include $(__nmk_dir)utils.mk
include $(__nmk_dir)msg.mk
include scripts/feature-tests.mak

ifeq ($(call try-cc,$(FEATURE_TEST_LIBBSD_DEV),-lbsd),true)
        LIBS_FEATURES	+= -lbsd
        FEATURE_DEFINES	+= -DCONFIG_HAS_LIBBSD
else
        $(info Note: Building without setproctitle() and strlcpy() support.)
        $(info $(info)      To enable these features, please install libbsd-devel (RPM) / libbsd-dev (DEB).)
endif

ifeq ($(call pkg-config-check,libselinux),y)
        LIBS_FEATURES	+= -lselinux
        FEATURE_DEFINES	+= -DCONFIG_HAS_SELINUX
endif

ifeq ($(call pkg-config-check,libbpf),y)
        LIBS_FEATURES	+= -lbpf
        FEATURE_DEFINES	+= -DCONFIG_HAS_LIBBPF
        export CONFIG_HAS_LIBBPF := y
endif

ifeq ($(call pkg-config-check,libdrm),y)
        export CONFIG_AMDGPU := y
        $(info Note: Building criu with amdgpu_plugin.)
else
        $(info Note: Building criu without amdgpu_plugin.)
        $(info Note: libdrm and libdrm_amdgpu are required to build amdgpu_plugin.)
endif

ifeq ($(NO_GNUTLS)x$(call pkg-config-check,gnutls),xy)
        LIBS_FEATURES	+= -lgnutls
        export CONFIG_GNUTLS := y
        FEATURE_DEFINES	+= -DCONFIG_GNUTLS
else
        $(info Note: Building without GnuTLS support)
endif

ifeq ($(call pkg-config-check,libnftables),y)
        LIB_NFTABLES	:= $(shell $(PKG_CONFIG) --libs libnftables)
        ifeq ($(call try-cc,$(FEATURE_TEST_NFTABLES_LIB_API_0),$(LIB_NFTABLES)),true)
                LIBS_FEATURES	+= $(LIB_NFTABLES)
                FEATURE_DEFINES	+= -DCONFIG_HAS_NFTABLES_LIB_API_0
        else ifeq ($(call try-cc,$(FEATURE_TEST_NFTABLES_LIB_API_1),$(LIB_NFTABLES)),true)
                LIBS_FEATURES	+= $(LIB_NFTABLES)
                FEATURE_DEFINES	+= -DCONFIG_HAS_NFTABLES_LIB_API_1
        else
                $(warning Warn: you have libnftables installed but it has incompatible API)
                $(warning Warn: Building without nftables support)
        endif
else
        $(warning Warn: you have no libnftables installed)
        $(warning Warn: Building without nftables support)
endif

export LIBS += $(LIBS_FEATURES)

CONFIG_FILE = .config

$(CONFIG_FILE):
	touch $(CONFIG_FILE)

ifeq ($(ARCH),x86)
# CONFIG_COMPAT is only for x86 now, no need for compile-test other archs
ifeq ($(call try-asm,$(FEATURE_TEST_X86_COMPAT)),true)
        export CONFIG_COMPAT := y
        FEATURE_DEFINES	+= -DCONFIG_COMPAT
else
        $(info Note: Building without ia32 C/R, missed ia32 support in gcc)
        $(info $(info)      That may be related to missing gcc-multilib in your)
        $(info $(info)      distribution or you may have Debian with buggy toolchain)
        $(info $(info)      (issue https://github.com/checkpoint-restore/criu/issues/315))
endif
endif

export DEFINES += $(FEATURE_DEFINES)
export CFLAGS += $(FEATURE_DEFINES)

FEATURES_LIST	:= TCP_REPAIR STRLCPY STRLCAT PTRACE_PEEKSIGINFO \
	SETPROCTITLE_INIT MEMFD TCP_REPAIR_WINDOW MEMFD_CREATE \
	OPENAT2 NO_LIBC_RSEQ_DEFS

# $1 - config name
define gen-feature-test
ifeq ($$(call try-cc,$$(FEATURE_TEST_$(1)),$$(LIBS_FEATURES),$$(DEFINES)),true)
	$(Q) echo '#define CONFIG_HAS_$(1)' >> $$@
	$(Q) echo '' >> $$@
endif
endef

define config-header-rule
$(CONFIG_HEADER): scripts/feature-tests.mak $(CONFIG_FILE)
	$(call msg-gen, $$@)
	$(Q) echo '#ifndef __CR_CONFIG_H__'				> $$@
	$(Q) echo '#define __CR_CONFIG_H__'				>> $$@
	$(Q) echo ''							>> $$@
$(call map,gen-feature-test,$(FEATURES_LIST))
	$(Q) cat $(CONFIG_FILE) | sed -n -e '/^[^#]/s/^/#define CONFIG_/p' >> $$@
	$(Q) echo '#endif /* __CR_CONFIG_H__ */'			>> $$@
endef

$(eval $(config-header-rule))