#!/bin/sh

set -e

# llvm prefers an out-of-tree build.
cd ../build

cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_FLAGS_RELEASE_INIT="$SHARED_CFLAGS" \
    -DCMAKE_CXX_FLAGS_RELEASE_INIT="$SHARED_CXXFLAGS" \
    -DCMAKE_EXE_LINKER_FLAGS_RELEASE_INIT="$SHARED_LDFLAGS" \
    -DCMAKE_INSTALL_PREFIX="$PREFIX" \
    -DLLVM_ENABLE_ASSERTIONS=OFF \
    -DLLVM_ENABLE_CXXY1=ON \
    -DLLVM_ENABLE_FFI=ON \
    -DLLVM_ENABLE_PIC=ON \
    -DLLVM_ENABLE_ZLIB=ON \
    -DLLVM_ENABLE_RTTI=ON \
    -DLLVM_ENABLE_LIBCXX=OFF \
    -DLLVM_ENABLE_TERMINFO=ON \
    -DLLVM_ENABLE_SPHINX=OFF \
    -DLLVM_BUILD_DOCS=OFF \
    -DLLVM_BUILD_LLVM_DYLIB=ON \
    -DLLVM_BUILD_EXTERNAL_COMPILER_RT=ON \
    -DLLVM_BUILD_EXAMPLES=OFF \
    -DLLVM_INCLUDE_EXAMPLES=OFF \
    -DLLVM_APPEND_VC_REV=OFF \
    -DLLVM_PARALLEL_COMPILE_JOBS=$(nproc) \
    -DLLVM_PARALLEL_LINK_JOBS=$(nproc) \
    -DLLVM_TARGETS_TO_BUILD="host;AMDGPU;BPF" \
    -DLLVM_TARGET_TRIPLE="$BUILD" \
    -DLLVM_HOST_TRIPLE="$HOST" \
    -G "Unix Makefiles" \
    ../src

## explanation
#
# -DCMAKE_BUILD_TYPE: use all the optimisations.
#
# -G: use a unix-style, make-driven build process.