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# -*- shell-script -*-
#   Copyright (C) 2011, 2012 Free Software Foundation, Inc.

# 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.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  

# This is the target specific configuration file.  This is invoked by the
# autoconf generated configure script.  Putting it in a separate shell file
# lets us skip running autoconf when modifying target specific information.

# This file switches on the shell variable ${target}, and sets the
# following shell variables:
#  config_path          An ordered list of directories to search for
#                       sources and headers.  This is relative to the
#                       config subdirectory of the source tree.
#  XCFLAGS              Add extra compile flags to use.
#  XLDFLAGS             Add extra link flags to use.

# Optimize TLS usage by avoiding the overhead of dynamic allocation.
if test "$gcc_cv_have_tls" = yes ; then
  case "${target}" in

    # For x86, we use slots in the TCB head for most of our TLS.
    # The setup of those slots in beginTransaction can afford to
    # use the global-dynamic model.
    i[456]86-*-linux* | x86_64-*-linux*)
        ;;
    
    *-*-linux*)
        XCFLAGS="${XCFLAGS} -ftls-model=initial-exec"
        ;;
  esac
fi

# Map the target cpu to an ARCH sub-directory.  At the same time,
# work out any special compilation flags as necessary.
case "${target_cpu}" in
  alpha*)               ARCH=alpha ;;
  rs6000 | powerpc*)    ARCH=powerpc ;;

  arm*)         ARCH=arm ;;

  i[3456]86)
        case " ${CC} ${CFLAGS} " in
          *" -m64 "*)
            ;;
          *)
            if test -z "$with_arch"; then
              XCFLAGS="${XCFLAGS} -march=i486 -mtune=${target_cpu}"
              XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
            fi
        esac
        ARCH=x86
        ;;

  sh*)          ARCH=sh ;;

  sparc)
        case " ${CC} ${CFLAGS} " in
          *" -m64 "*)
            ;;
          *)
            if test -z "$with_cpu"; then
              XCFLAGS="${XCFLAGS} -mcpu=v9"
            fi
        esac
        ARCH=sparc
        ;;

  sparc64|sparcv9)
        case " ${CC} ${CFLAGS} " in
          *" -m32 "*)
            XCFLAGS="${XCFLAGS} -mcpu=v9"
            ;;
          *" -m64 "*)
            ;;
          *)
            if test "x$with_cpu" = xv8; then
              XCFLAGS="${XCFLAGS} -mcpu=v9"
            fi
            ;;
        esac
        ARCH=sparc
        ;;

  x86_64)
        case " ${CC} ${CFLAGS} " in
          *" -m32 "*)
            XCFLAGS="${XCFLAGS} -march=i486 -mtune=i686"
            XCFLAGS="${XCFLAGS} -fomit-frame-pointer"
            ;;
        esac
        ARCH=x86
        ;;

  *)
        ARCH="${target_cpu}"
        ;;
esac

# For the benefit of top-level configure, determine if the cpu is supported.
test -d ${srcdir}/config/$ARCH || UNSUPPORTED=1

# Since we require POSIX threads, assume a POSIX system by default.
config_path="$ARCH posix generic"

# Other system configury
case "${target}" in
  *-*-linux*)
        if test "$enable_linux_futex" = yes; then
          config_path="linux/$ARCH linux $config_path"
        fi
        ;;

  powerpc*-*-aix* | rs6000-*-aix*)
        # The system ought to be supported, but sjlj.S has not been ported.
        UNSUPPORTED=1
        ;;

  *-*-gnu* | *-*-k*bsd*-gnu \
  | *-*-netbsd* | *-*-freebsd* | *-*-openbsd* \
  | *-*-solaris2* | *-*-sysv4* | *-*-irix6* | *-*-osf* | *-*-hpux11* \
  | *-*-darwin* | *-*-aix*)
        # POSIX system.  The OS is supported.
        ;;

  *)    # Non-POSIX, or embedded system
        UNSUPPORTED=1
        ;;
esac