TERMUX_PKG_HOMEPAGE=https://clang.llvm.org/
TERMUX_PKG_DESCRIPTION="Modular compiler and toolchain technologies library"
TERMUX_PKG_LICENSE="NCSA"
TERMUX_PKG_MAINTAINER="@buttaface"
TERMUX_PKG_VERSION=11.0.0
TERMUX_PKG_SHA256=b7b639fc675fa1c86dd6d0bc32267be9eb34451748d2efd03f674b773000e92b
TERMUX_PKG_SRCURL=https://github.com/llvm/llvm-project/releases/download/llvmorg-$TERMUX_PKG_VERSION/llvm-project-$TERMUX_PKG_VERSION.tar.xz
TERMUX_PKG_HOSTBUILD=true
TERMUX_PKG_RM_AFTER_INSTALL="
lib/libgomp.a
lib/libiomp5.a
"
TERMUX_PKG_DEPENDS="binutils, libc++, ncurses, ndk-sysroot, libffi, zlib"
# Replace gcc since gcc is deprecated by google on android and is not maintained upstream.
# Conflict with clang versions earlier than 3.9.1-3 since they bundled llvm.
TERMUX_PKG_CONFLICTS="gcc, clang (<< 3.9.1-3)"
TERMUX_PKG_BREAKS="libclang, libclang-dev, libllvm-dev"
TERMUX_PKG_REPLACES="gcc, libclang, libclang-dev, libllvm-dev"
# See http://llvm.org/docs/CMake.html:
TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
-DPYTHON_EXECUTABLE=$(which python3)
-DLLVM_ENABLE_PIC=ON
-DLLVM_ENABLE_PROJECTS=clang;clang-tools-extra;compiler-rt;lld;lldb;openmp;polly
-DLLVM_ENABLE_LIBEDIT=OFF
-DLLVM_INCLUDE_TESTS=OFF
-DCLANG_DEFAULT_CXX_STDLIB=libc++
-DCLANG_INCLUDE_TESTS=OFF
-DCLANG_TOOL_C_INDEX_TEST_BUILD=OFF
-DDEFAULT_SYSROOT=$(dirname $TERMUX_PREFIX)
-DLLVM_LINK_LLVM_DYLIB=ON
-DLLDB_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/lldb-tblgen
-DLLVM_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/llvm-tblgen
-DCLANG_TABLEGEN=$TERMUX_PKG_HOSTBUILD_DIR/bin/clang-tblgen
-DLIBOMP_ENABLE_SHARED=FALSE
-DOPENMP_ENABLE_LIBOMPTARGET=OFF
-DLLVM_BINUTILS_INCDIR=$TERMUX_PREFIX/include
-DLLVM_ENABLE_SPHINX=ON
-DSPHINX_OUTPUT_MAN=ON
-DSPHINX_WARNINGS_AS_ERRORS=OFF
-DLLVM_TARGETS_TO_BUILD=all
-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=AVR;RISCV
-DPERL_EXECUTABLE=$(which perl)
-DLLVM_ENABLE_FFI=ON
-DANDROID_NDK_VERSION=${TERMUX_NDK_VERSION_NUM}
"

if [ $TERMUX_ARCH_BITS = 32 ]; then
	# Do not set _FILE_OFFSET_BITS=64
	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" -DLLVM_FORCE_SMALLFILE_FOR_ANDROID=on"
fi

TERMUX_PKG_FORCE_CMAKE=true
TERMUX_PKG_HAS_DEBUG=false
# Debug build succeeds but make install with:
# cp: cannot stat '../src/projects/openmp/runtime/exports/common.min.50.ompt.optional/include/omp.h': No such file or directory
# common.min.50.ompt.optional should be common.deb.50.ompt.optional when doing debug build

termux_step_host_build() {
	termux_setup_cmake
	termux_setup_ninja

	cmake -G Ninja -DLLVM_ENABLE_PROJECTS='clang;lldb' $TERMUX_PKG_SRCDIR/llvm
	ninja -j $TERMUX_MAKE_PROCESSES clang-tblgen lldb-tblgen llvm-tblgen
}

termux_step_pre_configure() {
	if [ "$TERMUX_PKG_QUICK_REBUILD" = "false" ]; then
		mkdir openmp/runtime/src/android
		cp $TERMUX_PKG_BUILDER_DIR/nl_types.h openmp/runtime/src/android
		cp $TERMUX_PKG_BUILDER_DIR/nltypes_stubs.cpp openmp/runtime/src/android
	fi

	# Add unknown vendor, otherwise it screws with the default LLVM triple
	# detection.
	export LLVM_DEFAULT_TARGET_TRIPLE=${CCTERMUX_HOST_PLATFORM/-/-unknown-}
	export LLVM_TARGET_ARCH
	if [ $TERMUX_ARCH = "arm" ]; then
		LLVM_TARGET_ARCH=ARM
	elif [ $TERMUX_ARCH = "aarch64" ]; then
		LLVM_TARGET_ARCH=AArch64
	elif [ $TERMUX_ARCH = "i686" ] || [ $TERMUX_ARCH = "x86_64" ]; then
		LLVM_TARGET_ARCH=X86
	else
		termux_error_exit "Invalid arch: $TERMUX_ARCH"
	fi
	# see CMakeLists.txt and tools/clang/CMakeLists.txt
	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" -DLLVM_TARGET_ARCH=$LLVM_TARGET_ARCH"
	TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" -DLLVM_HOST_TRIPLE=$LLVM_DEFAULT_TARGET_TRIPLE"
	export TERMUX_SRCDIR_SAVE=$TERMUX_PKG_SRCDIR
	TERMUX_PKG_SRCDIR=$TERMUX_PKG_SRCDIR/llvm
}

termux_step_post_configure() {
	TERMUX_PKG_SRCDIR=$TERMUX_SRCDIR_SAVE
}

termux_step_post_make_install() {
	if [ $TERMUX_ARCH = "arm" ]; then
		cp $TERMUX_PKG_SRCDIR/openmp/runtime/exports/common/include/omp.h $TERMUX_PREFIX/include
	else
		cp $TERMUX_PKG_SRCDIR/openmp/runtime/exports/common.ompt.optional/include/omp.h $TERMUX_PREFIX/include
	fi

	if [ "$TERMUX_CMAKE_BUILD" = Ninja ]; then
		ninja docs-llvm-man docs-lldb-man docs-clang-man
	else
		make docs-llvm-man docs-lldb-man docs-clang-man
	fi

	cp docs/man/* $TERMUX_PREFIX/share/man/man1
	cp tools/clang/docs/man/clang.1 $TERMUX_PREFIX/share/man/man1
	cp tools/lldb/docs/man/lldb.1 $TERMUX_PREFIX/share/man/man1
	cd $TERMUX_PREFIX/bin

	for tool in clang clang++ cc c++ cpp gcc g++ ${TERMUX_HOST_PLATFORM}-{clang,clang++,gcc,g++,cpp}; do
		ln -f -s clang-${TERMUX_PKG_VERSION:0:2} $tool
	done
}

termux_step_post_massage() {
	# Not added to the package but kept around on the host for other packages like rust,
	# which relies on LLVM, to use for configuration.
	sed $TERMUX_PKG_BUILDER_DIR/llvm-config.in \
		-e "s|@TERMUX_PKG_VERSION@|$TERMUX_PKG_VERSION|g" \
		-e "s|@TERMUX_PKG_SRCDIR@|$TERMUX_PKG_SRCDIR|g" \
		-e "s|@LLVM_DEFAULT_TARGET_TRIPLE@|$LLVM_DEFAULT_TARGET_TRIPLE|g" \
		-e "s|@TERMUX_PREFIX@|$TERMUX_PREFIX|g" > $TERMUX_PREFIX/bin/llvm-config
	chmod 755 $TERMUX_PREFIX/bin/llvm-config
}
