libstdc++.exp

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    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 $cxxflags]
    set cxx_final [concat $cxx_final $includes]

    # Flag setting based on type argument.
    if { $type == "executable" } {
	# Link the support objects into executables.
	set cxx_final [concat $cxx_final ${v3-test_objs}]
    } else {
	if { $type == "sharedlib" } {
	    # Don't link in anything.
	    set type "executable"
	}
    }

    lappend options "compiler=$cxx_final"

    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, v3-test_objs, and v3-symver
# appropriately.
proc v3-build_support { } {
    global srcdir
    global v3-wchar_t
    global v3-threads
    global v3-test_objs
    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 v3-test_objs ""

    set config_src "config.cc"
    set f [open $config_src "w"]
    puts $f "#include <bits/c++config.h>"
    puts $f "#include <bits/gthr.h>"
    close $f
    set preprocessed [v3_target_compile $config_src "" \
	    	       preprocess "additional_flags=-dN"]
    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
    }

    # Build the support objects.
    set source_files \
	[list testsuite_abi.cc testsuite_allocator.cc testsuite_character.cc testsuite_hooks.cc ]
    foreach f $source_files {
	set object_file [file rootname $f].o
	# Compile with "-w" so that warnings issued by the compiler
	# do not prevent compilation.
	if { [v3_target_compile $srcdir/$f $object_file "object" \
		  [list "incdir=$srcdir" "additional_flags=-w"]]
	     != "" } {
	    error "could not compile $f"
	}
	append v3-test_objs "$object_file "
    }

    # Build the shared support objects.
    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 $srcdir/$f $object_file "sharedlib" \
	     [list "incdir=$srcdir" "additional_flags=-w -shared -fPIC -DPIC"]]
		 != "" } {
		error "could not compile $f"
	    }
	}
    }
}

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

proc check_v3_target_namedlocale { } {
    global et_namedlocale_saved
    global et_namedlocale_target_name
    global tool	

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

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_namedlocale_target_name } {
	verbose "check_v3_target_namedlocale: `$et_namedlocale_target_name'" 2
	set et_namedlocale_target_name $current_target
	if [info exists et_namedlocale_saved] {
	    verbose "check_v3_target_namedlocale: removing cached result" 2
	    unset et_namedlocale_saved
	}
    }

    if [info exists et_namedlocale_saved] {
	verbose "check_v3_target_namedlocale: using cached result" 2
    } else {
	set et_namedlocale_saved 0

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

	set f [open $src "w"]
	puts $f "#include <locale>"
	puts $f "using namespace std;"	
	puts $f "int main ()"
	puts $f "{"
	puts $f "  try"	
	puts $f "  {" 
	puts $f "     locale(\"\");"
	puts $f "     locale(\"de_DE\");"
	puts $f "     locale(\"de_DE.ISO-8859-15@euro\");"
	puts $f "     locale(\"de_DE@euro\");"
	puts $f "     locale(\"en_HK\");"
	puts $f "     locale(\"en_PH\");"
	puts $f "     locale(\"en_US\");"
	puts $f "     locale(\"en_US.ISO-8859-1\");"
	puts $f "     locale(\"en_US.ISO-8859-15\");"
	puts $f "     locale(\"en_US.UTF-8\");"
	puts $f "     locale(\"es_ES\");"
	puts $f "     locale(\"es_MX\");"
	puts $f "     locale(\"fr_FR\");"
	puts $f "     locale(\"fr_FR@euro\");"
	puts $f "     locale(\"is_IS\");"
	puts $f "     locale(\"is_IS.UTF-8\");"
	puts $f "     locale(\"it_IT\");"
	puts $f "     locale(\"ja_JP.eucjp\");"
	puts $f "     locale(\"se_NO.UTF-8\");"
	puts $f "     locale(\"ta_IN\");"
	puts $f "     locale(\"zh_TW\");"
	puts $f "     return 0;"
	puts $f "  }"
	puts $f "  catch(...)"
	puts $f "  {"
	puts $f "     return 1;"
	puts $f "  }"	
	puts $f "}"
	close $f

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

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

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

	    if { $status == "pass" } {
		set et_namedlocale_saved 1
	    }
	} else {
	    verbose "check_v3_target_namedlocale: compilation failed" 2
	}
    }
    return $et_namedlocale_saved
}

proc check_v3_target_cxa_atexit { } {
    global et_cxa_atexit
    global et_cxa_atexit_target_name
    global tool	

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

    # If the target has changed since we set the cached value, clear it.
    set current_target [current_target_name]
    if { $current_target != $et_cxa_atexit_target_name } {
	verbose "check_v3_target_cxa_atexit: `$et_cxa_atexit_target_name'" 2
	set et_cxa_atexit_target_name $current_target
	if [info exists et_cxa_atexit] {
	    verbose "check_v3_target_cxa_atexit: removing cached result" 2
	    unset et_cxa_atexit
	}
    }

    if [info exists et_cxa_atexit] {
	verbose "check_v3_target_cxa_atexit: using cached result" 2
    } else {
	set et_cxa_atexit 0

	# Set up, compile, and execute a C++ test program that depends
	# on correct ordering of static object destructors. This is
	# indicative of the presence and use of __cxa_atexit.
	set src cxaatexit[pid].cc
	set exe cxaatexit[pid].x

	set f [open $src "w"]
	puts $f "#include <stdlib.h>"
	puts $f "static unsigned int count;"
	puts $f "struct X"
	puts $f "{"
	puts $f "  X() { count = 1; }"
	puts $f "  ~X()"
	puts $f "  {"
	puts $f "    if (count != 3)"
	puts $f "      exit(1);"
	puts $f "    count = 4;"
        puts $f "  }"
        puts $f "};"
	puts $f "void f()"
	puts $f "{"
	puts $f "  static X x;"
        puts $f "}"
	puts $f "struct Y"
	puts $f "{"
	puts $f "  Y() { f(); count = 2; }"
	puts $f "  ~Y()"
	puts $f "  {"
	puts $f "    if (count != 2)"
	puts $f "      exit(1);"
	puts $f "    count = 3;"
        puts $f "  }"
        puts $f "};"
	puts $f "Y y;"
	puts $f "int main()"
	puts $f "{ return 0; }"
	close $f

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

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

	    verbose "check_v3_target_cxa_atexit: status is <$status>" 2

	    if { $status == "pass" } {
		set et_cxa_atexit 1
	    }
	} else {
	    verbose "check_v3_target_cxa_atexit: compilation failed" 2
	}
    }
    return $et_cxa_atexit
}

proc check_v3_target_debug_mode { } {
    global cxxflags
    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, compile, and execute a C++ test program that depends
	# on debug mode working.
	set src debug_mode[pid].cc
	set exe debug_mode[pid].exe

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

	set cxxflags_saved $cxxflags
	set cxxflags "$cxxflags -Werror -O0 -D_GLIBCXX_DEBUG"
	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_debug_mode 1
	}
    }
    verbose "check_v3_target_debug_mode: $et_debug_mode" 2
    return $et_debug_mode
}