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# SPDX-License-Identifier: GPL-2.0
# Makefile for nolibc installation and tests
include ../../scripts/Makefile.include

# we're in ".../tools/include/nolibc"
ifeq ($(srctree),)
srctree := $(patsubst %/tools/include/,%,$(dir $(CURDIR)))
endif

# when run as make -C tools/ nolibc_<foo> the arch is not set
ifeq ($(ARCH),)
include $(srctree)/scripts/subarch.include
ARCH = $(SUBARCH)
endif

# OUTPUT is only set when run from the main makefile, otherwise
# it defaults to this nolibc directory.
OUTPUT ?= $(CURDIR)/

ifeq ($(V),1)
Q=
else
Q=@
endif

arch_file := arch-$(ARCH).h
all_files := \
  compiler.h \
  crt.h \
  ctype.h \
  dirent.h \
  elf.h \
  errno.h \
  fcntl.h \
  getopt.h \
  limits.h \
  math.h \
  nolibc.h \
  poll.h \
  sched.h \
  signal.h \
  stackprotector.h \
  std.h \
  stdarg.h \
  stdbool.h \
  stddef.h \
  stdint.h \
  stdlib.h \
  string.h \
  sys.h \
  sys/auxv.h \
  sys/ioctl.h \
  sys/mman.h \
  sys/mount.h \
  sys/prctl.h \
  sys/random.h \
  sys/reboot.h \
  sys/resource.h \
  sys/stat.h \
  sys/syscall.h \
  sys/sysmacros.h \
  sys/time.h \
  sys/timerfd.h \
  sys/types.h \
  sys/utsname.h \
  sys/wait.h \
  time.h \
  types.h \
  unistd.h \
  stdio.h \


# install all headers needed to support a bare-metal compiler
all: headers

install: help

help:
 @echo "Supported targets under nolibc:"
 @echo " all call \"headers\""
 @echo " clean clean the sysroot"
 @echo " headers prepare a sysroot in tools/include/nolibc/sysroot"
 @echo " headers_standalone like \"headers\", and also install kernel headers"
 @echo " help this help"
 @echo ""
 @echo "These targets may also be called from tools as \"make nolibc_<target>\"."
 @echo ""
 @echo "Currently using the following variables:"
 @echo " ARCH = $(ARCH)"
 @echo " OUTPUT = $(OUTPUT)"
 @echo ""

headers:
 $(Q)mkdir -p $(OUTPUT)sysroot
 $(Q)mkdir -p $(OUTPUT)sysroot/include
 $(Q)cp --parents $(all_files) $(OUTPUT)sysroot/include/
 $(Q)if [ "$(ARCH)" = "i386" -o "$(ARCH)" = "x86_64" ]; then \
  cat arch-x86.h;                 \
 elif [ -e "$(arch_file)" ]; then        \
  cat $(arch_file);               \
 else                                    \
  echo "Fatal: architecture $(ARCH) not yet supported by nolibc." >&2; \
  exit 1;                         \
 fi > $(OUTPUT)sysroot/include/arch.h

headers_standalone: headers
 $(Q)$(MAKE) -C $(srctree) headers
 $(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot

headers_check: headers_standalone
 $(Q)for header in $(filter-out crt.h std.h,$(all_files)); do \
  $(CC) $(CLANG_CROSS_FLAGS) -Wall -Werror -nostdinc -fsyntax-only -x c /dev/null \
   -I$(or $(objtree),$(srctree))/usr/include -include $$header -include $$header || exit 1; \
 done

clean:
 $(call QUIET_CLEAN, nolibc) rm -rf "$(OUTPUT)sysroot"