scripts/gen_build_files.sh

   1 #!/bin/sh
   2
   3 # Note: was using sed OPTS CMD -- FILES
   4 # but users complain that many sed implementations
   5 # are misinterpreting --.
   6
   7 test $# -ge 2 || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
   8
   9 # cd to objtree
  10 cd -- "$2" || { echo "Syntax: $0 SRCTREE OBJTREE"; exit 1; }
  11 # In separate objtree build, include/ might not exist yet
  12 mkdir include 2>/dev/null
  13
  14 srctree="$1"
  15
  16 status() { printf '  %-8s%s\n' "$1" "$2"; }
  17 gen() { status "GEN" "$@"; }
  18 chk() { status "CHK" "$@"; }
  19
  20 generate()
  21 {
  22         local src="$1" dst="$2" header="$3" insert="$4"
  23         #chk "${dst}"
  24         (
  25                 # Need to use printf: different shells have inconsistent
  26                 # rules re handling of "\n" in echo params,
  27                 # and ${insert} definitely contains "\n".
  28                 # Therefore, echo "${header}" would not work:
  29                 printf "%s\n" "${header}"
  30                 if grep -qs '^INSERT$' "${src}"; then
  31                         sed -n '1,/^INSERT$/p' "${src}"
  32                         printf "%s\n" "${insert}"
  33                         sed -n '/^INSERT$/,$p' "${src}"
  34                 else
  35                         if [ -n "${insert}" ]; then
  36                                 printf "%s\n" "ERROR: INSERT line missing in: ${src}" 1>&2
  37                         fi
  38                         cat "${src}"
  39                 fi
  40         ) | sed '/^INSERT$/d' > "${dst}.tmp"
  41         if ! cmp -s "${dst}" "${dst}.tmp"; then
  42                 gen "${dst}"
  43                 mv "${dst}.tmp" "${dst}"
  44         else
  45                 rm -f "${dst}.tmp"
  46         fi
  47 }
  48
  49 # (Re)generate include/applets.h
  50 s=`sed -n 's@^//applet:@@p' "$srctree"/*/*.c "$srctree"/*/*/*.c`
  51 generate \
  52         "$srctree/include/applets.src.h" \
  53         "include/applets.h" \
  54         "/* DO NOT EDIT. This file is generated from applets.src.h */" \
  55         "${s}"
  56
  57 # (Re)generate include/usage.h
  58 # We add line continuation backslash after each line,
  59 # and insert empty line before each line which doesn't start
  60 # with space or tab
  61 # (note: we need to use \\\\ because of ``)
  62 s=`sed -n -e 's@^//usage:\([ \t].*\)$@\1 \\\\@p' -e 's@^//usage:\([^ \t].*\)$@\n\1 \\\\@p' "$srctree"/*/*.c "$srctree"/*/*/*.c`
  63 generate \
  64         "$srctree/include/usage.src.h" \
  65         "include/usage.h" \
  66         "/* DO NOT EDIT. This file is generated from usage.src.h */" \
  67         "${s}"
  68
  69 # (Re)generate */Kbuild and */Config.in
  70 { cd -- "$srctree" && find . -type d; } | while read -r d; do
  71         d="${d#./}"
  72
  73         src="$srctree/$d/Kbuild.src"
  74         dst="$d/Kbuild"
  75         if test -f "$src"; then
  76                 mkdir -p -- "$d" 2>/dev/null
  77
  78                 s=`sed -n 's@^//kbuild:@@p' "$srctree/$d"/*.c`
  79                 generate \
  80                         "${src}" "${dst}" \
  81                         "# DO NOT EDIT. This file is generated from Kbuild.src" \
  82                         "${s}"
  83         fi
  84
  85         src="$srctree/$d/Config.src"
  86         dst="$d/Config.in"
  87         if test -f "$src"; then
  88                 mkdir -p -- "$d" 2>/dev/null
  89
  90                 s=`sed -n 's@^//config:@@p' "$srctree/$d"/*.c`
  91                 generate \
  92                         "${src}" "${dst}" \
  93                         "# DO NOT EDIT. This file is generated from Config.src" \
  94                         "${s}"
  95         fi
  96 done
  97
  98 # Last read failed. This is normal. Don't exit with its error code:
  99 exit 0