#!/bin/sh
# Return a full cpp specification, complete with system dependent flags.
#
# Syntax: cppmagic [ program-to-generate-flags [ guessed-cpp ]]
#
# If only one arg is present it is the name of a program to invoke
# which should generate -Dfoo defines.
#
# If two args are present the second arg is the name of the C
# preprocessor to use.
#
# Invoked with no args, provides a C preprocessor name and
# -traditional flag if that is appropriate.
#
#  ../Makefile calls this file thusly: "cppmagic getcppsyms".
#
#  Typical output:
#
#    /lib/cpp -Dunix -Dm68k
#

Cpp=

if [ "$2" ]; then
   Cpp=$2
else
   for cpp in /lib/cpp /usr/lib/cpp /usr/ccs/lib/cpp; do
      if [ -f $cpp ]; then
	 Cpp=$cpp
      fi
   done
   if [ "$Cpp" = "" ]; then
      Cpp=cpp
   fi
fi

TRADITIONAL=
FLAGS=

# First flag might be `-traditional' if this is Gnu Cpp.
unknown_flag=`$Cpp -traditional /dev/null 2>&1 |
  		egrep 'known|recognized|valid|bad|legal'`
if [ "$unknown_flag" = "" ]; then
  TRADITIONAL=-traditional
fi

if [ "$1" ]; then
   FLAGS=`$1`
fi

echo $Cpp $TRADITIONAL $FLAGS