diff --git a/testing/llvm/build b/testing/llvm/build
new file mode 100755
index 000000000..11e6b73dc
--- /dev/null
+++ b/testing/llvm/build
@@ -0,0 +1,30 @@
+#!/bin/sh -e
+
+mkdir -p build
+cd build
+
+cmake \
+    -DCMAKE_INSTALL_PREFIX=/usr \
+    -DCMAKE_BUILD_TYPE=Release \
+    -DLLVM_BUILD_LLVM_DYLIB=ON \
+    -DLLVM_LINK_LLVM_DYLIB=ON \
+    -DLLVM_TARGETS_TO_BUILD="host;X86;AMDGPU" \
+    -DLLVM_ENABLE_PROJECTS="clang;compiler-rt;libcxx;libcxxabi;libunwind" \
+    -DLLVM_ENABLE_RTTI=ON \
+    -DLLVM_HOST_TRIPLE="$(cc -dumpmachine)" \
+    -DLLVM_BUILD_EXAMPLES=OFF \
+    -DLLVM_BUILD_DOCS=OFF \
+    -DLLVM_BUILD_TESTS=OFF \
+    -DLLVM_ENABLE_LIBCXX=ON \
+    -DLIBCXXABI_USE_LLVM_UNWINDER=ON \
+    -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON \
+    -DLIBCXX_USE_COMPILER_RT=ON \
+    -DLIBCXXABI_USE_COMPILER_RT=ON \
+    -DLIBUNWIND_USE_COMPILER_RT=ON \
+    -DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=OFF \
+    -DCLANG_DEFAULT_CXX_STDLIB=libc++ \
+    -DCLANG_DEFAULT_RTLIB=compiler-rt \
+    -Wno-dev -G Ninja "$OLDPWD/llvm"
+
+ninja all
+DESTDIR="$1" ninja install
diff --git a/testing/llvm/checksums b/testing/llvm/checksums
new file mode 100644
index 000000000..958d59c75
--- /dev/null
+++ b/testing/llvm/checksums
@@ -0,0 +1,6 @@
+d6a0565cf21f22e9b4353b2eb92622e8365000a9e90a16b09b56f8157eabfe84  llvm-9.0.0.src.tar.xz
+7ba81eef7c22ca5da688fdf9d88c20934d2d6b40bfe150ffd338900890aa4610  cfe-9.0.0.src.tar.xz
+56e4cd96dd1d8c346b07b4d6b255f976570c6f2389697347a6c3dcb9e820d10e  compiler-rt-9.0.0.src.tar.xz
+3c4162972b5d3204ba47ac384aa456855a17b5e97422723d4758251acf1ed28c  libcxx-9.0.0.src.tar.xz
+675041783565c906ac2f7f8b2bc5c40f14d871ecfa8ade34855aa18de95530e9  libcxxabi-9.0.0.src.tar.xz
+976a8d09e1424fb843210eecec00a506b956e6c31adda3b0d199e945be0d0db2  libunwind-9.0.0.src.tar.xz
diff --git a/testing/llvm/depends b/testing/llvm/depends
new file mode 100644
index 000000000..ee53aec0d
--- /dev/null
+++ b/testing/llvm/depends
@@ -0,0 +1,4 @@
+cmake  make
+python make
+ninja
+zlib
diff --git a/testing/llvm/sources b/testing/llvm/sources
new file mode 100644
index 000000000..fe61cb59b
--- /dev/null
+++ b/testing/llvm/sources
@@ -0,0 +1,6 @@
+https://releases.llvm.org/9.0.0/llvm-9.0.0.src.tar.xz llvm/
+https://releases.llvm.org/9.0.0/cfe-9.0.0.src.tar.xz clang/
+https://releases.llvm.org/9.0.0/compiler-rt-9.0.0.src.tar.xz compiler-rt/
+https://releases.llvm.org/9.0.0/libcxx-9.0.0.src.tar.xz libcxx/
+https://releases.llvm.org/9.0.0/libcxxabi-9.0.0.src.tar.xz libcxxabi/
+https://releases.llvm.org/9.0.0/libunwind-9.0.0.src.tar.xz libunwind/
diff --git a/testing/llvm/version b/testing/llvm/version
new file mode 100644
index 000000000..f8041b0ab
--- /dev/null
+++ b/testing/llvm/version
@@ -0,0 +1 @@
+9.0.0 1