# libstdc++ "tool init file" for DejaGNU

# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
# 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 3 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; see the file COPYING3.  If not see
# <http://www.gnu.org/licenses/>.


# Define callbacks and load other libraries.  This file is loaded relatively
# early, and before any other file we write ourselves.  "load_lib" will
# find anything in the DejaGNU installation tree, or in our lib directory.
# "load_gcc_lib" will search the core compiler's .exp collection instead.
#
# The naming rule is that dg.exp looks for "tool-" and runtest.exp looks
# for "tool_" when finding callbacks.  Utility routines we define for
# our callbacks begin with "v3-".
#
# libstdc++_* callbacks we don't define, but could:
# ..._option_help           prints additional --help output
# ..._option_proc (--foo)   process our own options
# ..._init (normal.exp)     called once per test file
# ..._finish                bracketing function for libstdc++_init
# ...-dg-prune              removing output text, see top of system dg.exp
#
# Useful hook:  if ${hostname}_init exists, it will be called, almost
# the last thing before testing begins.  This can be defined in, e.g.,
# ~/.dejagnurc or $DEJAGNU.

proc load_gcc_lib { filename } {
    global srcdir
    load_file $srcdir/../../gcc/testsuite/lib/$filename
}

# system routines
load_lib dg.exp
load_lib libgloss.exp
# compiler routines, then ours
load_gcc_lib target-supports.exp
load_gcc_lib target-supports-dg.exp
load_lib prune.exp
load_lib dg-options.exp
load_gcc_lib scanasm.exp
load_gcc_lib target-libpath.exp
load_gcc_lib timeout.exp
load_gcc_lib timeout-dg.exp
load_gcc_lib wrapper.exp

# Useful for debugging.  Pass the name of a variable and the verbosity
# threshold (number of -v's on the command line).
proc v3track { var n } {
    upvar $var val
    verbose "++ $var is $val" $n
}

# Called by v3-init below.  "Static" to this file.
proc v3-copy-files {srcfiles} {
    foreach f $srcfiles {
        if { [catch { set symlink [file readlink $f] } x] } then {
	    remote_download target $f
        } else {
            if { [regexp "^/" "$symlink"] } then {
		remote_download target $symlink
            } else {
                set dirname [file dirname $f]
		remote_download target $dirname/$symlink
            }
        }
    }
}

# Called once, during runtest.exp setup.
proc libstdc++_init { testfile } {
    global env
    global v3-sharedlib v3-libgomp
    global srcdir blddir objdir tool_root_dir
    global cc cxx cxxflags cxxpchflags cxxldflags
    global includes
    global gluefile wrap_flags
    global ld_library_path
    global target_triplet
    global flags_file
    global tool_timeout
    global DEFAULT_CXXFLAGS
    global STATIC_LIBCXXFLAGS

    # We set LC_ALL and LANG to C so that we get the same error
    # messages as expected.
    setenv LC_ALL C
    setenv LANG C

    # Many hosts now default to a non-ASCII C locale, however, so
    # they can set a charset encoding here if they need.
    if { [ishost "*-*-cygwin*"] } {
      setenv LC_ALL C.ASCII
      setenv LANG C.ASCII
    }

    set blddir [lookfor_file [get_multilibs] libstdc++-v3]
    set flags_file "${blddir}/scripts/testsuite_flags"
    set shlib_ext [get_shlib_extension]
    v3track flags_file 2

    # If a test doesn't have special options, use DEFAULT_CXXFLAGS.
    # Use this variable if the behavior
    #   1) only applies to libstdc++ testing
    #   2) might need to be negated 
    # In particular, some tests have to be run without precompiled
    # headers, or without assertions.

    if ![info exists DEFAULT_CXXFLAGS] then {
	set DEFAULT_CXXFLAGS ""
	# Host specific goo here.
	if { [string match "powerpc-*-darwin*" $target_triplet] } {
	    append DEFAULT_CXXFLAGS " -multiply_defined suppress"
	} 
    }
    v3track DEFAULT_CXXFLAGS 2

    # By default, we assume we want to run program images.
    global dg-do-what-default
    set dg-do-what-default run

    # Copy any required data files.
    v3-copy-files [glob -nocomplain "$srcdir/data/*.tst"]
    v3-copy-files [glob -nocomplain "$srcdir/data/*.txt"]

    set ld_library_path_tmp ""

    # Locate libgcc.a so we don't need to account for different values of
    # SHLIB_EXT on different platforms
    set gccdir [lookfor_file $tool_root_dir gcc/libgcc.a]
    if {$gccdir != ""} {
        set gccdir [file dirname $gccdir]
	append ld_library_path_tmp ":${gccdir}"
    }
    v3track gccdir 3

    # Locate libgomp. This is only required for parallel mode.
    set v3-libgomp 0
    set libgompdir [lookfor_file $blddir/../libgomp .libs/libgomp.$shlib_ext]
    if {$libgompdir != ""} {
	set v3-libgomp 1
        set libgompdir [file dirname $libgompdir]
	append ld_library_path_tmp ":${libgompdir}"
	verbose -log "libgomp support detected"
    }
    v3track libgompdir 3

    # Locate libstdc++ shared library. (ie libstdc++.so.)
    set v3-sharedlib 0
    set sharedlibdir [lookfor_file $blddir src/.libs/libstdc++.$shlib_ext]
    if {$sharedlibdir != ""} {
	if { [string match "*-*-linux*" $target_triplet] && [isnative] } {
	    set v3-sharedlib 1
	    verbose -log "shared library support detected"
	} 
    }
    v3track v3-sharedlib 3

    set STATIC_LIBCXXFLAGS ""
    set staticlibdir [lookfor_file $blddir src/.libs/libstdc++.a]
    if {$staticlibdir != ""} {
	set staticlibdir [file dirname $staticlibdir]
	# Some targets use libstdc++.a%s in their specs, so they need a
	# -B option for uninstalled testing.
	set STATIC_LIBCXXFLAGS " -B${staticlibdir} "
    }

    # Compute what needs to be added to the existing LD_LIBRARY_PATH.
    if {$gccdir != ""} {
	set compiler ${gccdir}/g++
	set ld_library_path ${ld_library_path_tmp}
	append ld_library_path ":${blddir}/src/.libs"

	if { [is_remote host] == 0 && [which $compiler] != 0 } {
	  foreach i "[exec $compiler --print-multi-lib]" {
	    set mldir ""
	    regexp -- "\[a-z0-9=_/\.-\]*;" $i mldir
	    set mldir [string trimright $mldir "\;@"]
	    if { "$mldir" == "." } {
	      continue
	    }
	    if { [llength [glob -nocomplain ${gccdir}/${mldir}/libgcc_s*.so.*]] >= 1 } {
	      append ld_library_path ":${gccdir}/${mldir}"
	    }
	  }
	}

	set_ld_library_path_env_vars
	if [info exists env(LD_LIBRARY_PATH)] {
	  verbose -log "LD_LIBRARY_PATH = $env(LD_LIBRARY_PATH)"
	}
    } else {
	set compiler [transform "g++"]
    }

    # Set the default timeout for v3 tests.
    set tool_timeout 600

    # Default settings.
    set cxx [transform "g++"]
    set cxxflags "-g -O2 -D_GLIBCXX_ASSERT -fmessage-length=0"
    set cxxpchflags ""
    set cxxldflags ""
    set cc [transform "gcc"]
    # Locate testsuite_hooks.h and other testsuite headers.
    set includes "-I${srcdir}/util"
    # Adapt the defaults for special circumstances.
    if [is_remote host] {
	# A remote host does not, in general, have access to the
	# $srcdir so we copy the testsuite headers into the current
	# directory, and then add that to the search path.
	foreach src [glob "${srcdir}/util/*.h" \
		          "${srcdir}/util/*.cc" \
		          "${srcdir}/util/*.tcc" \
		          "${srcdir}/util/*.hpp" \
 		          "${srcdir}/util/*/*.h" \
		          "${srcdir}/util/*/*.cc" \
		          "${srcdir}/util/*/*.tcc" \
			  "${srcdir}/util/*/*.hpp" \
		          "${srcdir}/util/*/*/*.h" \
		          "${srcdir}/util/*/*/*.cc" \
		          "${srcdir}/util/*/*/*.tcc" \
			  "${srcdir}/util/*/*/*.hpp" \
		          "${srcdir}/util/*/*/*/*.h" \
		          "${srcdir}/util/*/*/*/*.cc" \
		          "${srcdir}/util/*/*/*/*.tcc" \
  			  "${srcdir}/util/*/*/*/*.hpp" \
		          "${srcdir}/util/*/*/*/*/*.h" \
		          "${srcdir}/util/*/*/*/*/*.cc" \
		          "${srcdir}/util/*/*/*/*/*.tcc" \
  			  "${srcdir}/util/*/*/*/*/*.hpp" ] {
	    # Remove everything up to "util/..."
	    set dst [string range $src [string length "${srcdir}/"] end]
	    # Create the directory containing the file.
	    set dir [file dirname $dst]
	    remote_exec host "mkdir" [list "-p" "$dir"]
	    # Download the file.
	    set result [remote_download host $src $dst]
	    if { $result == "" } {
		verbose -log "Unable to download ${srcdir}/${src} to host."
		return "untested"
	    }
	}
	set includes "-Iutil"
    } elseif { [file exists $flags_file] } {
        # If we find a testsuite_flags file, we're testing in the build dir.
	set cxx [exec sh $flags_file --build-cxx]
	set cxxflags [exec sh $flags_file --cxxflags]
	set cxxpchflags [exec sh $flags_file --cxxpchflags]
	set cxxldflags [exec sh $flags_file --cxxldflags]
	set cc [exec sh $flags_file --build-cc]
	set includes [exec sh $flags_file --build-includes]
    }
    append cxxflags " "
    append cxxflags [getenv CXXFLAGS]
    v3track cxxflags 2

    # Always use MO files built by this test harness.
    set cxxflags "$cxxflags -DLOCALEDIR=\".\""
    set ccflags "$cxxflags -DLOCALEDIR=\".\""

    # If a PCH file is available, use it.  We must delay performing
    # this check until $cxx and such have been initialized because we
    # perform a test compilation.  (Ideally, gcc --print-file-name would
    # list PCH files, but it does not.)
    if { $cxxpchflags != "" } {
	set src "config[pid].cc"
	set f [open $src "w"]
	puts $f "int main () {}"
	close $f

	# Fixme: "additional_flags=$cxxpchflags" fails, but would be
	# useful as then the requested variant of the pre-build PCH
	# files could be tested to see if it works.
	set lines [v3_target_compile $src "config[pid].o" object \
		   "additional_flags=-include additional_flags=bits/stdc++.h"]
	if { $lines != "" } {
	    verbose -log "Requested PCH file: $cxxpchflags"
	    verbose -log "is not working, and will not be used."
	    set cxxpchflags ""
	} 
	file delete $src
     } 
    v3track cxxpchflags 2

    global PCH_CXXFLAGS
    if ![info exists PCH_CXXFLAGS] then {
	set PCH_CXXFLAGS $cxxpchflags
	v3track PCH_CXXFLAGS 2
    }

    libstdc++_maybe_build_wrapper "${objdir}/testglue.o" "-fexceptions"
}

# Callback for cleanup routines.
proc libstdc++_exit { } {
    global gluefile;

    if [info exists gluefile] {
	file_on_build delete $gluefile;
	unset gluefile;
    }
}

# Callback from system dg-test.
proc libstdc++-dg-test { prog do_what extra_tool_flags } {
    # Set up the compiler flags, based on what we're going to do.
    switch $do_what {
        "preprocess" {
            set compile_type "preprocess"
            set output_file "[file rootname [file tail $prog]].i"
        }
        "compile" {
            set compile_type "assembly"
            set output_file "[file rootname [file tail $prog]].s"
        }
        "assemble" {
            set compile_type "object"
            set output_file "[file rootname [file tail $prog]].o"
        }
        "link" {
            set compile_type "executable"
            set output_file "./[file rootname [file tail $prog]].exe"
        }
        "run" {
            set compile_type "executable"
            # FIXME: "./" is to cope with "." not being in $PATH.
            # Should this be handled elsewhere?
            # YES.
            set output_file "./[file rootname [file tail $prog]].exe"
            # This is the only place where we care if an executable was
            # created or not.  If it was, dg.exp will try to run it.
            catch { remote_file build delete $output_file }
        }
	default {
            perror "$do_what: not a valid dg-do keyword"
            return ""
        }
    }

    # Short-circut a bunch of complicated goo here for the special
    # case of compiling a test file as a "C" file, not as C++. Why? So
    # -nostdc++ doesn't trip us up. So all the extra object files
    # don't trip us up. So automatically linking in libstdc++ doesn't
    # happen. So CXXFLAGS don't error.
    set select_compile "v3_target_compile"
    set options ""
    if { $extra_tool_flags != "" } {
	verbose -log "extra_tool_flags are:"
	verbose -log $extra_tool_flags
	if { [string first "-x c" $extra_tool_flags ] != -1 } {
	    verbose -log "compiling and executing as C, not C++"
	    set edit_tool_flags $extra_tool_flags
	    regsub -all ".x c" $edit_tool_flags "" edit_tool_flags
	    lappend options "additional_flags=$edit_tool_flags"
	    set select_compile "v3_target_compile_as_c"
        } else {
	    lappend options "additional_flags=$extra_tool_flags"
	}
    }

    # There is a libstdc++_compile made for us by default (via the tool-
    # and-target file), but the defaults are lacking in goodness.
    set comp_output [$select_compile "$prog" "$output_file" "$compile_type" $options];

    return [list $comp_output $output_file]
}

# Override the DejaGnu dg-test in order to clear flags after a test, as
# is done for compiler tests in gcc-dg.exp.

if { [info procs saved-dg-test] == [list] } {
    rename dg-test saved-dg-test

    proc dg-test { args } {
	global additional_prunes
	global errorInfo

	if { [ catch { eval saved-dg-test $args } errmsg ] } {
	    set saved_info $errorInfo
	    set additional_prunes ""
	    unset_timeout_vars
	    error $errmsg $saved_info
	}
	set additional_prunes ""
	unset_timeout_vars
    }
}

# True if the library supports wchar_t.
set v3-wchar_t 0

# True if the library supports threads.
set v3-threads 0

# True if the library supports symbol versioning.
set v3-symver 0

# Called from libstdc++-dg-test above.  Calls back into system's
# target_compile to actually do the work.
proc v3_target_compile { source dest type options } {
    global gluefile 
    global wrap_flags
    global cxx
    global cxxflags
    global cxxldflags
    global includes
    global STATIC_LIBCXXFLAGS

    if { [target_info needs_status_wrapper] != "" && [info exists gluefile] } {
        lappend options "libs=${gluefile}"
        lappend options "ldflags=${wrap_flags}"
    }

    set cxx_final $cxx
    set cxxlibglossflags  [libgloss_link_flags]
    set cxx_final [concat $cxx_final $cxxlibglossflags]
    set cxx_final [concat $cxx_final $STATIC_LIBCXXFLAGS]
    set cxx_final [concat $cxx_final $cxxflags]
    set cxx_final [concat $cxx_final $includes]

    # Flag setting based on type argument.
    if { $type == "executable" } {
	# Link the support objects into executables.
	lappend options "additional_flags=./libtestc++.a $cxxldflags"
    } else {
	if { $type == "sharedlib" } {
	    # Don't link in anything.
	    set type "executable"
	}
    }

    lappend options "compiler=$cxx_final"
    lappend options "timeout=[timeout_value]"

    return [target_compile $source $dest $type $options]
}


# Called from libstdc++-dg-test above, but only for "C" compilation.
# Calls back into system's target_compile to actually do the work.
proc v3_target_compile_as_c { source dest type options } {
    global gluefile 
    global wrap_flags
    global includes
    global flags_file
    global blddir
    global cc
    global cxxflags
    global STATIC_LIBCXXFLAGS

    if { [target_info needs_status_wrapper] != "" && [info exists gluefile] } {
        lappend options "libs=${gluefile}"
        lappend options "ldflags=${wrap_flags}"
    }

    set tname [target_info name]
    set cc_final $cc
    set cxxlibglossflags [libgloss_link_flags]
    set cc_final [concat $cc_final $cxxlibglossflags]
    set cc_final [concat $cc_final $STATIC_LIBCXXFLAGS]
    set cc_final [concat $cc_final $cxxflags]
    set cc_final [concat $cc_final $includes]
    regsub -all {\s[-]nostdinc[+][+]} $cc_final "" cc_final

    # This is needed for "C" tests, as this type of test may need the
    # C++ includes. And if we're not testing in the build directory,
    # the includes variable is not likely to include the necessary
    # info.
    if { ![file exists $flags_file] } {
	# ??? We need a --print-include-dirs option to GCC, so that
	# we can avoid these hacks.  The heuristics here will not
	# work with non-standard --with-includedir= options.
	set version [remote_exec host ${cc} -dumpversion]
	# Remove the trailing newline from the output.
	set version [string trimright [lindex $version 1]]
	set machine [remote_exec host ${cc} -dumpmachine]
	set machine [string trimright [lindex $machine 1]]
	set comp_base_dir [remote_exec host ${cc} --print-prog-name=cc1]
	set comp_base_dir [lindex $comp_base_dir 1]
	set comp_base_dir [file dirname [file dirname [file dirname [file dirname [file dirname $comp_base_dir]]]]]
	# For a cross compiler, the header files will be located in a
	# machine-specific subdirectory.
	set crossbase "${comp_base_dir}/${machine}/include/c++/${version}"
	set crosstarget "${crossbase}/${machine}"
	set cc_final [concat $cc_final "-I$crossbase -I$crosstarget"]
	# For a native compiler, the header files will be located at 
	# the top level.
	set includesbase "${comp_base_dir}/include/c++/${version}"
	set includestarget "${includesbase}/${machine}"
	set cc_final [concat $cc_final "-I$includesbase -I$includestarget"]

        set libdir "-L${comp_base_dir}/lib"
    } else {
        set libdir "-L${blddir}/libsupc++/.libs"
	set libdir [concat $libdir "-L${blddir}/src/.libs"]
    }

    set cc_final [concat $cc_final "$libdir"]

    lappend options "compiler=$cc_final"
    lappend options "timeout=[timeout_value]"

    return [target_compile $source $dest $type $options]
}

# Build the support objects linked in with the libstdc++ tests.  In
# addition, set v3-wchar_t, v3-threads, and v3-symver appropriately.
proc v3-build_support { } {
    global env
    global srcdir
    global v3-wchar_t
    global v3-threads
    global v3-symver
    global v3-sharedlib

    # Figure out whether or not the library supports certain features.
    set v3-wchar_t 0
    set v3-threads 0
    set v3-symver 0
    set libtest_objs ""

    set config_src "config.cc"
    set config_out "config.ii"
    set f [open $config_src "w"]
    puts $f "#include <bits/c++config.h>"
    puts $f "#include <bits/gthr.h>"
    close $f
    v3_target_compile $config_src $config_out preprocess "additional_flags=-dN"
    set file [open $config_out r]
    set preprocessed [read $file]
    close $file
    if { [string first "_GLIBCXX_USE_WCHAR_T" $preprocessed] != -1 } {
	verbose -log "wchar_t support detected"
	set v3-wchar_t 1
    }
    if { [string first "_GLIBCXX_SYMVER" $preprocessed] != -1 } {
	verbose -log "symbol versioning support detected"
	set v3-symver 1
    }
    if { [string first "__GTHREADS" $preprocessed] != -1 } {
	verbose -log "thread support detected"
	set v3-threads 1
    }

    # Try to build the MO files that are used by some of the locale
    # tests.  If we can't build them, that's OK; it just means that
    # those tests will fail.
    foreach lang [list "fr" "de"] {
	catch {
	    file mkdir "$lang/LC_MESSAGES"
	    remote_exec "build" "msgfmt" "-o $lang/LC_MESSAGES/libstdc++.mo $srcdir/../po/$lang.po"
	    if [is_remote host] {
		remote_exec "host" "mkdir" "-p $lang/LC_MESSAGES"
		remote_download "host" "$lang/LC_MESSAGES/libstdc++.mo" "$lang/LC_MESSAGES/libstdc++.mo"
	    }
	}
    }

    # Build the support objects.
    set source_files [list testsuite_abi.cc testsuite_allocator.cc \
			  testsuite_character.cc testsuite_hooks.cc \
	       	          io/verified_cmd_line_input.cc \
			  io/prog_bar.cc performance/time/elapsed_timer.cc ]
    foreach f $source_files {
	set obj [file rootname $f].o
	set object_file [file tail $obj]
	# Compile with "-w" so that warnings issued by the compiler
	# do not prevent compilation.
	if { [v3_target_compile $srcdir/util/$f $object_file "object" \
		  [list "incdir=$srcdir" "additional_flags=-w"]]
	     != "" } {
	    error "could not compile $f"
	}
	append libtest_objs "$object_file "
    }

    # Collect into libtestc++.a
    # Delete libtestc++.a first.  Mixed 32 and 64-bit archives cannot be
    # linked on IRIX 6.
    # Use same procedure as gcc-dg.exp (remove-build-file).
    if [is_remote host] {
	# Ensure the host knows the file is gone by deleting there
	# first.
	remote_file host delete "./libtestc++.a"
	}
    remote_file build delete "./libtestc++.a"
    if  [info exists env(AR)] {
	set ar $env(AR)
    } else {
	set ar [transform "ar"]
    }
    set arargs "-rc ./libtestc++.a ${libtest_objs}"
    verbose -log "$ar $arargs"
    set result [lindex [remote_exec host "$ar" "$arargs"] 0]
    verbose "link result is $result"
    if { $result == 0 } {
	if  [info exists env(RANLIB)] {
	    set ranlib $env(RANLIB)
	} else {
	    set ranlib [transform "ranlib"]
	}
	set ranlibargs "./libtestc++.a"
	verbose -log "$ranlib $ranlibargs"
	set result [lindex [remote_exec host "$ranlib" "$ranlibargs"] 0]
	if { $result != 0 } {
	    error "could not link libtestc++.a"
	}
    }

    # Build any shared objects needed for regression testing.
    if { ${v3-sharedlib} == 1 } {
	set source_files [list testsuite_shared.cc]
	foreach f $source_files {
	    set object_file [file rootname $f].so
	    # Compile with "-w" so that warnings issued by the compiler
	    # do not prevent compilation.
	    if { [v3_target_compile $srcdir/util/$f $object_file "sharedlib" \
	     [list "incdir=$srcdir" "additional_flags=-w -shared -fPIC -DPIC"]]
		 != "" } {
		error "could not compile $f"
	    }
	}
    }
}

proc check_v3_target_fileio { } {
    global et_fileio_saved
    global et_fileio_target_name
    global tool	
    global srcdir

    if { ![info exists et_fileio_target_name] } {
	set et_fileio_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_fileio_target_name } {
	verbose "check_v3_target_fileio: `$et_fileio_target_name'" 2
	set et_fileio_target_name $current_target
	if [info exists et_fileio_saved] {
	    verbose "check_v3_target_fileio: removing cached result" 2
	    unset et_fileio_saved
	}
    }

    if [info exists et_fileio_saved] {
	verbose "check_v3_target_fileio: using cached result" 2
    } else {
	set et_fileio_saved 0

	# Set up, compile, and execute a C++ test program that tries to use
	# the file functions
	set src fileio[pid].cc
	set exe fileio[pid].x
	set testfile "cin_unget-1.txt"
	v3-copy-files "$srcdir/data/$testfile"

	set f [open $src "w"]
	puts $f "#include <sys/types.h>"
	puts $f "#include <sys/stat.h>"
	puts $f "#include <fcntl.h>"
	puts $f "#include <unistd.h>"
	puts $f "#include <errno.h>"
	puts $f "#include <string.h>"
	puts $f "using namespace std;"	
	puts $f "int main ()"
	puts $f "{"
	puts $f "  int fd  = open (\"$testfile\", O_RDONLY);"
	puts $f "  int ret = 0;"
	puts $f "  char buf\[10\];"
	puts $f "  if (fd == -1)"
	puts $f "    ret = 1;"
	puts $f "  else"
	puts $f "  {"
	puts $f "    if (lseek (fd, -1, SEEK_CUR) != -1 || errno != EINVAL)"
	puts $f "      ret = 1;"
	puts $f "    errno = 0;"
	puts $f "    if (lseek (fd, 0, SEEK_CUR) != 0"
	puts $f "        || read (fd, buf, 4) != 4"
	puts $f "        || memcmp (buf, \"1234\", 4) != 0"
	puts $f "        || lseek (fd, -2, SEEK_CUR) != 2"
	puts $f "        || read (fd, buf, 2) != 2"
	puts $f "        || memcmp (buf, \"34\", 2) != 0)"
	puts $f "      ret = 1;"
	puts $f "    close (fd);"
	puts $f "  }"
	puts $f "  return ret;"
	puts $f "}" 
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    set result [${tool}_load "./$exe" "" ""]
	    set status [lindex $result 0]
	    remote_file build delete $exe

	    verbose "check_v3_target_fileio: status is <$status>" 2

	    if { $status == "pass" } {
		set et_fileio_saved 1
	    }
	} else {
	    verbose "check_v3_target_fileio: compilation failed" 2
	}
    }
    return $et_fileio_saved
}

# Eventually we want C90/C99 determining and switching from this.
proc check_v3_target_c_std { } {
    global et_c_std_saved
    global et_c_std_target_name
    global tool	

    if { ![info exists et_c_std_target_name] } {
	set et_c_std_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_c_std_target_name } {
	verbose "check_v3_target_c_std: `$et_c_std_target_name'" 2
	set et_c_std_target_name $current_target
	if [info exists et_c_std_saved] {
	    verbose "check_v3_target_c_std: removing cached result" 2
	    unset et_c_std_saved
	}
    }

    if [info exists et_c_std_saved] {
	verbose "check_v3_target_c_std: using cached result" 2
    } else {
	set et_c_std_saved 0

	# Set up, compile, and execute a C++ test program that tries to use
	# C99 functionality.
        # For math bits, could use check_effective_target_c99_math.
	set src fileio[pid].cc
	set exe fileio[pid].x

	set f [open $src "w"]
	puts $f "#include <tr1/cmath>"
	puts $f "#include <cstdlib>"
	puts $f "int main ()"
	puts $f "{"
	puts $f "  float f = 45.55;"
	puts $f "  int i = std::tr1::isnan(f);"
	puts $f "  "
	puts $f "  using std::wctomb;"
	puts $f "  return i;"
	puts $f "}" 
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    set result [${tool}_load "./$exe" "" ""]
	    set status [lindex $result 0]
	    remote_file build delete $exe

	    verbose "check_v3_target_c_std: status is <$status>" 2

	    if { $status == "pass" } {
		set et_c_std_saved 1
	    }
	} else {
	    verbose "check_v3_target_c_std: compilation failed" 2
	}
    }
    return $et_c_std_saved
}

proc check_v3_target_sharedlib { } {
    global v3-sharedlib
    return ${v3-sharedlib}
}

proc check_v3_target_time { } {
    global et_time_saved
    global et_time_target_name
    global tool	

    if { ![info exists et_time_target_name] } {
	set et_time_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_time_target_name } {
	verbose "check_v3_target_time: `$et_time_target_name'" 2
	set et_time_target_name $current_target
	if [info exists et_time_saved] {
	    verbose "check_v3_target_time: removing cached result" 2
	    unset et_time_saved
	}
    }

    if [info exists et_time_saved] {
	verbose "check_v3_target_time: using cached result" 2
    } else {
	set et_time_saved 0

	# Set up and compile a C++ test program that tries to use
	# the time function
	set src time[pid].cc
	set exe time[pid].x

	set f [open $src "w"]
	puts $f "#include <time.h>"
	puts $f "using namespace std;"	
	puts $f "int main ()"
	puts $f "{"
	puts $f "  time (0);"	
	puts $f "}" 
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    verbose "check_v3_target_time: compilation succeeded" 2
	    remote_file build delete $exe
	    set et_time_saved 1
	} else {
	    verbose "check_v3_target_time: compilation failed" 2
	}
    }
    return $et_time_saved
}

proc check_v3_target_namedlocale { args } {
    global et_namedlocale
    global tool	

    set et_namedlocale 0

    # Set up, compile, and execute a C++ test program that tries to use
    # the required named locale.
    set exe nlocale[pid].x

    if ![file exists ./$exe] {
      set src nlocale[pid].cc

      set f [open $src "w"]
      puts $f "#include <locale>"
      puts $f "#include <cstdio>"
      puts $f "using namespace std;"	
      puts $f "int main (int argc, char** argv)"
      puts $f "{"
      puts $f "  try"	
      puts $f "  {"
      puts $f "    locale(*(argv + 1));"
      puts $f "    return 0;"
      puts $f "  }"
      puts $f "  catch(...)"
      puts $f "  {"
      puts $f "    printf(\"locale '%s' not supported\\n\", *(argv + 1));"
      puts $f "    return 1;"
      puts $f "  }"	
      puts $f "}"
      close $f

      set lines [v3_target_compile $src $exe executable ""]
      file delete $src

      if ![string match "" $lines] {
        verbose "check_v3_target_namedlocale: compilation failed" 2
        return $et_namedlocale
      }
      # else No error message, compilation succeeded.
    }
	
    set result [${tool}_load "./$exe" "$args" ""]
    set status [lindex $result 0]

    verbose "check_v3_target_namedlocale <$args>: status is <$status>" 2

    if { $status == "pass" } {
      set et_namedlocale 1
    }
    return $et_namedlocale
}

proc check_v3_target_debug_mode { } {
    global et_debug_mode
    global tool	

    if { ![info exists et_debug_mode_target_name] } {
	set et_debug_mode_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_debug_mode_target_name } {
	verbose "check_v3_target_debug_mode: `$et_debug_mode_target_name'" 2
	set et_debug_mode_target_name $current_target
	if [info exists et_debug_mode] {
	    verbose "check_v3_target_debug_mode: removing cached result" 2
	    unset et_debug_mode
	}
    }

    if [info exists et_debug_mode] {
	verbose "check_v3_target_debug_mode: using cached result" 2
    } else {
	set et_debug_mode 0

	# Set up and compile a C++ test program that depends
	# on debug mode activated.
	set src debug_mode[pid].cc
	set exe debug_mode[pid].exe

	set f [open $src "w"]
	puts $f "#ifndef _GLIBCXX_DEBUG"
	puts $f "#  error No debug mode"
	puts $f "#endif"
	puts $f "int main()"
	puts $f "{ return 0; }"
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    remote_file build delete $exe
	    set et_debug_mode 1
	}
    }
    verbose "check_v3_target_debug_mode: $et_debug_mode" 2
    return $et_debug_mode
}

proc check_v3_target_profile_mode { } {
    global et_profile_mode
    global tool	

    if { ![info exists et_profile_mode_target_name] } {
	set et_profile_mode_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_profile_mode_target_name } {
	verbose "check_v3_target_profile_mode: `$et_profile_mode_target_name'" 2
	set et_profile_mode_target_name $current_target
	if [info exists et_profile_mode] {
	    verbose "check_v3_target_profile_mode: removing cached result" 2
	    unset et_profile_mode
	}
    }

    if [info exists et_profile_mode] {
	verbose "check_v3_target_profile_mode: using cached result" 2
    } else {
	set et_profile_mode 0

	# Set up and compile a C++ test program that depends
	# on profile mode activated.
	set src profile_mode[pid].cc
	set exe profile_mode[pid].exe

	set f [open $src "w"]
	puts $f "#ifndef _GLIBCXX_PROFILE"
	puts $f "#  error No profile mode"
	puts $f "#endif"
	puts $f "int main()"
	puts $f "{ return 0; }"
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    remote_file build delete $exe
	    set et_profile_mode 1
	}
    }
    verbose "check_v3_target_profile_mode: $et_profile_mode" 2
    return $et_profile_mode
}

proc check_v3_target_normal_mode { } {
    global et_normal_mode
    global tool	

    if { ![info exists et_normal_mode_target_name] } {
	set et_normal_mode_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_normal_mode_target_name } {
	verbose "check_v3_target_normal_mode: `$et_normal_mode_target_name'" 2
	set et_normal_mode_target_name $current_target
	if [info exists et_normal_mode] {
	    verbose "check_v3_target_normal_mode: removing cached result" 2
	    unset et_normal_mode
	}
    }

    if [info exists et_normal_mode] {
	verbose "check_v3_target_normal_mode: using cached result" 2
    } else {
	set et_normal_mode 0

	# Set up and compile a C++ test program that depends
	# on normal mode activated.
	set src normal_mode[pid].cc
	set exe normal_mode[pid].exe

	set f [open $src "w"]
	puts $f "#if defined(_GLIBCXX_DEBUG) || defined(_GLIBCXX_PROFILE) || defined(_GLIBCXX_PARALLEL)"
	puts $f "#  error No normal mode"
	puts $f "#endif"
	puts $f "int main()"
	puts $f "{ return 0; }"
	close $f

	set lines [v3_target_compile $src $exe executable ""]
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    set et_normal_mode 1
	}
    }
    verbose "check_v3_target_normal_mode: $et_normal_mode" 2
    return $et_normal_mode
}

proc check_v3_target_parallel_mode { } {
    global cxxflags
    global v3-libgomp
    global et_parallel_mode

    global tool	

    if { ![info exists et_parallel_mode_target_name] } {
	set et_parallel_mode_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_parallel_mode_target_name } {
	verbose "check_v3_target_parallel_mode: `$et_parallel_mode_target_name'" 2
	set et_parallel_mode_target_name $current_target
	if [info exists et_parallel_mode] {
	    verbose "check_v3_target_parallel_mode: removing cached result" 2
	    unset et_parallel_mode
	}
    }

    if [info exists et_parallel_mode] {
	verbose "check_v3_target_parallel_mode: using cached result" 2
    } else {
	set et_parallel_mode 0

	# If 'make check-parallel' is running the test succeeds.
	if { ${v3-libgomp} == 1 && [regexp "libgomp" $cxxflags] } {
	    set et_parallel_mode 1
	}
    }
    verbose "check_v3_target_parallel_mode: $et_parallel_mode" 2
    return $et_parallel_mode
}

proc check_v3_target_cstdint { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_cstdint

    global tool	

    if { ![info exists et_cstdint_target_name] } {
	set et_cstdint_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_cstdint_target_name } {
	verbose "check_v3_target_cstdint: `$et_cstdint_target_name'" 2
	set et_cstdint_target_name $current_target
	if [info exists et_cstdint] {
	    verbose "check_v3_target_cstdint: removing cached result" 2
	    unset et_cstdint
	}
    }

    if [info exists et_cstdint] {
	verbose "check_v3_target_cstdint: using cached result" 2
    } else {
	set et_cstdint 0

	# Set up and compile a C++0x test program that depends
	# on the C99 stdint facilities to be available.
	set src cstdint[pid].cc
	set exe cstdint[pid].exe

	set f [open $src "w"]
	puts $f "#include <tr1/cstdint>"
	puts $f "int main()"
	puts $f "#ifdef _GLIBCXX_USE_C99_STDINT_TR1"
	puts $f "{ return 0; }"
	puts $f "#endif"
	close $f

	set cxxflags_saved $cxxflags
	set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

	set lines [v3_target_compile $src $exe executable ""]
	set cxxflags $cxxflags_saved
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    set et_cstdint 1
	} else {
	    verbose "check_v3_target_cstdint: compilation failed" 2
	}
    }
    verbose "check_v3_target_cstdint: $et_cstdint" 2
    return $et_cstdint
}

proc check_v3_target_atomic_builtins { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_cstdint

    global tool	

    if { ![info exists et_atomic_builtins_target_name] } {
	set et_atomic_builtins_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_atomic_builtins_target_name } {
	verbose "check_v3_target_atomic_builtins: `$et_atomic_builtins_target_name'" 2
	set et_atomic_builtins_target_name $current_target
	if [info exists et_atomic_builtins] {
	    verbose "check_v3_target_atomic_builtins: removing cached result" 2
	    unset et_atomic_builtins
	}
    }

    if [info exists et_atomic_builtins] {
	verbose "check_v3_target_atomic_builtins: using cached result" 2
    } else {
	set et_atomic_builtins 0

	# Set up and compile a C++0x test program that depends
	# on the atomic builtin facilities to be available.
	set src atomic_builtins[pid].cc
	set exe atomic_builtins[pid].exe

	set f [open $src "w"]
	puts $f "#include <bits/c++config.h>"
	puts $f "int main()"
	puts $f "#ifdef _GLIBCXX_ATOMIC_BUILTINS_4"
	puts $f "{ return 0; }"
	puts $f "#endif"
	close $f

	set cxxflags_saved $cxxflags
	set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

	set lines [v3_target_compile $src $exe executable ""]
	set cxxflags $cxxflags_saved
	file delete $src

	if [string match "" $lines] {
	    # No error message, compilation succeeded.
	    set et_atomic_builtins 1
	} else {
	    verbose "check_v3_target_atomic_builtins: compilation failed" 2
	}
    }
    verbose "check_v3_target_atomic_builtins: $et_atomic_builtins" 2
    return $et_atomic_builtins
}

proc check_v3_target_gthreads { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_gthreads

    global tool

    if { ![info exists et_gthreads_target_name] } {
        set et_gthreads_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_gthreads_target_name } {
        verbose "check_v3_target_gthreads: `$et_gthreads_target_name'" 2
        set et_gthreads_target_name $current_target
        if [info exists et_gthreads] {
            verbose "check_v3_target_gthreads: removing cached result" 2
            unset et_gthreads
        }
    }

    if [info exists et_gthreads] {
        verbose "check_v3_target_gthreads: using cached result" 2
    } else {
        set et_gthreads 0

        # Set up and compile a C++0x test program that depends
        # on the gthreads facilities to be available.
        set src gthreads[pid].cc
        set exe gthreads[pid].exe

        set f [open $src "w"]
	puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#ifdef _GLIBCXX_HAS_GTHREADS"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_gthreads 1
        } else {
            verbose "check_v3_target_gthreads: compilation failed" 2
        }
    }
    verbose "check_v3_target_gthreads: $et_gthreads" 2
    return $et_gthreads
}

proc check_v3_target_nanosleep { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_nanosleep

    global tool

    if { ![info exists et_nanosleep_target_name] } {
        set et_nanosleep_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_nanosleep_target_name } {
        verbose "check_v3_target_nanosleep: `$et_nanosleep_target_name'" 2
        set et_nanosleep_target_name $current_target
        if [info exists et_nanosleep] {
            verbose "check_v3_target_nanosleep: removing cached result" 2
            unset et_nanosleep
        }
    }

    if [info exists et_nanosleep] {
        verbose "check_v3_target_nanosleep: using cached result" 2
    } else {
        set et_nanosleep 0
	
	# Set up and compile a C++0x test program that depends
        # on the nanosleep facilities to be available.
        set src nanosleep[pid].cc
        set exe nanosleep[pid].exe

        set f [open $src "w"]
        puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#ifdef _GLIBCXX_USE_NANOSLEEP"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_nanosleep 1
        } else {
            verbose "check_v3_target_nanosleep: compilation failed" 2
        }
    }
    verbose "check_v3_target_nanosleep: $et_nanosleep" 2
    return $et_nanosleep
}

proc check_v3_target_sched_yield { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_sched_yield

    global tool

    if { ![info exists et_sched_yield_target_name] } {
        set et_sched_yield_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_sched_yield_target_name } {
        verbose "check_v3_target_sched_yield: `$et_sched_yield_target_name'" 2
        set et_sched_yield_target_name $current_target
        if [info exists et_sched_yield] {
            verbose "check_v3_target_sched_yield: removing cached result" 2
            unset et_sched_yield
        }
    }

    if [info exists et_sched_yield] {
        verbose "check_v3_target_sched_yield: using cached result" 2
    } else {
        set et_sched_yield 0

        # Set up and compile a C++0x test program that depends
        # on the sched_yield facility to be available.
        set src sched_yield[pid].cc
        set exe sched_yield[pid].exe

        set f [open $src "w"]
        puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#ifdef _GLIBCXX_USE_SCHED_YIELD"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_sched_yield 1
        } else {
            verbose "check_v3_target_sched_yield: compilation failed" 2
        }
    }
    verbose "check_v3_target_sched_yield: $et_sched_yield" 2
    return $et_sched_yield
}

proc check_v3_target_string_conversions { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_string_conversions

    global tool

    if { ![info exists et_string_conversions_target_name] } {
        set et_string_conversions_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_string_conversions_target_name } {
        verbose "check_v3_target_string_conversions: `$et_string_conversions_target_name'" 2
        set et_string_conversions_target_name $current_target
        if [info exists et_string_conversions] {
            verbose "check_v3_target_string_conversions: removing cached result" 2
            unset et_string_conversions
        }
    }

    if [info exists et_string_conversions] {
        verbose "check_v3_target_string_conversions: using cached result" 2
    } else {
        set et_string_conversions 0
	
	# Set up and compile a C++0x test program that depends
        # on the string_conversions facilities to be available.
        set src string_conversions[pid].cc
        set exe string_conversions[pid].exe

        set f [open $src "w"]
        puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#if defined(_GLIBCXX_USE_C99) && !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF)"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_string_conversions 1
        } else {
            verbose "check_v3_target_string_conversions: compilation failed" 2
        }
    }
    verbose "check_v3_target_string_conversions: $et_string_conversions" 2
    return $et_string_conversions
}

proc check_v3_target_swprintf { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_swprintf

    global tool

    if { ![info exists et_swprintf_target_name] } {
        set et_swprintf_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_swprintf_target_name } {
        verbose "check_v3_target_swprintf: `$et_swprintf_target_name'" 2
        set et_swprintf_target_name $current_target
        if [info exists et_swprintf] {
            verbose "check_v3_target_swprintf: removing cached result" 2
            unset et_swprintf
        }
    }

    if [info exists et_swprintf] {
        verbose "check_v3_target_swprintf: using cached result" 2
    } else {
        set et_swprintf 0
	
	# Set up and compile a C++0x test program that depends
        # on a standard swprintf function to be available.
        set src swprintf[pid].cc
        set exe swprintf[pid].exe

        set f [open $src "w"]
        puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#if !defined(_GLIBCXX_HAVE_BROKEN_VSWPRINTF)"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_swprintf 1
        } else {
            verbose "check_v3_target_swprintf: compilation failed" 2
        }
    }
    verbose "check_v3_target_swprintf: $et_swprintf" 2
    return $et_swprintf
}

proc check_v3_target_binary_io { } {
    global cxxflags
    global DEFAULT_CXXFLAGS
    global et_binary_io

    global tool

    if { ![info exists et_binary_io_target_name] } {
        set et_binary_io_target_name ""
    }

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_binary_io_target_name } {
        verbose "check_v3_target_binary_io: `$et_binary_io_target_name'" 2
        set et_binary_io_target_name $current_target
        if [info exists et_binary_io] {
            verbose "check_v3_target_binary_io: removing cached result" 2
            unset et_binary_io
        }
    }

    if [info exists et_binary_io] {
        verbose "check_v3_target_binary_io: using cached result" 2
    } else {
        set et_binary_io 0
	
	# Set up and compile a C++0x test program that depends
        # on text and binary I/O being the same.
        set src binary_io[pid].cc
        set exe binary_io[pid].exe

        set f [open $src "w"]
        puts $f "#include <bits/c++config.h>"
        puts $f "int main()"
        puts $f "#if !defined(_GLIBCXX_HAVE_DOS_BASED_FILESYSTEM)"
        puts $f "{ return 0; }"
        puts $f "#endif"
        close $f

        set cxxflags_saved $cxxflags
        set cxxflags "$cxxflags $DEFAULT_CXXFLAGS -Werror"

        set lines [v3_target_compile $src $exe executable ""]
        set cxxflags $cxxflags_saved
        file delete $src

        if [string match "" $lines] {
            # No error message, compilation succeeded.
            set et_binary_io 1
        } else {
            verbose "check_v3_target_binary_io: compilation failed" 2
        }
    }
    verbose "check_v3_target_binary_io: $et_binary_io" 2
    return $et_binary_io
}

set additional_prunes ""