#!/bin/sh

#
# This script computes the various flags needed to run GNU C++ testsuites
# (compiler specific as well as library specific).  It is based on 
# the ./mkcheck.in, which in the long will be removed in favor of a
# DejaGnu-base framework.
#
# Written by Gabriel Dos Reis <gdr@codesourcery.com>
#

#
# Synopsis
#   * tests_flags --compiler build-dir src-dir
#
#      Returns a space-separated list of flags needed to run front-end
#      specific tests.
# 
#   * tests_flags --built-library build-dir src-dir
#   * tests_flags --installed-library build-dir src-dir install-dir
#     
#      Returns a colon-separated list of space-separated list of flags,
#      needed to run library specific tests,
#      BUILD_DIR:SRC_DIR:PREFIX_DIR:LTCXX:LIBS:LTEXE:CXX:CXXFLAGS 
#      the meaning of which is as follows:
#        BUILD_DIR   build-dir
#        SRC_DIR     src-dir
#        PREFIX_DIR  install-dir (meaningful only with --installed-library)
#        LTCXX       libtoolized command to compile a C++ program
#        LIBS        flags to pass to the linker
#        LTEXE       libtoolized command to run a compiled C++ program
#	 CXX         which C++ compiler is being used
#        CXXFLAGS    special C++ flags used
#

##
## Utility functions
##

# Print a message saying how this script is intended to be invoked
print_usage() {
    cat <<EOF
Usage: 
  tests_fags --compiler <build-dir> <src-dir>
             --built-library <build-dir>  <src-dir>
             --installed-library <build-dir> <src-dir> <install-dir>
EOF
    exit 1
}

# Check for command line option
check_options() {
    # First, check for number of command line arguments
    if [ \( $1 -ne 3 \) -a \( $1 -ne 4 \) ]; then
	print_usage;
    fi
    
    # Then, see if we understand the job we're asked for
    case $2 in
	--compiler|--built-library|--installed-library)
	# OK
	;;
	*) 
	print_usage
	;;
    esac
}

# Directory sanity check
check_directory() {
    if [ ! $2 ]; then
	echo "$1 '$2' directory not found, exiting."
	exit 1
    fi
}

##
## Main processing
##

# Command line options sanity check
check_options $# $1

query=$1

# Check for build, source and install directories
BUILD_DIR=$2; SRC_DIR=$3
check_directory 'Build' ${BUILD_DIR}
check_directory 'Source' ${SRC_DIR}
case ${query} in
    --installed-library)
    PREFIX_DIR=$4
    check_directory 'Install' ${PREFIX_DIR}
    ;;
    *)
    PREFIX_DIR=
    ;;
esac

# This is LIBTOOL=@LIBTOOL@ piped through a bit of sanity that we can
# assume for this script (by the time we run this).
LIBTOOL="${BUILD_DIR}/libtool"
chmod u+x ${LIBTOOL}

# Compute include paths
# INC_PATH == include path to new headers for use on gcc command-line
top_srcdir=@top_srcdir@
C_DIR="`basename  @C_INCLUDE_DIR@`"
case ${query} in
    --installed-library)
    INC_PATH="-I${SRC_DIR}/testsuite"
    ;;
    *)
    INC_PATH="-nostdinc++ @CSHADOW_FLAGS@ -I${BUILD_DIR}/include
	      -I${SRC_DIR}/include/std  -I${SRC_DIR}/include/$C_DIR
	      -I${SRC_DIR}/include -I${SRC_DIR}/libsupc++ -I${SRC_DIR}/libio 
	      -I${SRC_DIR}/testsuite"
    ;;
esac

# If called for compiler tests, just output include paths
case ${query} in
    --compiler)
    echo ${INC_PATH} -I${SRC_DIR}/include/backward -I${SRC_DIR}/include/ext
    exit 0
    ;;
esac

# For built or installed libraries, we need to get right OS-specific bits.
. ${top_srcdir}/configure.target

# LIB_PATH == where to find the build libraries for libtool's use
# CXX == how to call the compiler
case ${query} in
    --built-library)
    LIB_PATH=${BUILD_DIR}/src
    CXX="${BUILD_DIR}/../../gcc/g++ -B${BUILD_DIR}/../../gcc/"
    ;;
    --installed-library)
    LIB_PATH=${PREFIX_DIR}/lib
    CXX=${PREFIX_DIR}/bin/g++
    ;;
esac

# gcc compiler flags (maybe use glibcpp_cxxflags from configure.target,
# but thst's really meant for building the library itself, not using it)
CXXFLAGS="-ggdb3 -DDEBUG_ASSERT @SECTION_FLAGS@ @SECTION_LDFLAGS@"

# LTCXX == how to call libtool when creating an executable
# LIBS == any extra needed -l switches, etc (may need more libs, lose lose)
case ${query} in
    --built-library)
    LTCXX="${LIBTOOL} --tag=CXX --mode=link ${CXX} ${CXXFLAGS} ${INC_PATH} 
	   ${LIB_PATH}/../libsupc++/libsupc++.la  ${LIB_PATH}/libstdc++.la
	   -no-install"
    LTEXE="${LIBTOOL} --mode=execute"
    LIBS="-nodefaultlibs -lc -lgcc -lc"
    ;;
    --installed-library)
    # For the installed version, we really only need to use libtool and
    # the .la file to get correct rpaths.
    LTCXX="${LIBTOOL} --tag=CXX --mode=link ${CXX} ${CXXFLAGS} ${INC_PATH}
	   -L${LIB_PATH} ${LIB_PATH}/libstdc++.la -no-install 
	   -rpath ${LIB_PATH}"
    LTEXE="${LIBTOOL} --mode=execute"
    LIBS=
    ;;
esac

echo ${BUILD_DIR}:${SRC_DIR}:${PREFIX_DIR}:${LTCXX}:${LIBS}:${LTEXE}:${CXX}:${CXXFLAGS}
exit 0