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#! /bin/sh
#
# c - C compile command
#
# Copyright (c) 1996-2009 iMatix Corporation
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# For information on alternative licensing for OEMs, please contact
# iMatix Corporation.
#

# Syntax: c filename... Compile ANSI C program(s)
# c -c filename... (Backwards compatible: compile C programs)
# c -l main... Compile and link main program(s)
# c -L main... Link main program(s), no compile
# c -S Report detected system name
# c -C Report C compiler command syntax
# c -r lib file... Replace object file(s) into library
# -li path Local include path, additional to INCDIR
# -ll path Local library path, additional to LIBDIR
# -g Compile and link with debug information
# -p Use C++ compiler instead of C
# When linking, link with C++ runtime
# When replacing, replace .opp file
# -v Be verbose
# -q Be quiet
# -<xxxx> Arbitrary switch passed to compiler/linker
#
# Requires: Bourne shell
# Usage: Compiles a subroutine or compiles/links a main program.
#
# The following variables can be set to control the program:
# CCDEFINES Options required for ANSI C/C++ compilation
# CCLIBS Options required for ANSI C/C++ linking
# CCNAME Name of C compiler if not default
# CCPLUS Name of C++ compiler if not default
# CCCAT Command used to print listings (cat)
# INCDIR Directory to search for include files
# LIBDIR Directory to search for libraries
#
# When using iMatix Boom, if the IBASE environment variable is set and
# conflicts with INCDIR or LIBDIR, c will issue a warning.
#
# To make compile/link errors less verbose, set CCCAT to "head".
#
# Note that these environment variables have different semantics to the
# "standard" GNU variables such as CFLAGS which is why these are not
# used in this script.
#
#----------------------------------------------------------------------------

#
# Utility functions for parsing BOOM_MODEL
#

# Returns a list of all BOOM_MODEL_$MODEL variables set
boom_model_list () {
    set |
        awk 'BEGIN { FS="[=_]" }
/^BOOM_MODEL_[A-Z0-9]*=1$/ { print $3 }'
}

# Expands $BOOM_MODEL into individual BOOM_MODEL_$MODEL variables
boom_model_expand () {
    # Clear any existing settings
    for MODEL in `boom_model_list`; do
        eval unset BOOM_MODEL_$MODEL
    done
    # Iterate over BOOM_MODEL using ',' as FS
    OLD_IFS=$IFS
    IFS=,
    for MODEL in $BOOM_MODEL; do
        MODEL=`echo $MODEL | tr \[a-z\] \[A-Z\]`
        eval BOOM_MODEL_$MODEL=1
        eval export BOOM_MODEL_$MODEL
    done
    IFS=$OLD_IFS
}

# If not already known, detect UNIX system type.

if [ -z "$UTYPE" ]; then
    UTYPE=Generic # Default system name
    if [ -s /usr/bin/uname ]; then UTYPE=`/usr/bin/uname`; fi
    if [ -s /bin/uname ]; then UTYPE=`/bin/uname`; fi
fi

#
# Set default values for BOOM_MODEL
#
# Default is release,mt on all platforms.
#
if [ -z "$BOOM_MODEL" ]; then
    BOOM_MODEL=release,mt
fi
boom_model_expand
if [ "$BOOM_MODEL_RELEASE" != "1" ]; then
    if [ "$BOOM_MODEL_DEBUG" != "1" ]; then
        BOOM_MODEL_RELEASE=1
        BOOM_MODEL="$BOOM_MODEL,release"
    fi
fi
if [ "$BOOM_MODEL_ST" != "1" ]; then
    if [ "$BOOM_MODEL_MT" != "1" ]; then
        BOOM_MODEL_MT=1
        BOOM_MODEL="$BOOM_MODEL,mt"
    fi
fi

# Set specific system compiler options and other flags
# CCNAME Name of compiler
# CCOPTS Compiler options, except -c
# LINKTYPE One of (before, after, gnu)
# RANLIB Use ranlib command to reindex library; else use 'ar rs'
#
# CCOPTS has no sensible default; so has to be either set by the
# general configuration variables, or detected based on system type
# and compiler. If CCOPTS is set, we assume the other values are
# set or the defaults are correct.
#
# NOTE: CCNAME default is set below these checks, so that we can test
# on CCNAME when setting CCOPTS, and/or set CCNAME and CCOPTS together.
#
CCCAT="${CCCAT:-cat}" # By default, "cat"
RANLIB="${RANLIB:-0}" # By default, "ar rs" is used
LINKTYPE="${LINKPATH:-after}" # By default, accept '-lsfl... -L.'

#
# First, check if GCC is present. If we can't find it and the
# user hasn't specified an alternative, then exit.
#
if [ -z "$CCNAME" -a -z "$CCOPTS" ]; then
    if type gcc >/dev/null 2>/dev/null; then
        CCNAME="gcc"
        CCPLUS="g++"
    else
        cat <<EOM 1>&2
E: Could not find 'gcc' on PATH. 'c' requires gcc to build.
E: For other alternatives that may be available on your platform
E: please consult the 'c' script.
EOM
        exit 1
    fi
fi

#
# Generic modern GCC system
#
if [ "$CCNAME" = "gcc" ]; then
    [ -z "$BOOM_MODEL_NOOPT" ] && CCDEBUG="-O2"
    [ -z "$BOOM_MODEL_NOOPT" ] && CCNODEBUG="$CCNODEBUG -O2"
    CCOPTS="-D_REENTRANT -D_GNU_SOURCE -Wall -Wno-unused -fno-strict-aliasing"
    # We assume the following standard libraries are all present.
    # If your build is failing because of missing libraries then
    # either you are missing development packages, or are on a non-standard/old
    # system and should add a special case.
    STDLIBS="-lpthread -lm"

    #
    # Linux-specific subsection
    #
    if [ "$UTYPE" = "Linux" ]; then
        # Use -start-group / -end-group for linking
        STDLIBS="$STDLIBS -lrt -lcrypt"
        LINKTYPE="gnu"
    #
    # Darwin-specific subsection
    #
    elif [ "$UTYPE" = "Darwin" ]; then
        # Use -start-group / -end-group for linking
        STDLIBS="$STDLIBS -lstdc++"
        LINKTYPE="after"
    #
    # Solaris-specific subsection
    #
    elif [ "$UTYPE" = "SunOS" ]; then
        # Extra system libraries needed to link on Solaris
        STDLIBS="$STDLIBS -lrt -lcrypt -lsocket -lnsl -lsendfile"
        # Standard "dumb" linker
        LINKTYPE="before"
        # For MT release builds, pick the best possible memory allocator
        # out of the available options. mtmalloc is available in
        # at least Solaris 8 and newer, umem is available in
        # Solaris 9 update 3 and newer. If either is available,
        # request iCL use direct memory allocator by default for
        # MT release builds.
        if [ "$BOOM_MODEL_MT" -a "$BOOM_MODEL_RELEASE" ]; then
            if [ -f /usr/lib/libumem.so ]; then
                STDLIBS="$STDLIBS -lumem"
            elif [ -f /usr/lib/libmtmalloc.so ]; then
                STDLIBS="$STDLIBS -lmtmalloc"
            fi
        fi
        # Workaround for FOR-24
        STDLIBS="-lapr $STDLIBS"
    fi
#
# AIX with xlc
#
elif [ "$UTYPE" = "AIX" -a "$CCNAME" = "xlc_r" ]; then
    [ -z "$BOOM_MODEL_NOOPT" ] && CCNODEBUG="-O"
    CCNAME="xlc_r" # Use VAC Threaded Mode
    CCPLUS="xlC_r" # Use VAC Threaded Mode
    CCOPTS="$CCOPTS -D_REENTRANT"
    STDLIBS="-lpthread"
fi

# Patch together the CC options and defines into one variable
CCOPTS="$CCOPTS $CCDEFINES"
if [ "$BOOM_MODEL_DEBUG" ]; then
    CCOPTS="-g -DDEBUG $CCDEBUG $CCOPTS"
else
    CCOPTS="$CCNODEBUG $CCOPTS"
fi

# Select ST or MT build for iMatix Base2 framework
if [ "$BOOM_MODEL_MT" ]; then
    CCOPTS="$CCOPTS -DBASE_THREADSAFE"
fi

# Parse command line arguments, figure out what we are doing
# (Parsing is currently fairly simplistic, and depends on ordering
# of flags. Could be improved later if required.)
LINKUP=no
COMPILE=yes
USECPP=no
VERBOSE=${VERBOSE:-no}
QUIET=${QUIET:-no} # Default is non-verbose messages
LOCALLIBDIR=. # By default, search current directory twice

if [ -n "$IBASE" ]; then
    if [ -z "$INCDIR" ]; then
        INCDIR=$IBASE/include
    else
        if [ "$INCDIR" != "$IBASE/include" ]; then
            echo "W: INCDIR=$INCDIR is in conflict with IBASE=$IBASE" 1>&2
        fi
    fi
    if [ -z "$LIBDIR" ]; then
        LIBDIR=$IBASE/lib
    else
        if [ "$LIBDIR" != "$IBASE/lib" ]; then
            echo "W: LIBDIR=$LIBDIR is in conflict with IBASE=$IBASE" 1>&2
        fi
    fi
else
    if [ -z "$INCDIR" ]; then
        INCDIR=.
    fi
    if [ -z "$LIBDIR" ]; then
        LIBDIR=.
    fi
fi

# Process switches in no particular order until there are none left
while true; do
    # -v means verbose reports
    if [ /$1/ = /-v/ ]; then
        VERBOSE=yes
        shift

    # -q means quiet
    elif [ /$1/ = /-q/ ]; then
        QUIET=yes
        shift

    # -g means compile/link with debugging symbols
    elif [ /$1/ = /-g/ ]; then
        BOOM_MODEL_DEBUG=1
        unset BOOM_MODEL_RELEASE
        shift

    # -p means use C++ compiler
    elif [ /$1/ = /-p/ ]; then
        USECPP=yes
        shift

    # -S means report detected system type
    elif [ /$1/ = /-S/ ]; then
        echo "$UTYPE"
        exit

    # -C means report compiler syntax type
    elif [ /$1/ = /-C/ ]; then
        echo "$CCNAME -c -I$INCDIR $CCOPTS"
        exit

    # -c means compile the object -- we were going to do that anyway,
    # but this ensures backwards compatibility
    elif [ /$1/ = /-c/ ]; then
        shift

    # -r means replace object file into library
    # The RANLIB symbol should be set to 1 if 'ar rs' does not work.
    elif [ /$1/ = /-r/ ]; then
        LIBRARY=$2
        LIBNAME=`echo $LIBRARY | cut -d"." -f1`
        shift; shift

for i in $*; do
            shift
OBJECT=`echo $i | cut -d"." -f1`
            if [ "$USECPP" = "no" ]; then
                OBJECT=$OBJECT.o
            else
                OBJECT=$OBJECT.opp
            fi

            TRACE="Replacing object $OBJECT in library $LIBRARY"
            if [ -f $LIBNAME.a ]; then
                AR_CREATE_OPT=""
            else
                AR_CREATE_OPT="c"
            fi
            if [ "$RANLIB" = "1" ]; then
                COMMAND="ar ${AR_CREATE_OPT}r $LIBNAME.a $OBJECT"
            else
                COMMAND="ar ${AR_CREATE_OPT}rs $LIBNAME.a $OBJECT"
            fi
            if [ "$QUIET" = "no" ]; then
                if [ "$VERBOSE" = "no" ]; then
                    echo "$TRACE..."
                else
                    echo "$TRACE ($COMMAND)..."
                fi
            fi
            if [ ! -z "$CCTRACE" ]; then
                echo "$TRACE ($COMMAND)">>$CCTRACE
            fi
            $COMMAND

            # Run ranlib if necessary
            if [ "$RANLIB" = "1" ]; then
                ranlib $LIBNAME.a
            fi
        done
        exit

    # Compile/link main if -l is first argument
    elif [ /$1/ = /-l/ ]; then
        LINKUP=yes
        shift

    # Link main if -L is first argument (assumed to already be compiled)
    elif [ /$1/ = /-L/ ]; then
        LINKUP=yes
        COMPILE=no
        shift

    # -li means use local include path as well as INCDIR
    elif [ /$1/ = /-li/ ]; then
        CCOPTS="-I$2 $CCOPTS"
        shift; shift

    # -ll means use local library path as well as LIBDIR
    elif [ /$1/ = /-ll/ ]; then
        LOCALLIBDIR=$2
        shift; shift

elif [ /`echo $1 | cut -c1`/ = /-/ ]; then
        EXTRA="$EXTRA $1"
        shift

else
        break # Not a switch
    fi
done

# If we will be linking, then build list of libraries to link with.

if [ "$LINKUP" = "yes" -o /$1/ = // ]; then
    LIBLIST=""
    for LIBRARY in lib*.a $LOCALLIBDIR/lib*.a $LIBDIR/lib*.a; do
        if [ ! -f $LIBRARY ]; then
            continue
        fi
        # Pull out the xxx from libxxx.a (or similar)
        LIBNAME=`basename $LIBRARY | sed -e 's/^...\([^\.]*\)\..*$/\1/'`
        LIBLIST="$LIBLIST -l$LIBNAME"
    done
    LIBLIST="$LIBLIST $STDLIBS $CCLIBS"
fi

CCOPTS="$EXTRA $CCOPTS"
# Show help if no arguments
if [ /$1/ = // ]; then
    echo "Detected system=$UTYPE, compiles with:"
    echo " $CCNAME -c -I$INCDIR $CCOPTS"
    echo "Syntax: c filename... Compile ANSI C program(s)"
    echo " c -c filename... Compile ANSI C programs(s)"
    echo " c -l main... Compile and link main program(s)"
    echo " c -L main... Link main(s) with" ${LIBLIST-"no libraries"}
    echo " c -S Report detected system name"
    echo " c -C Report C compiler command syntax"
    echo " c -r lib file Replace file into specified library"
    echo " -li path Local include path, additional to INCDIR"
    echo " -ll path Local library path, additional to LIBDIR"
    echo " -g Compile and link with debug information"
    echo " -p Use C++ compiler instead of C"
    echo " When linking, link with C++ runtime"
    echo " When replacing, replace .opp file"
    echo " -v Be verbose"
    echo " -q Be quiet"
    echo " -<xxxx> Arbitrary switch passed to compiler/linker"
    exit
fi

# Compile and maybe link each filename on the command line
for i in $*; do
    if [ "$i" = "-o" ]; then
        exit 0 # Skip -o filename
    fi
    FILENAME=`echo $i | cut -d"." -f1`

    # Compile, if required
    if [ "$USECPP" = "no" ]; then
        OBJEXT=o
    else
        OBJEXT=opp
    fi
    if [ "$COMPILE" = "yes" -o ! -f $FILENAME.$OBJEXT ]; then
        if [ -f $FILENAME.$OBJEXT ]; then
            rm $FILENAME.$OBJEXT
        fi

        TRACE="Compiling $FILENAME"
        if [ "$USECPP" = "no" ]; then
            COMMAND="$CCNAME -c $CCOPTS -I$INCDIR $FILENAME.c"
        else
            COMMAND="$CCPLUS -c $CCOPTS -I$INCDIR -o $FILENAME.opp $FILENAME.cpp"
        fi
        if [ "$QUIET" = "no" ]; then
            if [ "$VERBOSE" = "no" ]; then
                echo "$TRACE..."
            else
                echo "$TRACE ($COMMAND)..."
            fi
        fi
        if [ ! -z "$CCTRACE" ]; then
            echo "$TRACE ($COMMAND)">>$CCTRACE
        fi

        # Need to remove any quotes in command string to pass as macro
        SYNTAX=`echo $COMMAND | sed -e "s/\"//g"`
        $COMMAND -DCCOPTS="\"$SYNTAX\"" >$FILENAME.lst 2>&1

        # Show listing and abort if there was a compile error
        if [ $? -eq 0 ]; then
            cat $FILENAME.lst
            rm $FILENAME.lst
        else
            # Only show start of listing if there was an error
            $CCCAT $FILENAME.lst
            if [ ! -z "$CCTRACE" ]; then
                cat $FILENAME.lst >>$CCTRACE
            fi
            exit 1
        fi
    fi

    # If okay, link if required
    if [ "$LINKUP" = "yes" ]; then
        TRACE="Linking $FILENAME"
        if [ "$USECPP" = "no" ]; then
            COMMAND="$CCNAME $CCOPTS $FILENAME.o -o $FILENAME"
        else
            COMMAND="$CCPLUS $CCOPTS $FILENAME.opp -o $FILENAME"
        fi
        case "$LINKTYPE" in
            gnu)
                COMMAND="$COMMAND -Wl,--start-group $LIBLIST -Wl,--end-group -L. -L$LOCALLIBDIR -L$LIBDIR $STDLIBS"
                ;;
            before)
                COMMAND="$COMMAND -L. -L$LOCALLIBDIR -L$LIBDIR $LIBLIST $LIBLIST $STDLIBS"
                ;;
            after)
                COMMAND="$COMMAND $LIBLIST $LIBLIST -L. -L$LOCALLIBDIR -L$LIBDIR $STDLIBS"
                ;;
        esac

        if [ "$QUIET" = "no" ]; then
            if [ "$VERBOSE" = "no" ]; then
                echo "$TRACE..."
            else
                echo "$TRACE ($COMMAND)..."
            fi
        fi
        if [ ! -z "$CCTRACE" ]; then
            echo "$TRACE ($COMMAND)">>$CCTRACE
        fi

        $COMMAND 2> $FILENAME.lst

        # Show listing and abort if there was a link error
        if [ $? -eq 0 ]; then
            cat $FILENAME.lst
            rm $FILENAME.lst
        else
            if [ "$VERBOSE" = "yes" ]; then
                cat $FILENAME.lst
            else
                # Show first page of link errors only
                head $FILENAME.lst
            fi
            if [ ! -z "$CCTRACE" ]; then
                cat $FILENAME.lst >>$CCTRACE
            fi
            exit 1
        fi
    fi
done
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