1 files changed, 113 insertions, 0 deletions
diff --git a/tools/include/nolibc/Makefile b/tools/include/nolibc/Makefile
new file mode 100644
index 000000000000..8118e22844f1
--- /dev/null
+++ b/tools/include/nolibc/Makefile
@@ -0,0 +1,113 @@
+# 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_files := arch.h $(wildcard arch-*.h)
+all_files := \
+		compiler.h \
+		crt.h \
+		ctype.h \
+		dirent.h \
+		elf.h \
+		errno.h \
+		fcntl.h \
+		getopt.h \
+		inttypes.h \
+		limits.h \
+		math.h \
+		nolibc.h \
+		poll.h \
+		sched.h \
+		signal.h \
+		stackprotector.h \
+		std.h \
+		stdarg.h \
+		stdbool.h \
+		stddef.h \
+		stdint.h \
+		stdlib.h \
+		string.h \
+		sys.h \
+		sys/auxv.h \
+		sys/ioctl.h \
+		sys/mman.h \
+		sys/mount.h \
+		sys/prctl.h \
+		sys/random.h \
+		sys/reboot.h \
+		sys/resource.h \
+		sys/select.h \
+		sys/stat.h \
+		sys/syscall.h \
+		sys/sysmacros.h \
+		sys/time.h \
+		sys/timerfd.h \
+		sys/types.h \
+		sys/uio.h \
+		sys/utsname.h \
+		sys/wait.h \
+		time.h \
+		types.h \
+		unistd.h \
+		stdio.h \
+
+
+# install all headers needed to support a bare-metal compiler
+all: headers
+
+install: help
+
+help:
+	@echo "Supported targets under nolibc:"
+	@echo "  all                 call \"headers\""
+	@echo "  clean               clean the sysroot"
+	@echo "  headers             prepare a multi-arch sysroot in \$${OUTPUT}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 ""
+
+# installs headers for all archs at once.
+headers:
+	$(Q)mkdir -p "$(OUTPUT)sysroot"
+	$(Q)mkdir -p "$(OUTPUT)sysroot/include"
+	$(Q)cp --parents $(arch_files) $(all_files) "$(OUTPUT)sysroot/include/"
+
+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"