 ninja -C "$out" naive