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

# This is a kludge for $(info ...) to not eat spaces.
S :=

ifeq ($(call try-cc,$(FEATURE_TEST_LIBBSD_DEV),-lbsd),true)
        LIBS_FEATURES	+= -lbsd
        FEATURE_DEFINES	+= -DCONFIG_HAS_LIBBSD
else
        $(info Note: Building without setproctitle() support.)
        $(info $S      Install libbsd-devel (RPM) / libbsd-dev (DEB) to fix.)
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 with amdgpu_plugin.)
else
        $(info Note: Building without amdgpu_plugin.)
        $(info $S      Install libdrm-devel (RPM) or libdrm-dev (DEB) to fix.)
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.)
        $(info $S      Install gnutls-devel (RPM) or gnutls-dev (DEB) to fix.)
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
                $(info Warn: Building without nftables support (incompatible API version).)
        endif
else
        $(info Warn: Building without nftables support.)
        $(info $S      Install nftables-devel (RPM) or libnftables-dev (DEB) to fix.)
endif

export LIBS += $(LIBS_FEATURES)

ifneq ($(PLUGINDIR),)
                FEATURE_DEFINES	+= -DCR_PLUGIN_DEFAULT="\"$(PLUGINDIR)\""
endif

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, missing ia32 support in gcc.)
        $(info $S      It may be related to missing gcc-multilib in your)
        $(info $S      distribution, or you may have Debian with buggy toolchain.)
        $(info $S      See https://github.com/checkpoint-restore/criu/issues/315.)
endif
endif

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

FEATURES_LIST	:= TCP_REPAIR PTRACE_PEEKSIGINFO \
	SETPROCTITLE_INIT 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)' >> $$@
else
	$(Q) echo '// CONFIG_HAS_$(1) is not set' >> $$@
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))