########################################################################
#
# configure.host -- JACK Audio Connection Kit version.
#
# This script and the system-dependent header directories it uses were
# adapted for JACK from gcc/libstdc++-v3/configure.host.
#
# We've tried to keep it as close to the original as possible, while
# removing a bunch of os-specific files that didn't seem relevant.
# The primary goal has been to avoid changing the cpu-dependent
# atomicity.h headers.
#
# If you need to make changes, the relevant GCC documentation may
# prove helpful, <http://gcc.gnu.org/onlinedocs/porting>, especially
# the <http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html>
# discussion of <atomicity.h>.
#
########################################################################

# This shell script handles all host based configuration for libstdc++.
# It sets various shell variables based on the the host and the
# configuration options.  You can modify this shell script without needing
# to rerun autoconf/aclocal/etc.  This file is "sourced" not executed.
#
# You should read docs/html/17_intro/porting.* to make sense of this file.
#
#
# It uses the following shell variables as set by config.guess:
#   host                The configuration host (full CPU-vendor-OS triplet)
#   host_cpu            The configuration host CPU
#   host_os             The configuration host OS
#
#
# It sets the following shell variables:
#
#   cpu_include_dir        CPU-specific directory, defaults to cpu/generic
#                          if cpu/host_cpu doesn't exist.  This is
#                          used to set atomicity_include_dir.
#
#   os_include_dir         OS-specific directory, defaults to os/generic.
#
#   atomicity_include_dir  location of atomicity.h,
#                          defaults to cpu_include_dir
#
# It possibly modifies the following variables:
#
#   OS_LDFLAGS             extra flags to pass when linking the library, of
#                          the form '-Wl,blah'
#                          (defaults to empty in acinclude.m4)
#
# If the defaults will not work for your platform, you need only change the
# variables that won't work, i.e., you do not need to explicitly set a
# working variable to its default.  Most hosts only need to change the two
# *_include_dir variables.


# DEFAULTS
# Try to guess a default cpu_include_dir based on the name of the CPU.  We
# cannot do this for os_include_dir; there are too many portable operating
# systems out there.  :-)

# HOST-SPECIFIC OVERRIDES
# Set any CPU-dependent bits.
# Here we override defaults and catch more general cases due to naming
# conventions (e.g., chip_name* to catch all variants).

# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
case "${host_cpu}" in
  alpha*)
    try_cpu=alpha
    ;;
  i[3567]86 | x86_64 | amd64)
    # Note that this causes us to compile i386 using i486
    # instructions.  This is done for binary distributions, which
    # typically compile for i386 as the lowest common denominator.
    # Since JACK is unlikely to actually be used on a real i386, we
    # substitute i486 as our common denominator.  That way the atomic
    # instructions work properly.
    try_cpu=i486
    ;;
  hppa*)
    try_cpu=hppa
    ;;
  mips*)
    # NB: cpu/mips/atomicity.h needs MIPS II or above.  
    # Of course, there is no sane way to test for this, no ABI macro,
    # and no consistent host_cpu name differentiation. Therefore, only
    # use it where it is known to be safe, ie it runs linux (see below).
    try_cpu=generic
    ;;
  m680[246]0)
    try_cpu=m68k
    ;;
  powerpc* | rs6000)
    try_cpu=powerpc
    ;;
  s390x)
    try_cpu=s390
    ;;
  sparc* | ultrasparc)
    try_cpu=sparc
    ;;
  *)
    if test -d $srcdir/config/cpu/${host_cpu}; then
      try_cpu=${host_cpu}
    else
      try_cpu=generic
    fi
    ;;
esac

# Now look for the file(s) usually tied to a CPU model, and make
# default choices for those if they haven't been explicitly set
# already.  
cpu_include_dir="cpu/${try_cpu}"
atomicity_include_dir=$cpu_include_dir


# Set any OS-dependent bits.
# Set the os_include_dir.
# If atomic ops and/or numeric limits are OS-specific rather than
# CPU-specifc, set those here too.
# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
case "${host_os}" in
  aix4.[3456789]* | aix[56789]*)
    # We set os_include_dir to os/aix only on AIX 4.3 and newer, but
    # os/aix/atomicity.h works on earlier versions of AIX 4.*, so we
    # explicitly duplicate the directory for 4.[<3].
    os_include_dir="os/aix"
    atomicity_include_dir="os/aix"
    OS_LDFLAGS="-Wl,-G"
    ;;
  aix4.*)
    os_include_dir="os/generic"
    atomicity_include_dir="os/aix"
    ;;
  aix*)
    os_include_dir="os/generic"
    atomicity_include_dir="cpu/generic"
    ;;
  gnu* | linux* | kfreebsd*-gnu | knetbsd*-gnu)
    os_include_dir="os/gnu-linux"
    ;;
  freebsd*)
    # current FreeBSD header files conflict with the OSS driver's
    # barrier code, this may be fixed in 5.3, stay tuned.
    os_include_dir="os/generic"
    USE_BARRIER="no"
    ;;
  irix*)
    os_include_dir="os/irix"
    atomicity_include_dir=$os_include_dir
    ;;
  darwin*)
    os_include_dir="os/macosx"
    JACK_THREAD_STACK_TOUCH=10000	# need small realtime stack
    JACK_CPP_VARARGS_BROKEN=1
    JACK_DO_NOT_MLOCK=1
    JACK_USE_MACH_THREADS=1
    OS_LDFLAGS="-framework CoreAudio"
    TRY_POSIX_SHM=yes			# POSIX shm works better
    ;;
  *)
    os_include_dir="os/generic"
    ;;
esac


# Set any OS-dependent and CPU-dependent bits.
# THIS TABLE IS SORTED.  KEEP IT THAT WAY.
case "${host}" in
  mips*-*-linux*)
    atomicity_include_dir="cpu/mips"
    ;;
esac