SHELL := /usr/bin/env bash -euo pipefail

# any absolute path to the stdlib breaks the Makefile
export LEAN_PATH=
export LEAN_CC=${CMAKE_C_COMPILER_LAUNCHER} ${CMAKE_C_COMPILER}

# LEAN_OPTS: don't use native code (except for primitives) since it is from the previous stage
# MORE_DEPS: rebuild the stdlib whenever the compiler has changed
LEANMAKE_OPTS=\
	LEAN="${CMAKE_CROSSCOMPILING_EMULATOR} ${PREV_STAGE}/bin/lean${CMAKE_EXECUTABLE_SUFFIX}"\
	LEANC="${CMAKE_BINARY_DIR}/leanc.sh"\
	OUT="${LIB}"\
	LIB_OUT="${LIB}/lean"\
	OLEAN_OUT="${LIB}/lean"\
	BIN_OUT="${CMAKE_BINARY_DIR}/bin"\
	LEAN_OPTS+="${LEAN_EXTRA_MAKE_OPTS} -DwarningAsError=true"\
	LEANC_OPTS+="${LEANC_OPTS}"\
	LEAN_AR="${CMAKE_AR}"\
	MORE_DEPS+="${PREV_STAGE}/bin/lean${CMAKE_EXECUTABLE_SUFFIX}"\
	CMAKE_LIKE_OUTPUT=1

ifeq "${STAGE}" "0"
  LEANMAKE_OPTS+=C_ONLY=1 C_OUT=../stdlib/
endif

.PHONY: Init Lean leanshared Lake lean

# These can be phony since the inner Makefile will have the correct dependencies and avoid rebuilds
Init:
# Use `+` to use the Make jobserver with `leanmake` for parallelized builds
	+"${LEAN_BIN}/leanmake" lib PKG=Init $(LEANMAKE_OPTS) LEANC_OPTS+=-DLEAN_EXPORTING

Lean: Init
	+"${LEAN_BIN}/leanmake" lib PKG=Lean $(LEANMAKE_OPTS) LEANC_OPTS+=-DLEAN_EXPORTING

# the following targets are all invoked by separate `make` calls; see src/CMakeLists.txt

# we specify the precise file names here to avoid rebuilds
${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libleanshared${CMAKE_SHARED_LIBRARY_SUFFIX}: ${LIB}/lean/libInit.a ${LIB}/lean/libLean.a ${LIB}/lean/libleancpp.a ${CMAKE_BINARY_DIR}/runtime/libleanrt_initial-exec.a
	@echo "[    ] Building $@"
	"${CMAKE_BINARY_DIR}/leanc.sh" -shared -o $@ ${LEANSHARED_LINKER_FLAGS} ${LEANC_OPTS}

leanshared: ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libleanshared${CMAKE_SHARED_LIBRARY_SUFFIX}

Lake:
# must put lake in its own directory because of submodule, so must adjust relative paths...
	+"${LEAN_BIN}/leanmake" -C lake bin PKG=Lake BIN_NAME=lake${CMAKE_EXECUTABLE_SUFFIX} $(LEANMAKE_OPTS) LINK_OPTS='-lleanshared ${CMAKE_EXE_LINKER_FLAGS_MAKE_MAKE}' OUT="../${LIB}" LIB_OUT="../${LIB}/lean" OLEAN_OUT="../${LIB}/lean"

${CMAKE_BINARY_DIR}/bin/lean${CMAKE_EXECUTABLE_SUFFIX}: ${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libleanshared${CMAKE_SHARED_LIBRARY_SUFFIX} $(LEAN_SHELL)
	@echo "[    ] Building $@"
	"${CMAKE_BINARY_DIR}/leanc.sh" $(LEAN_SHELL) -lleanshared ${CMAKE_EXE_LINKER_FLAGS_MAKE} ${LEAN_EXE_LINKER_FLAGS} ${LEANC_OPTS} -o $@

lean: ${CMAKE_BINARY_DIR}/bin/lean${CMAKE_EXECUTABLE_SUFFIX}

Leanc:
	+"${LEAN_BIN}/leanmake" bin PKG=Leanc BIN_NAME=leanc${CMAKE_EXECUTABLE_SUFFIX} $(LEANMAKE_OPTS) LINK_OPTS='-lleanshared ${CMAKE_EXE_LINKER_FLAGS_MAKE_MAKE}' OUT="${CMAKE_BINARY_DIR}" OLEAN_OUT="${CMAKE_BINARY_DIR}"