#!/bin/sh
# Front-end kludge to cause a Cygwin gcc to default to
# an installed version of the MinGW components.

#
# Find the path to the compiler.
#
compiler=$1; shift
case "$compiler" in
	*/*)	;;
	*)	compiler=($(type "$compiler"))
		compiler=${compiler[2]} ;;
esac

#
# The mingw32 directory should live somewhere close by to the
# compiler.  Search for it.
#
updir=$(dirname "$compiler")
dir=$(cd "$updir"/..; pwd)
[ "$dir" = '/' ] && dir=''
mingw_dir=''
for d in "$dir"/*-mingw32 "$dir"/usr/*-mingw32 "$dir"/*-mingw* "$dir"/usr/*-mingw*; do
    case "$d" in
	*\**)	continue ;;
	*)	mingw_dir=$d; break;
    esac
done

if [ -z "$mingw_dir" ]; then
    echo "$0: couldn't find i686-pc-mingw32 directory" 1>&2
    exit 1
fi

#
# Inspect each argument throwing away ones that seem to try to include the
# Cygwin environment.
#
newargs=()
sawcomp() { return 1; }
sawcfile() { return 1; }
sawofile() { return 1; }
eatnext() { return 1; }
pushnext() { return 1; }
for f do
    if eatnext; then
	eatnext() { return 1; }
	continue;
    fi
    if pushnext; then
	pushnext() { return 1; }
    else
	case "$f" in
	    *cygwin/include*|*newlib*) continue ;;
	    -c|-E)		sawcomp() { return 0; } ;;
	    -isystem)	eatnext() { return 0; }; continue ;;
	    -o)		pushnext() { return 0; } ; /bin/true ;;
	    -*)		;;
	    *.cc|*.c)	sawcfile() { return 0; } ;;
	    *.o)		sawofile() { return 0; }; /bin/true  ;;
	esac
    fi
    newargs[${#newargs[*]}]="$f"
done

# Set up a new set of arguments + also search the installed mingw
# directory.
set -- -B"$mingw_dir"/lib/ "${newargs[@]}"

# Add some default options depending on whether this looks like
# an attempt to link, compile, or both.
if sawcomp || sawcfile; then
    ccdir=$(dirname $($compiler -print-libgcc-file-name))
    set -- -isystem "$ccdir"/include -D__MINGW32__ -D__MSVCRT__ -DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ -U__CYGWIN__ -Uunix -U__unix__ -U__unix -U __CYGWIN32__ -I"${mingw_dir}"/include "$@"
    case "$compiler" in
	*++*) set -- -nostdinc++ "$@" ;;
	*) set -- -nostdinc "$@" ;;
    esac
fi

if sawofile || ! sawcfile || ! sawcomp; then
    w32api=$($compiler -print-file-name=libc.a)
    w32api=$(cd $(dirname "$w32api")/w32api; pwd)
    set -- "$@" -nostdlib -Wl,-nostdlib -L"$w32api" -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt -lmingw32 -luser32 -lkernel32 -ladvapi32 -lshell32 -lmingw32 -lgcc -lmoldname -lmingwex -lmsvcrt
    { sawofile || sawcfile; } && set -- "$mingw_dir"/lib/crt2.o "$@"
fi

# Execute the compiler with new mingw-specific options.
exec $compiler "$@"