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

# any absolute path to the stdlib breaks the Makefile
export LEAN_PATH=

# 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}"\
	OUT="${LIB}"\
	LIB_OUT="${LIB}/lean"\
	OLEAN_OUT="${LIB}/lean"\
	BIN_OUT="${CMAKE_BINARY_DIR}/bin"\
	LEAN_OPTS+="${LEAN_EXTRA_MAKE_OPTS}"\
	LEANC_OPTS+="${LEANC_OPTS}"\
	LEAN_CXX="${CMAKE_CXX_COMPILER_LAUNCHER} ${CMAKE_CXX_COMPILER}"\
	LEAN_AR="${CMAKE_AR}"\
	MORE_DEPS+="${PREV_STAGE}/bin/lean${CMAKE_EXECUTABLE_SUFFIX}"\
	CMAKE_LIKE_OUTPUT=1\
	$(MORE_LEANMAKE_OPTS)

.PHONY: Init Std Lean leanshared Leanpkg

# 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)

Std: Init
	+"${LEAN_BIN}/leanmake" lib PKG=Std $(LEANMAKE_OPTS)

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

# This target will always be remade, but then not trigger further builds downstream if the .a file did not change
${LIB}/lean/libLean.a: Lean

${CMAKE_LIBRARY_OUTPUT_DIRECTORY}/libleanshared${CMAKE_SHARED_LIBRARY_SUFFIX}: ${LIB}/lean/libLean.a ${LIB}/lean/libleancpp.a ${CMAKE_BINARY_DIR}/runtime/libleanrt_initial-exec.a
	@echo "[    ] Building $@"
	"${LEAN_BIN}/leanc" -x none -shared -o $@ ${LEANSHARED_LINKER_FLAGS} ${LEANC_OPTS}

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

Leanpkg: Init Std Lean leanshared
	+"${LEAN_BIN}/leanmake" bin PKG=Leanpkg BIN_NAME=leanpkg${CMAKE_EXECUTABLE_SUFFIX} $(LEANMAKE_OPTS) LINK_OPTS='-lleanshared ${CMAKE_EXE_LINKER_FLAGS_MAKE}'