scripts/gen_build_files.sh

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