Makefile.smallos

# Makefile magic to determine the Soletta directory based on this very file.
thisdir := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))

# Set variables that the build system including this file can use
soletta_sysroot := $(thisdir)/build/soletta_sysroot
soletta_include_dir := $(soletta_sysroot)/usr/include/soletta
soletta_lib_dir := $(soletta_sysroot)/usr/lib
soletta_node_descriptions := $(soletta_sysroot)/usr/share/soletta/flow/descriptions
soletta_target := $(soletta_lib_dir)/libsoletta.a
# End of usable variables

ifdef TOOLCHAIN_PREFIX
export TOOLCHAIN_PREFIX
got_cc := yes
got_ar := yes
else
ifdef TARGETCC
export TARGETCC
got_cc := yes
endif
ifdef TARGETAR
export TARGETAR
got_ar := yes
endif
endif

ifneq (yesyes,$(got_cc)$(got_ar))
$(error "Build toolchain not set. Missing variables TOOLCHAIN_PREFIX or TARGETCC and TARGETAR.")
endif

ifndef CFLAGS
$(warning "CFLAGS not set. This is probably an error")
endif
ifndef LDFLAGS
$(warning "LDFLAGS not set. This is probably an error")
endif

# No pkg-config for small OSes, so ensure the dependency resolver doesn't find
# and try to use things we don't want.
export PKG_CONFIG_LIBDIR=

# Make sure that variables that some OSes use on their build don't get
# propagated to Soletta's build, as they may conflict.
unexport BINDIR PREFIX

# Make CFLAGS and LDFLAGS available to Soletta's build system for configuration.
export CFLAGS LDFLAGS

soletta_config := $(thisdir)/.config

# Target local variables, so we are able to re-define them for Soletta without
# touching the OS build system
$(soletta_target) $(soletta_config): private override MAKEFLAGS=""
$(soletta_target) $(soletta_config): private export PYTHON=python3

$(soletta_target): $(soletta_config)
	@echo "Building Soletta..."
	@$(MAKE) -C $(thisdir)

# If there's a SOL_CONF set, we need to merge it with the generated configuration,
# otherwise, just use alldefconfig.
ifneq (,$(SOLETTA_CONF))
$(soletta_config): $(SOLETTA_CONF)
	@echo "Configuring Soletta..."
	@$(MAKE) -C $(thisdir) alldefconfig
	@echo "Merging user configuration..."
	@cd $(thisdir) && \
		tools/kconfig/merge_config.sh .config $(SOLETTA_CONF)
else
$(soletta_config):
	@echo "Configuring Soletta..."
	@$(MAKE) -C $(thisdir) alldefconfig
endif