#!/bin/sh
#
#   ========================================================================
#   FILE:           ld_so_aix
#   TYPE:           executable, uses makexp_aix
#   SYSTEM:         AIX
#
#   DESCRIPTION:    Creates a shareable .o from a set of pre-compiled 
#                   (unshared) .o files
#
#   USAGE:          ld_so_aix [CC] [arguments]
#
#   ARGUMENTS:      Same as for "ld". The following arguments are processed
#                   or supplied by this script (those marked with an asterisk
#                   can be overriden from command line):
#
#                       Argument                     Default value
#                   (*) -o [OutputFileName]          -o shr.o
#                   (*) -e [EntryPointLabel]         -e init[OutputBaseName]
#                   (*) -bE:[ExportFile]             -bE:[OutputBaseName].exp
#                   (*) -bI:[ImportFile]             -bI:./python.exp
#                       -bM:[ModuleType]             -bM:SRE
#                       -T[Number]                   -T512
#                       -H[Number]                   -H512
#                       -lm
#
#                   The compiler specific ("-lc" or "-lc_r", "-lpthreads",...)
#                   arguments will be automatically passed to "ld" according
#                   to the CC command provided as a first argument to this
#                   script. Usually, the same CC command was used to produce
#                   the pre-compiled .o file(s).
#
#   NOTES:          1.  Since "ld_so_aix" was originally written for building
#                       shared modules for the Python interpreter, the -e and
#                       -bI default values match Python's conventions. In
#                       Python, the entry point for a shared module is based
#                       on the module's name (e.g., the "mathmodule" will
#                       expect an  entry point of "initmath").
#                   2.  The script accepts multiple .o or .a input files and
#                       creates a single (shared) output file. The export list
#                       that is created is based on the output file's basename
#                       with the suffix ".exp".
#                   3.  The resulting shared object file is left in the
#                       current directory.
#                   4.  Uncommenting the "echo" lines gives detailed output
#                       about the commands executed in the script.
#
#                       
#   HISTORY:        Oct-1996    -- Support added for multiple .o files --
#                               -- and optional arguments processing.  --
#                   Chris Myers (myers@tc.cornell.edu), Keith Kwok
#                   (kkwok@tc.cornell.edu) and Vladimir Marangozov
#
#                   Aug-6-1996  -- Take care of the compiler specific  --
#                               -- args by leaving CC to invoke "ld".  --
#                   Vladimir Marangozov
#
#                   Jul-1-1996  -- Make sure to use /usr/ccs/bin/ld    --
#                               -- Use makexp_aix for the export list. --
#                   Vladimir Marangozov     (Vladimir.Marangozov@imag.fr)
#
#                   Manus Hand (mhand@csn.net) -- Initial code -- 6/24/96
#   ========================================================================
#

usage="Usage: ld_so_aix [CC command] [ld arguments]"
if test ! -n "$*"; then
  echo $usage; exit 2
fi

# Check for existence of compiler.
CC=$1; shift
whichcc=`which $CC`

if test ! -x "$whichcc"; then
  echo "ld_so_aix: Compiler '$CC' not found; exiting."
  exit 2
fi

if test ! -n "$*"; then
  echo $usage; exit 2
fi

# Default import file for Python
# Can be overriden by providing a -bI: argument.
impfile="./python.exp"

# Parse arguments
while test -n "$1"
do
  case "$1" in
    -e | -Wl,-e)
        if test -z "$2"; then
	  echo "ld_so_aix: The -e flag needs a parameter; exiting."; exit 2
	else
	  shift; entry=$1
	fi
	;;
    -e* | -Wl,-e*)
	entry=`echo $1 | sed -e "s/-Wl,//" -e "s/-e//"`
	;;
    -o)
	if test -z "$2"; then
	  echo "ld_so_aix: The -o flag needs a parameter; exiting."; exit 2
	else
	  shift; objfile=$1
	fi
	;;
    -o*)
	objfile=`echo $1 | sed "s/-o//"`
	;;
    -bI:* | -Wl,-bI:*)
	impfile=`echo $1 | sed -e "s/-Wl,//" -e "s/-bI://"`
	;;
    -bE:* | -Wl,-bE:*)
	expfile=`echo $1 | sed -e "s/-Wl,//" -e "s/-bE://"`
	;;
    *.o | *.a)
	objs="$objs $1"
	args="$args $1"
	;;
    -bM:* | -Wl,-bM:* | -H* | -Wl,-H* | -T* | -Wl,-T* | -lm)
	;;
    *)
        args="$args $1"
	;;
  esac
  shift
done


if test -z "$objs"; then
  echo "ld_so_aix: No input files; exiting."
  exit 2
elif test ! -r "$impfile"; then
  echo "ld_so_aix: Import file '$impfile' not found or not readable; exiting."
  exit 2
fi

# If -o wasn't specified, assume "-o shr.o"
if test -z "$objfile"; then
  objfile=shr.o
fi

filename=`basename $objfile | sed "s/\.[^.]*$//"`

# If -bE: wasn't specified, assume "-bE:$filename.exp"
if test -z "$expfile"; then
  expfile="$filename.exp"
fi

# Default entry symbol for Python modules = init[modulename]
# Can be overriden by providing a -e argument.
if test -z "$entry"; then
  entry=init`echo $filename | sed "s/module.*//"`
fi

#echo "ld_so_aix: Debug info section
#echo "  -> output file : $objfile"
#echo "  -> import file : $impfile"
#echo "  -> export file : $expfile"
#echo "  -> entry point : $entry"
#echo "  -> object files: $objs"
#echo "  -> CC arguments: $args"

CCOPT="-Wl,-e$entry -Wl,-bE:$expfile -Wl,-bI:$impfile"
CCOPT="$CCOPT -Wl,-bM:SRE -Wl,-T512 -Wl,-H512 -lm -o $objfile"
CCARGS="$args"

# Export list generation.
#echo makexp_aix $expfile "$objfile" $objs
makexp_aix $expfile "$objfile" $objs

# Perform the link.
#echo $CC $CCOPT $CCARGS
$CC $CCOPT $CCARGS

# Delete the module's export list file.
# Comment this line if you need it.
rm -f $expfile