support/cppmagic

   1 #!/bin/sh
   2 # Return a full cpp specification, complete with system dependent flags.
   3 #
   4 # Syntax: cppmagic [ program-to-generate-flags [ guessed-cpp ]]
   5 #
   6 # If only one arg is present it is the name of a program to invoke
   7 # which should generate -Dfoo defines.
   8 #
   9 # If two args are present the second arg is the name of the C
  10 # preprocessor to use.
  11 #
  12 # Invoked with no args, provides a C preprocessor name and
  13 # -traditional flag if that is appropriate.
  14 #
  15 #  ../Makefile calls this file thusly: "cppmagic getcppsyms".
  16 #
  17 #  Typical output:
  18 #
  19 #    /lib/cpp -Dunix -Dm68k
  20 #
  21
  22 Cpp=
  23
  24 if [ "$2" ]; then
  25    Cpp=$2
  26 else
  27    for cpp in /lib/cpp /usr/lib/cpp /usr/ccs/lib/cpp; do
  28       if [ -f $cpp ]; then
  29          Cpp=$cpp
  30       fi
  31    done
  32    if [ "$Cpp" = "" ]; then
  33       Cpp=cpp
  34    fi
  35 fi
  36
  37 TRADITIONAL=
  38 FLAGS=
  39
  40 # First flag might be `-traditional' if this is Gnu Cpp.
  41 unknown_flag=`$Cpp -traditional /dev/null 2>&1 |
  42                 egrep 'known|recognized|valid|bad|legal'`
  43 if [ "$unknown_flag" = "" ]; then
  44   TRADITIONAL=-traditional
  45 fi
  46
  47 if [ "$1" ]; then
  48    FLAGS=`$1`
  49 fi
  50
  51 echo $Cpp $TRADITIONAL $FLAGS