xref: /linux-6.15/tools/include/nolibc/Makefile (revision e21a2eef) 
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 := \
29		ctype.h \
30		errno.h \
31		nolibc.h \
32		signal.h \
33		stackprotector.h \
34		std.h \
35		stdint.h \
36		stdlib.h \
37		string.h \
38		sys.h \
39		time.h \
40		types.h \
41		unistd.h \
42		stdio.h \
43
44
45# install all headers needed to support a bare-metal compiler
46all: headers
47
48install: help
49
50help:
51	@echo "Supported targets under nolibc:"
52	@echo "  all                 call \"headers\""
53	@echo "  clean               clean the sysroot"
54	@echo "  headers             prepare a sysroot in tools/include/nolibc/sysroot"
55	@echo "  headers_standalone  like \"headers\", and also install kernel headers"
56	@echo "  help                this help"
57	@echo ""
58	@echo "These targets may also be called from tools as \"make nolibc_<target>\"."
59	@echo ""
60	@echo "Currently using the following variables:"
61	@echo "  ARCH    = $(ARCH)"
62	@echo "  OUTPUT  = $(OUTPUT)"
63	@echo ""
64
65# Note: when ARCH is "x86" we concatenate both x86_64 and i386
66headers:
67	$(Q)mkdir -p $(OUTPUT)sysroot
68	$(Q)mkdir -p $(OUTPUT)sysroot/include
69	$(Q)cp $(all_files) $(OUTPUT)sysroot/include/
70	$(Q)if [ "$(ARCH)" = "x86" ]; then      \
71		sed -e                          \
72		  's,^#ifndef _NOLIBC_ARCH_X86_64_H,#if !defined(_NOLIBC_ARCH_X86_64_H) \&\& defined(__x86_64__),' \
73		  arch-x86_64.h;                \
74		sed -e                          \
75		  's,^#ifndef _NOLIBC_ARCH_I386_H,#if !defined(_NOLIBC_ARCH_I386_H) \&\& !defined(__x86_64__),' \
76		  arch-i386.h;                  \
77	elif [ -e "$(arch_file)" ]; then        \
78		cat $(arch_file);               \
79	else                                    \
80		echo "Fatal: architecture $(ARCH) not yet supported by nolibc." >&2; \
81		exit 1;                         \
82	fi > $(OUTPUT)sysroot/include/arch.h
83
84headers_standalone: headers
85	$(Q)$(MAKE) -C $(srctree) headers
86	$(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
87
88clean:
89	$(call QUIET_CLEAN, nolibc) rm -rf "$(OUTPUT)sysroot"
90