xref: /linux/tools/include/nolibc/Makefile (revision 2f804aca48322f02a8f44cca540663845ee80fb1) 
1# SPDX-License-Identifier: GPL-2.0
2# Makefile for nolibc installation and tests
3include ../../scripts/Makefile.include
4
5# we're in ".../tools/include/nolibc"
6ifeq ($(srctree),)
7srctree := $(patsubst %/tools/include/,%,$(dir $(CURDIR)))
8endif
9
10# when run as make -C tools/ nolibc_<foo> the arch is not set
11ifeq ($(ARCH),)
12include $(srctree)/scripts/subarch.include
13ARCH = $(SUBARCH)
14endif
15
16# OUTPUT is only set when run from the main makefile, otherwise
17# it defaults to this nolibc directory.
18OUTPUT ?= $(CURDIR)/
19
20ifeq ($(V),1)
21Q=
22else
23Q=@
24endif
25
26nolibc_arch := $(patsubst arm64,aarch64,$(ARCH))
27arch_file := arch-$(nolibc_arch).h
28all_files := ctype.h errno.h nolibc.h signal.h stackprotector.h std.h stdint.h \
29             stdio.h stdlib.h string.h sys.h time.h types.h unistd.h
30
31# install all headers needed to support a bare-metal compiler
32all: headers
33
34install: help
35
36help:
37	@echo "Supported targets under nolibc:"
38	@echo "  all                 call \"headers\""
39	@echo "  clean               clean the sysroot"
40	@echo "  headers             prepare a sysroot in tools/include/nolibc/sysroot"
41	@echo "  headers_standalone  like \"headers\", and also install kernel headers"
42	@echo "  help                this help"
43	@echo ""
44	@echo "These targets may also be called from tools as \"make nolibc_<target>\"."
45	@echo ""
46	@echo "Currently using the following variables:"
47	@echo "  ARCH    = $(ARCH)"
48	@echo "  OUTPUT  = $(OUTPUT)"
49	@echo ""
50
51# Note: when ARCH is "x86" we concatenate both x86_64 and i386
52headers:
53	$(Q)mkdir -p $(OUTPUT)sysroot
54	$(Q)mkdir -p $(OUTPUT)sysroot/include
55	$(Q)cp $(all_files) $(OUTPUT)sysroot/include/
56	$(Q)if [ "$(ARCH)" = "x86" ]; then      \
57		sed -e                          \
58		  's,^#ifndef _NOLIBC_ARCH_X86_64_H,#if !defined(_NOLIBC_ARCH_X86_64_H) \&\& defined(__x86_64__),' \
59		  arch-x86_64.h;                \
60		sed -e                          \
61		  's,^#ifndef _NOLIBC_ARCH_I386_H,#if !defined(_NOLIBC_ARCH_I386_H) \&\& !defined(__x86_64__),' \
62		  arch-i386.h;                  \
63	elif [ -e "$(arch_file)" ]; then        \
64		cat $(arch_file);               \
65	else                                    \
66		echo "Fatal: architecture $(ARCH) not yet supported by nolibc." >&2; \
67		exit 1;                         \
68	fi > $(OUTPUT)sysroot/include/arch.h
69
70headers_standalone: headers
71	$(Q)$(MAKE) -C $(srctree) headers
72	$(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
73
74clean:
75	$(call QUIET_CLEAN, nolibc) rm -rf "$(OUTPUT)sysroot"
76