From e5dd69110e6f3e13b670aece5029c33e54e12f70 Mon Sep 17 00:00:00 2001
From: Ruizhe Zhao <vincentzhaorz@gmail.com>
Date: Mon, 13 Sep 2021 16:27:08 +0100
Subject: [PATCH] Don't cmake if it has been built

---
 scripts/build-llvm.sh | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/scripts/build-llvm.sh b/scripts/build-llvm.sh
index 32d00c4bb71..214c1d0f27e 100755
--- a/scripts/build-llvm.sh
+++ b/scripts/build-llvm.sh
@@ -36,21 +36,23 @@ mkdir -p build
 cd build
 
 # Configure CMake
-export CC=gcc
-export CXX=g++ 
-cmake ../llvm \
-  -DLLVM_ENABLE_PROJECTS="mlir;llvm;clang" \
-  -DCMAKE_BUILD_TYPE=RELEASE \
-  -DLLVM_BUILD_EXAMPLES=OFF \
-  -DLLVM_TARGETS_TO_BUILD="host" \
-  -DLLVM_OPTIMIZED_TABLEGEN=ON \
-  -DLLVM_ENABLE_OCAMLDOC=OFF \
-  -DLLVM_ENABLE_BINDINGS=OFF \
-  -DLLVM_INSTALL_UTILS=ON \
-  -DLLVM_ENABLE_ASSERTIONS=ON \
-  -DBUILD_POLYMER=ON \
-  -DPLUTO_LIBCLANG_PREFIX="$(llvm-config --prefix)" \
-  -G "${CMAKE_GENERATOR}"
+if [ ! -f "CMakeCache.txt" ]; then
+  export CC=gcc
+  export CXX=g++ 
+  cmake ../llvm \
+    -DLLVM_ENABLE_PROJECTS="mlir;llvm;clang" \
+    -DCMAKE_BUILD_TYPE=RELEASE \
+    -DLLVM_BUILD_EXAMPLES=OFF \
+    -DLLVM_TARGETS_TO_BUILD="host" \
+    -DLLVM_OPTIMIZED_TABLEGEN=ON \
+    -DLLVM_ENABLE_OCAMLDOC=OFF \
+    -DLLVM_ENABLE_BINDINGS=OFF \
+    -DLLVM_INSTALL_UTILS=ON \
+    -DLLVM_ENABLE_ASSERTIONS=ON \
+    -DBUILD_POLYMER=ON \
+    -DPLUTO_LIBCLANG_PREFIX="$(llvm-config --prefix)" \
+    -G "${CMAKE_GENERATOR}"
+fi 
  
 # Run building
 cmake --build . --target all -- -j "$(nproc)"