genconfig.sh revision a913d92bad6550e005a3ffac71a82586042171b5 
1#!/bin/bash
2
3# This has to be a separate file from scripts/make.sh so it can be called
4# before menuconfig.  (It's called again from scripts/make.sh just to be sure.)
5
6mkdir -p generated
7
8source configure
9
10probecc()
11{
12  ${CROSS_COMPILE}${CC} $CFLAGS -xc -o /dev/null $1 -
13}
14
15# Probe for a single config symbol with a "compiles or not" test.
16# Symbol name is first argument, flags second, feed C file to stdin
17probesymbol()
18{
19  probecc $2 2>/dev/null && DEFAULT=y || DEFAULT=n
20  rm a.out 2>/dev/null
21  echo -e "config $1\n\tbool" || exit 1
22  echo -e "\tdefault $DEFAULT\n" || exit 1
23}
24
25probeconfig()
26{
27  > generated/cflags
28  # llvm produces its own really stupid warnings about things that aren't wrong,
29  # and although you can turn the warning off, gcc reacts badly to command line
30  # arguments it doesn't understand. So probe.
31  [ -z "$(probecc -Wno-string-plus-int <<< \#warn warn 2>&1 | grep string-plus-int)" ] &&
32    echo -Wno-string-plus-int >> generated/cflags
33
34  # Probe for container support on target
35  probesymbol TOYBOX_CONTAINER << EOF
36    #include <linux/sched.h>
37    int x=CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWNET;
38
39    int main(int argc, char *argv[]) { return unshare(x); }
40EOF
41
42  probesymbol TOYBOX_FIFREEZE -c << EOF
43    #include <linux/fs.h>
44    #ifndef FIFREEZE
45    #error nope
46    #endif
47EOF
48
49  # Work around some uClibc limitations
50  probesymbol TOYBOX_ICONV -c << EOF
51    #include "iconv.h"
52EOF
53  probesymbol TOYBOX_FALLOCATE << EOF
54    #include <fcntl.h>
55
56    int main(int argc, char *argv[]) { return posix_fallocate(0,0,0); }
57EOF
58  
59  # Android and some other platforms miss utmpx
60  probesymbol TOYBOX_UTMPX -c << EOF
61    #include <utmpx.h>
62    #ifndef BOOT_TIME
63    #error nope
64    #endif
65    int main(int argc, char *argv[]) {
66      struct utmpx *a; 
67      if (0 != (a = getutxent())) return 0;
68      return 1;
69    }
70EOF
71
72  # Android is missing shadow.h
73  probesymbol TOYBOX_SHADOW -c << EOF
74    #include <shadow.h>
75    int main(int argc, char *argv[]) {
76      struct spwd *a = getspnam("root"); return 0;
77    }
78EOF
79
80  # Some commands are android-specific
81  probesymbol TOYBOX_ON_ANDROID -c << EOF
82    #ifndef __ANDROID__
83    #error nope
84    #endif
85EOF
86}
87
88genconfig()
89{
90  # Reverse sort puts posix first, examples last.
91  for j in $(ls toys/*/README | sort -r)
92  do
93    DIR="$(dirname "$j")"
94
95    [ $(ls "$DIR" | wc -l) -lt 2 ] && continue
96
97    echo "menu \"$(head -n 1 $j)\""
98    echo
99
100    # extract config stanzas from each source file, in alphabetical order
101    for i in $(ls -1 $DIR/*.c)
102    do
103      # Grab the config block for Config.in
104      echo "# $i"
105      sed -n '/^\*\//q;/^config [A-Z]/,$p' $i || return 1
106      echo
107    done
108
109    echo endmenu
110  done
111}
112
113probeconfig > generated/Config.probed || rm generated/Config.probed
114genconfig > generated/Config.in || rm generated/Config.in
115