1#!/bin/sh
2
3# If not specified in environment...
4if ! test "$LIBC"; then
5	# Select which libc to build against
6	LIBC="glibc"
7	LIBC="uclibc"
8fi
9# x86 32-bit:
10#CROSS_COMPILER_PREFIX="i486-linux-uclibc-"
11# My system has strange prefix for x86 64-bit uclibc:
12#CROSS_COMPILER_PREFIX="x86_64-pc-linux-gnu-"
13
14if test $# -lt 2 || ! test -d "$1" || test -e "$2"; then
15	echo "Usage: $0 SRC_DIR TMP_DIR"
16	echo
17	echo "SRC_DIR will be copied to TMP_DIR directory."
18	echo "Then a random build will be performed."
19	echo
20	echo "Useful variables:"
21	echo "\$LIBC, \$CROSS_COMPILER_PREFIX, \$MAKEOPTS"
22	exit 1
23fi
24
25cp -dpr -- "$1" "$2" || { echo "copy error"; exit 1; }
26cd -- "$2" || { echo "cd $dir error"; exit 1; }
27
28# Generate random config
29make randconfig >/dev/null || { echo "randconfig error"; exit 1; }
30
31# Tweak resulting config
32cat .config \
33| grep -v CONFIG_DEBUG_PESSIMIZE \
34| grep -v CONFIG_WERROR \
35| grep -v CONFIG_CROSS_COMPILER_PREFIX \
36| grep -v CONFIG_SELINUX \
37| grep -v CONFIG_EFENCE \
38| grep -v CONFIG_DMALLOC \
39\
40| grep -v CONFIG_RFKILL \
41>.config.new
42mv .config.new .config
43echo '# CONFIG_DEBUG_PESSIMIZE is not set' >>.config
44echo '# CONFIG_WERROR is not set' >>.config
45echo "CONFIG_CROSS_COMPILER_PREFIX=\"${CROSS_COMPILER_PREFIX}\"" >>.config
46echo '# CONFIG_SELINUX is not set' >>.config
47echo '# CONFIG_EFENCE is not set' >>.config
48echo '# CONFIG_DMALLOC is not set' >>.config
49echo '# CONFIG_RFKILL is not set' >>.config
50
51# If glibc, don't build static
52if test x"$LIBC" = x"glibc"; then
53	cat .config \
54	| grep -v CONFIG_STATIC \
55	| grep -v CONFIG_FEATURE_LIBBUSYBOX_STATIC \
56	\
57	| grep -v CONFIG_FEATURE_2_4_MODULES \
58	| grep -v CONFIG_FEATURE_USE_BSS_TAIL \
59	| grep -v CONFIG_DEBUG_SANITIZE \
60	| grep -v CONFIG_FEATURE_MOUNT_NFS \
61	| grep -v CONFIG_FEATURE_INETD_RPC \
62	>.config.new
63	mv .config.new .config
64	echo '# CONFIG_STATIC is not set' >>.config
65	echo '# CONFIG_FEATURE_LIBBUSYBOX_STATIC is not set' >>.config
66	# newer glibc (at least 2.23) no longer supply query_module() ABI.
67	# People who target 2.4 kernels would likely use older glibc (and older bbox).
68	echo '# CONFIG_FEATURE_2_4_MODULES is not set' >>.config
69	echo '# CONFIG_FEATURE_USE_BSS_TAIL is not set' >>.config
70	echo '# CONFIG_DEBUG_SANITIZE is not set' >>.config
71	# 2018: current glibc versions no longer include rpc/rpc.h
72	echo '# CONFIG_FEATURE_MOUNT_NFS is not set' >>.config
73	echo '# CONFIG_FEATURE_INETD_RPC is not set' >>.config
74fi
75
76# If uclibc, build static, and remove some things
77# likely to not work on uclibc.
78if test x"$LIBC" = x"uclibc"; then
79	cat .config \
80	| grep -v CONFIG_STATIC \
81	| grep -v CONFIG_BUILD_LIBBUSYBOX \
82	| grep -v CONFIG_PIE \
83	\
84	| grep -v CONFIG_FEATURE_2_4_MODULES \
85	| grep -v CONFIG_FEATURE_SYNC_FANCY \
86	| grep -v CONFIG_NANDWRITE \
87	| grep -v CONFIG_NANDDUMP \
88	| grep -v CONFIG_BLKDISCARD \
89	| grep -v CONFIG_NSENTER \
90	| grep -v CONFIG_UNSHARE \
91	| grep -v CONFIG_FALLOCATE \
92	| grep -v CONFIG_UDHCPC6 \
93	| grep -v CONFIG_NSLOOKUP \
94	| grep -v CONFIG_ASH_INTERNAL_GLOB \
95	>.config.new
96	mv .config.new .config
97	echo 'CONFIG_STATIC=y' >>.config
98	echo '# CONFIG_BUILD_LIBBUSYBOX is not set' >>.config
99	echo '# CONFIG_PIE is not set' >>.config
100	echo '# CONFIG_FEATURE_2_4_MODULES is not set' >>.config
101	echo '# CONFIG_FEATURE_SYNC_FANCY is not set' >>.config
102	# My uclibc installation does not support some needed APIs...
103	echo '# CONFIG_NANDWRITE is not set' >>.config
104	echo '# CONFIG_NANDDUMP is not set' >>.config
105	echo '# CONFIG_BLKDISCARD is not set' >>.config
106	echo '# CONFIG_NSENTER is not set' >>.config
107	echo '# CONFIG_UNSHARE is not set' >>.config
108	echo '# CONFIG_FALLOCATE is not set' >>.config
109	echo '# CONFIG_UDHCPC6 is not set' >>.config
110	echo '# CONFIG_NSLOOKUP is not set' >>.config
111	echo 'CONFIG_ASH_INTERNAL_GLOB=y' >>.config
112fi
113
114# If musl
115if test x"$LIBC" = x"musl"; then
116	cat .config \
117	| grep -v CONFIG_STATIC \
118	| grep -v CONFIG_DEBUG_SANITIZE \
119	| grep -v CONFIG_LFS \
120	| grep -v CONFIG_EXTRA_COMPAT \
121	| grep -v CONFIG_FEATURE_2_4_MODULES \
122	| grep -v CONFIG_FEATURE_VI_REGEX_SEARCH \
123	| grep -v CONFIG_FEATURE_MOUNT_NFS \
124	| grep -v CONFIG_FEATURE_INETD_RPC \
125	>.config.new
126	mv .config.new .config
127	echo 'CONFIG_STATIC=y' >>.config
128	# "error: cannot specify -static with -fsanitize=address":
129	echo '# CONFIG_DEBUG_SANITIZE is not set' >>.config
130	# with LFS off, uoff_t will have wrong width:
131	echo 'CONFIG_LFS=y' >>.config
132	echo '# CONFIG_EXTRA_COMPAT is not set' >>.config
133	echo '# CONFIG_FEATURE_2_4_MODULES is not set' >>.config
134	echo '# CONFIG_FEATURE_VI_REGEX_SEARCH is not set' >>.config
135	echo '# CONFIG_FEATURE_MOUNT_NFS is not set' >>.config
136	echo '# CONFIG_FEATURE_INETD_RPC is not set' >>.config
137fi
138
139# If STATIC, remove some things.
140# PAM with static linking is probably pointless
141# (but I need to try - now I don't have libpam.a on my system, only libpam.so)
142if grep -q "^CONFIG_STATIC=y" .config; then
143	cat .config \
144	| grep -v CONFIG_PAM \
145	>.config.new
146	mv .config.new .config
147	echo '# CONFIG_PAM is not set' >>.config
148fi
149
150# Regenerate .config with default answers for yanked-off options
151# (most of default answers are "no").
152{ yes "" | make oldconfig >/dev/null; } || { echo "oldconfig error"; exit 1; }
153
154# Build!
155nice -n 10 make $MAKEOPTS 2>&1 | tee make.log
156grep 'Rerun make' make.log \
157&& nice -n 10 make $MAKEOPTS 2>&1 | tee -a make.log
158
159# Return exitcode 1 if busybox executable does not exist
160test -x busybox
161