diff --git a/cmake/ClangToolchain.cmake b/cmake/ClangToolchain.cmake
index d781bab86..b5ae35af2 100644
--- a/cmake/ClangToolchain.cmake
+++ b/cmake/ClangToolchain.cmake
@@ -2,12 +2,13 @@ if ($ENV{CLANG_VERSION})
 	SET (CLANG_VERSION "-$ENV{CLANG_VERSION}")
 endif()
 
+SET (CLANG_WARNINGS "-pedantic -Weverything -Wno-padded -Wno-covered-switch-default -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-cast-align")
+
 SET (CMAKE_C_COMPILER             "/usr/bin/clang${CLANG_VERSION}" CACHE PATH "")
-SET (CMAKE_C_FLAGS                "-pedantic -Wall -std=gnu99" CACHE STRING "")
-SET (CMAKE_C_FLAGS_DEBUG          "-g" CACHE STRING "")
-SET (CMAKE_C_FLAGS_MINSIZEREL     "-Os -DNDEBUG" CACHE STRING "")
-SET (CMAKE_C_FLAGS_RELEASE        "-O4 -DNDEBUG" CACHE STRING "")
-SET (CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -g" CACHE STRING "")
+SET (CMAKE_C_FLAGS                ${CLANG_WARNINGS} CACHE STRING "")
+
+SET (CMAKE_CXX_COMPILER             "/usr/bin/clang++${CLANG_VERSION}" CACHE PATH "")
+SET (CMAKE_CXX_FLAGS                ${CLANG_WARNINGS} CACHE STRING "")
 
 SET (CMAKE_AR      "/usr/bin/llvm-ar${CLANG_VERSION}" CACHE PATH "")
 SET (CMAKE_LINKER  "/usr/bin/llvm-link${CLANG_VERSION}" CACHE PATH "")
diff --git a/tools/build-clang.sh b/tools/build-clang.sh
new file mode 100755
index 000000000..c5e721021
--- /dev/null
+++ b/tools/build-clang.sh
@@ -0,0 +1,23 @@
+#!/bin/bash -xe
+SCRIPT_PATH=$(dirname "${BASH_SOURCE[0]}")
+SCRIPT_PATH=$(realpath "$SCRIPT_PATH")
+
+cmake \
+    -GNinja \
+    -DCMAKE_TOOLCHAIN_FILE="$SCRIPT_PATH/../cmake/ClangToolchain.cmake" \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_FIND_LIBRARY_SUFFIXES=".a;.so" \
+    -DBUILD_SHARED_LIBS=OFF \
+    -Bclang \
+    -S"$SCRIPT_PATH/.." \
+    -DCMAKE_INSTALL_PREFIX=/tmp/xxx \
+    -DWITH_SERVER=ON \
+    -DWITH_SAMPLE=ON \
+    -DWITH_CAIRO=ON \
+    -DWITH_FFMPEG=ON \
+    -DWITH_DSP_FFMPEG=ON \
+    -DWITH_PKCS11=ON \
+    -DWITH_SOZR=ON \
+    -DWITH_WAYLAND=ON \
+    -DWITH_WEBVIEW=ON \
+    -DWITH_SWSCALE=ON