blob: 564db3542ec206b79723510939cb473302e5eb6e
1 | #!/bin/sh |
2 | |
3 | # Script to create/update include/generated/autoksyms.h and dependency files |
4 | # |
5 | # Copyright: (C) 2016 Linaro Limited |
6 | # Created by: Nicolas Pitre, January 2016 |
7 | # |
8 | # This program is free software; you can redistribute it and/or modify |
9 | # it under the terms of the GNU General Public License version 2 as |
10 | # published by the Free Software Foundation. |
11 | |
12 | # Create/update the include/generated/autoksyms.h file from the list |
13 | # of all module's needed symbols as recorded on the third line of |
14 | # .tmp_versions/*.mod files. |
15 | # |
16 | # For each symbol being added or removed, the corresponding dependency |
17 | # file's timestamp is updated to force a rebuild of the affected source |
18 | # file. All arguments passed to this script are assumed to be a command |
19 | # to be exec'd to trigger a rebuild of those files. |
20 | |
21 | set -e |
22 | |
23 | cur_ksyms_file="include/generated/autoksyms.h" |
24 | new_ksyms_file="include/generated/autoksyms.h.tmpnew" |
25 | |
26 | info() { |
27 | if [ "$quiet" != "silent_" ]; then |
28 | printf " %-7s %s\n" "$1" "$2" |
29 | fi |
30 | } |
31 | |
32 | info "CHK" "$cur_ksyms_file" |
33 | |
34 | # Use "make V=1" to debug this script. |
35 | case "$KBUILD_VERBOSE" in |
36 | *1*) |
37 | set -x |
38 | ;; |
39 | esac |
40 | |
41 | # We need access to CONFIG_ symbols |
42 | case "${KCONFIG_CONFIG}" in |
43 | */*) |
44 | . "${KCONFIG_CONFIG}" |
45 | ;; |
46 | *) |
47 | # Force using a file from the current directory |
48 | . "./${KCONFIG_CONFIG}" |
49 | esac |
50 | |
51 | # In case it doesn't exist yet... |
52 | if [ -e "$cur_ksyms_file" ]; then touch "$cur_ksyms_file"; fi |
53 | |
54 | # Generate a new ksym list file with symbols needed by the current |
55 | # set of modules. |
56 | cat > "$new_ksyms_file" << EOT |
57 | /* |
58 | * Automatically generated file; DO NOT EDIT. |
59 | */ |
60 | |
61 | EOT |
62 | sed -ns -e '3{s/ /\n/g;/^$/!p;}' "$MODVERDIR"/*.mod | sort -u | |
63 | while read sym; do |
64 | if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then |
65 | sym="${sym#_}" |
66 | fi |
67 | echo "#define __KSYM_${sym} 1" |
68 | done >> "$new_ksyms_file" |
69 | |
70 | # Special case for modversions (see modpost.c) |
71 | if [ -n "$CONFIG_MODVERSIONS" ]; then |
72 | echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file" |
73 | fi |
74 | |
75 | # Extract changes between old and new list and touch corresponding |
76 | # dependency files. |
77 | changed=$( |
78 | count=0 |
79 | sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | |
80 | sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" | |
81 | while read sympath; do |
82 | if [ -z "$sympath" ]; then continue; fi |
83 | depfile="include/config/ksym/${sympath}.h" |
84 | mkdir -p "$(dirname "$depfile")" |
85 | touch "$depfile" |
86 | # Filesystems with coarse time precision may create timestamps |
87 | # equal to the one from a file that was very recently built and that |
88 | # needs to be rebuild. Let's guard against that by making sure our |
89 | # dep files are always newer than the first file we created here. |
90 | while [ ! "$depfile" -nt "$new_ksyms_file" ]; do |
91 | touch "$depfile" |
92 | done |
93 | echo $((count += 1)) |
94 | done | tail -1 ) |
95 | changed=${changed:-0} |
96 | |
97 | if [ $changed -gt 0 ]; then |
98 | # Replace the old list with tne new one |
99 | old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) |
100 | new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) |
101 | info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" |
102 | info "UPD" "$cur_ksyms_file" |
103 | mv -f "$new_ksyms_file" "$cur_ksyms_file" |
104 | # Then trigger a rebuild of affected source files |
105 | exec $@ |
106 | else |
107 | rm -f "$new_ksyms_file" |
108 | fi |
109 |