llvm: better build

extra/llvm/build

@@ -1,20 +1,19 @@
 #!/bin/sh -e
 
-mkdir -p build
-cd build
+export DESTDIR="$1"
 
-cmake \
+cmake -B build \
     -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_TARGETS_TO_BUILD="host;AMDGPU" \
     -DLLVM_ENABLE_RTTI=ON \
     -DLLVM_HOST_TRIPLE="$(cc -dumpmachine)" \
     -DLLVM_BUILD_EXAMPLES=OFF \
     -DLLVM_BUILD_DOCS=OFF \
     -DLLVM_BUILD_TESTS=OFF \
-    -Wno-dev -G "Unix Makefiles" ..
+    -Wno-dev
 
-make
-make DESTDIR="$1" install
+cmake --build   build
+cmake --install build