Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 compiler.h \
30 crt.h \
31 ctype.h \
32 dirent.h \
33 elf.h \
34 errno.h \
35 fcntl.h \
36 getopt.h \
37 limits.h \
38 math.h \
39 nolibc.h \
40 poll.h \
41 sched.h \
42 signal.h \
43 stackprotector.h \
44 std.h \
45 stdarg.h \
46 stdbool.h \
47 stddef.h \
48 stdint.h \
49 stdlib.h \
50 string.h \
51 sys.h \
52 sys/auxv.h \
53 sys/ioctl.h \
54 sys/mman.h \
55 sys/mount.h \
56 sys/prctl.h \
57 sys/random.h \
58 sys/reboot.h \
59 sys/resource.h \
60 sys/stat.h \
61 sys/syscall.h \
62 sys/sysmacros.h \
63 sys/time.h \
64 sys/timerfd.h \
65 sys/types.h \
66 sys/utsname.h \
67 sys/wait.h \
68 time.h \
69 types.h \
70 unistd.h \
71 stdio.h \
72
73
74# install all headers needed to support a bare-metal compiler
75all: headers
76
77install: help
78
79help:
80 @echo "Supported targets under nolibc:"
81 @echo " all call \"headers\""
82 @echo " clean clean the sysroot"
83 @echo " headers prepare a sysroot in tools/include/nolibc/sysroot"
84 @echo " headers_standalone like \"headers\", and also install kernel headers"
85 @echo " help this help"
86 @echo ""
87 @echo "These targets may also be called from tools as \"make nolibc_<target>\"."
88 @echo ""
89 @echo "Currently using the following variables:"
90 @echo " ARCH = $(ARCH)"
91 @echo " OUTPUT = $(OUTPUT)"
92 @echo ""
93
94# Note: when ARCH is "x86" we concatenate both x86_64 and i386
95headers:
96 $(Q)mkdir -p $(OUTPUT)sysroot
97 $(Q)mkdir -p $(OUTPUT)sysroot/include
98 $(Q)cp --parents $(all_files) $(OUTPUT)sysroot/include/
99 $(Q)if [ "$(ARCH)" = "x86" ]; then \
100 sed -e \
101 's,^#ifndef _NOLIBC_ARCH_X86_64_H,#if !defined(_NOLIBC_ARCH_X86_64_H) \&\& defined(__x86_64__),' \
102 arch-x86_64.h; \
103 sed -e \
104 's,^#ifndef _NOLIBC_ARCH_I386_H,#if !defined(_NOLIBC_ARCH_I386_H) \&\& !defined(__x86_64__),' \
105 arch-i386.h; \
106 elif [ -e "$(arch_file)" ]; then \
107 cat $(arch_file); \
108 else \
109 echo "Fatal: architecture $(ARCH) not yet supported by nolibc." >&2; \
110 exit 1; \
111 fi > $(OUTPUT)sysroot/include/arch.h
112
113headers_standalone: headers
114 $(Q)$(MAKE) -C $(srctree) headers
115 $(Q)$(MAKE) -C $(srctree) headers_install INSTALL_HDR_PATH=$(OUTPUT)sysroot
116
117# GCC uses "s390", clang "systemz"
118CLANG_CROSS_FLAGS := $(subst --target=s390-linux,--target=systemz-linux,$(CLANG_CROSS_FLAGS))
119
120headers_check: headers_standalone
121 for header in $(filter-out crt.h std.h,$(all_files)); do \
122 $(CC) $(CLANG_CROSS_FLAGS) -Wall -Werror -nostdinc -fsyntax-only -x c /dev/null \
123 -I$(or $(objtree),$(srctree))/usr/include -include $$header -include $$header || exit 1; \
124 done
125
126clean:
127 $(call QUIET_CLEAN, nolibc) rm -rf "$(OUTPUT)sysroot"