Ports: Upgrade LLVM to version 13.0.0

With this update, we now use our custom `serenity` Clang target, which
means that all system-specific compilation options (e.g. default PIE,
header search paths) will be handled automatically.

This port has been tested to build `Source/little` on all 4
toolchain-architecture pairs. Furthermore, `lib(std)c++` headers are
picked up correctly and our AK headers can be included without any
issues.

Due to recent kernel fixes related to memory-mapped files, the LLD
linker can now be used by default, so there's no need to also build the
GCC port alongside this.

Although our patches cover building libLLVM as a shared library, this is
currently not enabled by default, as DynamicLoader is very slow in
dealing with such a large number of relocations.

Ports/llvm/package.sh

@@ -1,11 +1,12 @@
 #!/usr/bin/env -S bash ../.port_include.sh
 port=llvm
 useconfigure=true
-version=12.0.0
+version=13.0.0
 workdir=llvm-project-llvmorg-${version}
 configopts=("-DCMAKE_TOOLCHAIN_FILE=${SERENITY_BUILD_DIR}/CMakeToolchain.txt")
-files="https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-${version}.zip llvm.zip f77723b70a5d4ab14899feda87d6cf601612165899abb2f6c7b670e517f45e2d"
+files="https://github.com/llvm/llvm-project/archive/refs/tags/llvmorg-${version}.zip llvm.zip 333a4e053fb543d9efb8dc68126d9e7a948ecb246985f2804a0ecbc5ccdb9d08"
 auth_type=sha256
+depends=("ncurses" "zlib")
 
 pre_patch() {
     host_env
@@ -18,25 +19,42 @@ pre_patch() {
 }
 
 configure() {
+    if [ "$SERENITY_TOOLCHAIN" = "Clang" ]; then
+        stdlib=""
+        unwindlib=""
+    else
+        stdlib="libstdc++"
+        unwindlib="libgcc"
+    fi
     mkdir -p llvm-build
     cmake ${workdir}/llvm \
+    -G Ninja \
     -B llvm-build "${configopts[@]}" \
     -DCMAKE_BUILD_TYPE=MinSizeRel \
-    -DLLVM_TARGETS_TO_BUILD=X86 \
+    -DCMAKE_FIND_ROOT_PATH="$SERENITY_BUILD_DIR"/Root \
+    -DCLANG_DEFAULT_CXX_STDLIB=$stdlib \
+    -DCLANG_DEFAULT_UNWINDLIB=$unwindlib \
+    -DCLANG_TABLEGEN=$(pwd)/llvm-host/bin/clang-tblgen \
+    -DCOMPILER_RT_BUILD_CRT=ON \
+    -DCOMPILER_RT_BUILD_ORC=OFF \
+    -DCOMPILER_RT_EXCLUDE_ATOMIC_BUILTIN=OFF \
+    -DCOMPILER_RT_OS_DIR=serenity \
+    -DHAVE_LIBRT=OFF \
+    -DLLVM_DEFAULT_TARGET_TRIPLE=$SERENITY_ARCH-pc-serenity \
     -DLLVM_ENABLE_PROJECTS="clang;lld;compiler-rt" \
-    -DLLVM_TABLEGEN=$(pwd)/llvm-host/bin/llvm-tblgen \
-    -DCMAKE_CROSSCOMPILING=True \
-    -DLLVM_DEFAULT_TARGET_TRIPLE=i386-none-gnueabi \
-    -DLLVM_TARGET_ARCH=X86 \
+    -DLLVM_HAVE_LIBXAR=OFF \
     -DLLVM_INCLUDE_BENCHMARKS=OFF \
     -DLLVM_INCLUDE_TESTS=OFF \
-    -DCLANG_TABLEGEN=$(pwd)/llvm-host/bin/clang-tblgen
+    -DLLVM_INSTALL_TOOLCHAIN_ONLY=ON \
+    -DLLVM_PTHREAD_LIB=pthread \
+    -DLLVM_TABLEGEN=$(pwd)/llvm-host/bin/llvm-tblgen \
+    -DLLVM_TARGETS_TO_BUILD=X86
 }
 
 build() {
-    make -C llvm-build -j $(nproc) --no-print-directory
+    ninja -C llvm-build
 }
 
 install() {
-    make -C llvm-build -j $(nproc) --no-print-directory install
+    ninja -C llvm-build install
 }