# This mimics the top-level Makefile. We do it explicitly here so that this
# Makefile can operate with or without the kbuild infrastructure.
ifneq ($(LLVM),)
ifneq ($(filter %/,$(LLVM)),)
LLVM_PREFIX := $(LLVM)
else ifneq ($(filter -%,$(LLVM)),)
LLVM_SUFFIX := $(LLVM)
endif

CLANG_TARGET_FLAGS_arm          := arm-linux-gnueabi
CLANG_TARGET_FLAGS_arm64        := aarch64-linux-gnu
CLANG_TARGET_FLAGS_hexagon      := hexagon-linux-musl
CLANG_TARGET_FLAGS_i386         := i386-linux-gnu
CLANG_TARGET_FLAGS_m68k         := m68k-linux-gnu
CLANG_TARGET_FLAGS_mips         := mipsel-linux-gnu
CLANG_TARGET_FLAGS_powerpc      := powerpc64le-linux-gnu
CLANG_TARGET_FLAGS_riscv        := riscv64-linux-gnu
CLANG_TARGET_FLAGS_s390         := s390x-linux-gnu
CLANG_TARGET_FLAGS_x86          := x86_64-linux-gnu
CLANG_TARGET_FLAGS_x86_64       := x86_64-linux-gnu
CLANG_TARGET_FLAGS              := $(CLANG_TARGET_FLAGS_$(ARCH))

ifeq ($(CROSS_COMPILE),)
ifeq ($(CLANG_TARGET_FLAGS),)
$(error Specify CROSS_COMPILE or add '--target=' option to lib.mk)
else
CLANG_FLAGS     += --target=$(CLANG_TARGET_FLAGS)
endif # CLANG_TARGET_FLAGS
else
CLANG_FLAGS     += --target=$(notdir $(CROSS_COMPILE:%-=%))
endif # CROSS_COMPILE

CC := $(LLVM_PREFIX)clang$(LLVM_SUFFIX) $(CLANG_FLAGS) -fintegrated-as
else
CC := $(CROSS_COMPILE)gcc
endif # LLVM

ifeq (0,$(MAKELEVEL))
    ifeq ($(OUTPUT),)
	OUTPUT := $(shell pwd)
	DEFAULT_INSTALL_HDR_PATH := 1
    endif
endif
selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
top_srcdir = $(selfdir)/../../..

ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
endif

ifneq ($(KBUILD_OUTPUT),)
  # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
  # expand a shell special character '~'. We use a somewhat tedious way here.
  abs_objtree := $(shell cd $(top_srcdir) && mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
  $(if $(abs_objtree),, \
    $(error failed to create output directory "$(KBUILD_OUTPUT)"))
  # $(realpath ...) resolves symlinks
  abs_objtree := $(realpath $(abs_objtree))
  KHDR_DIR := ${abs_objtree}/usr/include
else
  abs_srctree := $(shell cd $(top_srcdir) && pwd)
  KHDR_DIR := ${abs_srctree}/usr/include
endif

KHDR_INCLUDES := -isystem $(KHDR_DIR)

# The following are built by lib.mk common compile rules.
# TEST_CUSTOM_PROGS should be used by tests that require
# custom build rule and prevent common build rule use.
# TEST_PROGS are for test shell scripts.
# TEST_CUSTOM_PROGS and TEST_PROGS will be run by common run_tests
# and install targets. Common clean doesn't touch them.
TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))

all: kernel_header_files $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) \
     $(TEST_GEN_FILES)

kernel_header_files:
	@ls $(KHDR_DIR)/linux/*.h >/dev/null 2>/dev/null;                      \
	if [ $$? -ne 0 ]; then                                                 \
            RED='\033[1;31m';                                                  \
            NOCOLOR='\033[0m';                                                 \
            echo;                                                              \
            echo -e "$${RED}error$${NOCOLOR}: missing kernel header files.";   \
            echo "Please run this and try again:";                             \
            echo;                                                              \
            echo "    cd $(top_srcdir)";                                       \
            echo "    make headers";                                           \
            echo;                                                              \
	    exit 1; \
	fi

.PHONY: kernel_header_files

define RUN_TESTS
	BASE_DIR="$(selfdir)";			\
	. $(selfdir)/kselftest/runner.sh;	\
	if [ "X$(summary)" != "X" ]; then       \
		per_test_logging=1;		\
	fi;                                     \
	run_many $(1)
endef

run_tests: all
ifdef building_out_of_srctree
	@if [ "X$(TEST_PROGS)$(TEST_PROGS_EXTENDED)$(TEST_FILES)" != "X" ]; then \
		rsync -aLq $(TEST_PROGS) $(TEST_PROGS_EXTENDED) $(TEST_FILES) $(OUTPUT); \
	fi
	@if [ "X$(TEST_PROGS)" != "X" ]; then \
		$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) \
				  $(addprefix $(OUTPUT)/,$(TEST_PROGS))) ; \
	else \
		$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS)); \
	fi
else
	@$(call RUN_TESTS, $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) $(TEST_PROGS))
endif

define INSTALL_SINGLE_RULE
	$(if $(INSTALL_LIST),@mkdir -p $(INSTALL_PATH))
	$(if $(INSTALL_LIST),rsync -aL $(INSTALL_LIST) $(INSTALL_PATH)/)
endef

define INSTALL_RULE
	$(eval INSTALL_LIST = $(TEST_PROGS)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_PROGS_EXTENDED)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_FILES)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_GEN_PROGS)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_CUSTOM_PROGS)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_GEN_PROGS_EXTENDED)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(TEST_GEN_FILES)) $(INSTALL_SINGLE_RULE)
	$(eval INSTALL_LIST = $(wildcard config settings)) $(INSTALL_SINGLE_RULE)
endef

install: all
ifdef INSTALL_PATH
	$(INSTALL_RULE)
else
	$(error Error: set INSTALL_PATH to use install)
endif

emit_tests:
	for TEST in $(TEST_GEN_PROGS) $(TEST_CUSTOM_PROGS) $(TEST_PROGS); do \
		BASENAME_TEST=`basename $$TEST`;	\
		echo "$(COLLECTION):$$BASENAME_TEST";	\
	done

# define if isn't already. It is undefined in make O= case.
ifeq ($(RM),)
RM := rm -f
endif

define CLEAN
	$(RM) -r $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES) $(EXTRA_CLEAN)
endef

clean:
	$(CLEAN)

# Enables to extend CFLAGS and LDFLAGS from command line, e.g.
# make USERCFLAGS=-Werror USERLDFLAGS=-static
CFLAGS += $(USERCFLAGS)
LDFLAGS += $(USERLDFLAGS)

# When make O= with kselftest target from main level
# the following aren't defined.
#
ifdef building_out_of_srctree
LINK.c = $(CC) $(CFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
COMPILE.S = $(CC) $(ASFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c
LINK.S = $(CC) $(ASFLAGS) $(CPPFLAGS) $(LDFLAGS) $(TARGET_ARCH)
endif

# Selftest makefiles can override those targets by setting
# OVERRIDE_TARGETS = 1.
ifeq ($(OVERRIDE_TARGETS),)
LOCAL_HDRS += $(selfdir)/kselftest_harness.h $(selfdir)/kselftest.h
$(OUTPUT)/%:%.c $(LOCAL_HDRS)
	$(LINK.c) $(filter-out $(LOCAL_HDRS),$^) $(LDLIBS) -o $@

$(OUTPUT)/%.o:%.S
	$(COMPILE.S) $^ -o $@

$(OUTPUT)/%:%.S
	$(LINK.S) $^ $(LDLIBS) -o $@
endif

.PHONY: run_tests all clean install emit_tests