libstdc++-v3/mkinclosure

   1 #!/usr/bin/env bash
   2 #
   3 # usage: inclosure [ -I dir ] ... [ -G header-name ] ... header-name ...
   4 #
   5 # Locates each standard header and argument header-name in the
   6 # specified "-I" include path (default is /usr/include) and parses
   7 # any header names out of its #include directives.  These names are
   8 # treated recursively to identify a _transitive_closure_ of standard
   9 # header names, which is sorted and sent to standard output.  Headers
  10 # not specified with -G, and included somewhere but not located are
  11 # reported.
  12 #
  13 # Each header reported by this program must be "shadowed" by a
  14 # file of the same name in a C++ header.  See
  15 #   http://www.cantrip.org/cheaders.html
  16 #
  17 # BUGS:
  18 #  - Cannot cope with header file names that contain spaces
  19 #  - Ignores comment-block delimiters
  20 #  - Ignores sub-includes under #include_next headers.
  21
  22 OLDH=/tmp/old$$
  23 echo "this-compensates-for-a-stupid-bug-in-GNU-fgrep." >$OLDH
  24 HDRS=/tmp/hdrs$$
  25 >$HDRS
  26 NEW=/tmp/new$$
  27 >$NEW
  28 IGNORES=/tmp/ignores$$
  29 echo "this-compensates-for-a-stupid-bug-in-GNU-fgrep.">$IGNORES
  30
  31 trap "rm -f $NEW $HDRS $OLDH $IGNORES" 0
  32
  33 # process arguments
  34 unset INCPATH
  35 while [ $# != 0 -a "$1" != "${1#-}" ]; do
  36   FLAG="${1%%${1##-?}}"
  37   case "$FLAG" in -I|-G)
  38     ARG="${1##${FLAG}}"
  39     if [ "$ARG" = "" ]; then
  40       if [ $# != 0 ]; then
  41         shift;
  42         ARG="$1"
  43       else
  44         echo "$0: $FLAG needs an argument."
  45         exit
  46       fi
  47     fi ;;
  48   esac
  49   shift
  50   case "$FLAG" in
  51     -I) INCPATH="$INCPATH $ARG" ;;
  52     -G) echo " $ARG " >>$IGNORES ;;
  53   esac
  54 done
  55 INCPATH=${INCPATH-"/usr/include"}
  56
  57 # identify headers
  58
  59 STDHDRS="assert.h ctype.h errno.h float.h limits.h \
  60  locale.h math.h setjmp.h signal.h stdarg.h stddef.h \
  61  stdio.h stdlib.h string.h time.h wchar.h wctype.h "
  62 OTHERS="$*"
  63
  64 for file in $STDHDRS $OTHERS; do
  65   echo "$file"
  66 done >$HDRS
  67
  68 until cmp -s $OLDH $HDRS; do #  (until no new headers found)
  69
  70   fgrep -v -f $OLDH $HDRS \
  71   | while read file; do
  72     found=no
  73     for dir in $INCPATH; do
  74       name="$dir/$file"
  75       if [ -f "$name" ]; then
  76         cat "$name"
  77         found=yes
  78         break;
  79       fi
  80     done
  81     if [ "$found" = no ]; then # && echo " $file " | fgrep -v -q -f $IGNORES
  82       echo "$0: warning: header $file not found in include path." $1>&2
  83     fi
  84   done \
  85   | sed -n -e \
  86 '/^[    ]*#[    ]*include[      ]*<[^>]*>/s/^[^<]*<\([^>]*\)>.*/\1/p' \
  87   | while read file; do
  88      drop=no
  89      for ignore in `cat $IGNORES`; do
  90        if [ "$ignore" = "$file" ]; then drop=yes; fi
  91      done
  92      case "$file" in /*) drop=yes;; esac   # no absolute paths
  93      case $drop in no) echo "$file";; esac
  94   done >$NEW
  95   mv $HDRS $OLDH
  96   cat $OLDH $NEW | sort -u -o $HDRS
  97
  98 done
  99 cat $HDRS
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