# Copyright (C) 1992-2016 Free Software Foundation, Inc.
#
# This file is part of DejaGnu.
#
# DejaGnu 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.
#
# DejaGnu 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 DejaGnu; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
# This file was written by Rob Savoye <rob@welcomehome.org>.
# this contains a list of gcc options and their respective directories.
# Find the pieces of libgloss for testing the GNU development tools
# needed to link a set of object files into an executable.
# This usually means setting the -L and -B paths correctly.
#
proc libgloss_link_flags { args } {
global target_cpu
global srcdir
# libgloss doesn't work native
if {[isnative]} {
return ""
}
# if we're on a remote host, we can't search for the file, so we can only
# use an installed compiler, so we don't add any paths here.
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
# map the target_cpu to the proper libgloss directory. unfortunately, these
# directory names are hardcoded into libgloss.
switch -glob -- $target_cpu {
"sparc86x" {
set cpu sparc
}
"sparclite" {
set cpu sparc
}
"sparclet" {
set cpu sparc
}
"sparc64*" {
set cpu sparc
}
"hppa*" {
set cpu pa
}
"mips*" {
set cpu mips
}
"powerpc*" {
set cpu rs6000
}
"d10v*" {
set cpu libnosys
}
"xscale*" {
set cpu arm
}
"aarch64*" {
set cpu aarch64
}
default {
set cpu $target_cpu
}
}
set gloss_srcdir ""
# look for the libgloss srcdir sp we can find the linker scripts
set gloss_srcdir [lookfor_file ${srcdir} libgloss/$cpu]
# set the proper paths for gcc if the target subdir exists, else assume we
# have no libgloss support for this target.
if { $gloss_srcdir == "" } {
return ""
}
if {[file exists [file join $gccpath libgloss $cpu]]} {
verbose "Libgloss path is $gccpath/libgloss/$cpu" 2
return "-B$gccpath/libgloss/$cpu/ -L$gccpath/libgloss/$cpu -L$gloss_srcdir"
} else {
verbose -log "No libgloss support for this target." 2
return ""
}
}
# There aren't any, but we'll be orthogonal here.
#
proc libgloss_include_flags { args } {
return ""
}
# Find the newlib libraries in the current source tree.
#
proc newlib_link_flags { args } {
global tool_root_dir
# libgloss doesn't work native
if {[isnative]} {
return ""
}
# if we're on a remote host, we can't search for the file, so we can only
# use an installed compiler, so we don't add any paths here.
if {[is_remote host]} {
return ""
}
set ld_script_path [lookfor_file ${tool_root_dir} "ld/ldscripts"]
if { $ld_script_path != "" } {
set result "-L[file dirname $ld_script_path]"
} else {
set result ""
}
set gccpath "[get_multilibs]"
verbose "Looking for $gccpath/newlib"
if {[file exists [file join $gccpath newlib]]} {
verbose "Newlib path is $gccpath/newlib"
return "$result -B$gccpath/newlib/ -L$gccpath/newlib"
} else {
verbose "No newlib support for this target"
return "$result"
}
}
proc newlib_include_flags { args } {
global srcdir
if {[isnative]} {
return ""
}
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
if {[file exists [file join $gccpath newlib]]} {
verbose "Newlib path is $gccpath/newlib"
set newlib_dir [lookfor_file ${srcdir} newlib/libc/include/assert.h]
if { ${newlib_dir} != "" } {
set newlib_dir [file dirname ${newlib_dir}]
}
# Note - we use -isystem rather than -I because newlib contains
# system header files. This is especially important for the
# limits.h header which makes use of the #include_next directive.
# #include_next will generate error messages from GCC if compiling
# in strict ANSI mode or if another limits.h header cannot be found.
# When it is included via -isystem these things do not happen.
return " -isystem $gccpath/newlib/targ-include -isystem ${newlib_dir}"
} else {
verbose "No newlib support for this target"
}
}
proc libio_include_flags { args } {
global srcdir
global tool_root_dir
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
if { $gccpath == "" } {
set gccpath "$tool_root_dir"
}
set libio_bin_dir [lookfor_file ${gccpath} libio/_G_config.h]
# linux doesn't build _G_config.h and the test above fails, so
# we search for iostream.list too.
if { $libio_bin_dir == "" } {
set libio_bin_dir [lookfor_file ${gccpath} libio/iostream.list]
}
set libio_src_dir [lookfor_file ${srcdir} libio/Makefile.in]
if { $libio_bin_dir != "" && $libio_src_dir != "" } {
set libio_src_dir [file dirname ${libio_src_dir}]
set libio_bin_dir [file dirname ${libio_bin_dir}]
# Note - unlike the newlib_include_flags proc above we use the -I
# switch to specify the include paths. This is because these headers
# are not system headers, and if -isystem were to be used GCC would
# generate an implicit extern "C" { ... } surrounding them. This
# will break targets which do not define NO_IMPLICIT_EXTERN_C.
return " -I${libio_src_dir} -I${libio_bin_dir}"
} else {
return ""
}
}
proc libio_link_flags { args } {
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
set libio_dir [lookfor_file ${gccpath} libio/libio.a]
if { $libio_dir != "" } {
return "-L[file dirname ${libio_dir}]"
} else {
return ""
}
}
proc g++_include_flags { args } {
global srcdir
global target_alias
if {[is_remote host]} {
return ""
}
set gccpath [get_multilibs]
set libio_dir ""
set flags ""
set dir [lookfor_file ${srcdir} libg++]
if { ${dir} != "" } {
# See comment in libio_include_flags about using -I.
append flags " -I${dir} -I${dir}/src"
}
set dir [lookfor_file ${srcdir} libstdc++-v3]
if { ${dir} != "" } {
append flags " -I${dir}/include -I${dir}/include/std -I${dir}/include/c_std -I${dir}/libsupc++"
}
set dir [lookfor_file ${gccpath} libstdc++-v3]
if { ${dir} != "" } {
append flags " -I${dir}/include -I${dir}/include/${target_alias}"
}
set dir [lookfor_file ${srcdir} libstdc++]
if { ${dir} != "" } {
append flags " -I${dir} -I${dir}/stl"
}
return "$flags"
}
proc g++_link_flags { args } {
global srcdir
global ld_library_path
set gccpath [get_multilibs]
set libio_dir ""
set flags ""
set ld_library_path "."
if { $gccpath != "" } {
if {[file exists [file join ${gccpath} lib libstdc++.a]]} {
append ld_library_path ":${gccpath}/lib"
}
if {[file exists [file join ${gccpath} libg++ libg++.a]]} {
append flags "-L${gccpath}/libg++ "
append ld_library_path ":${gccpath}/libg++"
}
if {[file exists [file join ${gccpath} libstdc++ libstdc++.a]]} {
append flags "-L${gccpath}/libstdc++ "
append ld_library_path ":${gccpath}/libstdc++"
}
if {[file exists [file join ${gccpath} libstdc++-v3 src .libs libstdc++.a]]} {
append flags "-L${gccpath}/libstdc++-v3/src/.libs "
append ld_library_path ":${gccpath}/libstdc++-v3/src/.libs"
}
if {[file exists [file join ${gccpath} libiberty libiberty.a]]} {
append flags "-L${gccpath}/libiberty "
}
if {[file exists [file join ${gccpath} librx librx.a]]} {
append flags "-L${gccpath}/librx "
}
} else {
global tool_root_dir
set libgpp [lookfor_file ${tool_root_dir} libg++]
if { $libgpp != "" } {
append flags "-L${libgpp} "
append ld_library_path ":${libgpp}"
}
set libstdcpp [lookfor_file ${tool_root_dir} libstdc++]
if { $libstdcpp != "" } {
append flags "-L${libstdcpp} "
append ld_library_path ":${libstdcpp}"
}
set libiberty [lookfor_file ${tool_root_dir} libiberty]
if { $libiberty != "" } {
append flags "-L${libiberty} "
}
set librx [lookfor_file ${tool_root_dir} librx]
if { $librx != "" } {
append flags "-L${librx} "
}
}
return "$flags"
}
proc libstdc++_include_flags { args } {
global srcdir
global target_alias
if {[is_remote host]} {
return ""
}
set gccpath [get_multilibs]
set libio_dir ""
set flags ""
set dir [lookfor_file ${srcdir} libstdc++-v3]
if { ${dir} != "" } {
# See comment in libio_include_flags about using -I.
append flags " -I${dir}/include -I${dir}/include/std -I${dir}/include/c_std -I${dir}/libsupc++"
}
set gccpath [get_multilibs]
set dir [lookfor_file ${gccpath} libstdc++-v3]
if { ${dir} != "" } {
append flags " -I${dir}/include -I${dir}/include/${target_alias}"
}
set dir [lookfor_file ${srcdir} libstdc++]
if { ${dir} != "" } {
append flags " -I${dir} -I${dir}/stl"
}
return "$flags"
}
proc libstdc++_link_flags { args } {
global srcdir
global ld_library_path
set gccpath [get_multilibs]
set libio_dir ""
set flags ""
if { $gccpath != "" } {
if {[file exists [file join ${gccpath} libstdc++ libstdc++.a]]} {
append flags "-L${gccpath}/libstdc++ "
append ld_library_path ":${gccpath}/libstdc++"
}
if {[file exists [file join ${gccpath} libiberty libiberty.a]]} {
append flags "-L${gccpath}/libiberty "
}
if {[file exists [file join ${gccpath} librx librx.a]]} {
append flags "-L${gccpath}/librx "
}
} else {
global tool_root_dir
set libstdcpp [lookfor_file ${tool_root_dir} libstdc++]
if { $libstdcpp != "" } {
append flags "-L${libstdcpp} "
append ld_library_path ":${libstdcpp}"
}
set libiberty [lookfor_file ${tool_root_dir} libiberty]
if { $libiberty != "" } {
append flags "-L${libiberty} "
}
set librx [lookfor_file ${tool_root_dir} librx]
if { $librx != "" } {
append flags "-L${librx} "
}
}
return "$flags"
}
# Get the list of directories and -m options for gcc. This is kinda bogus that
# generic testing software needs support for gcc hardwired in, but to make
# testing the GNU tools work right, there didn't seem to be any other way.
#
proc get_multilibs { args } {
global target_alias
global board
global board_info
# if we're on a remote host, we can't search for the file, so we can only
# use an installed compiler, so we don't add any paths here.
if {[is_remote host]} {
return ""
}
if {[info exists board]} {
set target_board $board
} else {
set target_board [target_info name]
}
if { [llength $args] == 0 } {
if {[board_info $target_board exists multitop]} {
return "[board_info $target_board multitop]"
}
set board_info($target_board,multitop) ""
}
if { [board_info $target_board exists compiler] } {
set compiler [board_info $target_board compiler]
} else {
set compiler [find_gcc]
}
if { $compiler == "" } {
return ""
}
foreach x "$compiler" {
if {[regexp "^-B" "$x"]} {
regsub "^-B" "$x" "" comp_base_dir
set comp_base_dir [file dirname $comp_base_dir]
break
}
}
regexp "/.* " $compiler compiler
set compiler [string trimright $compiler " "]
verbose "compiler is $compiler"
if { [which $compiler] == 0 } {
return ""
}
if { [llength $args] > 0 } {
set mopts [lindex $args 0]
} else {
if { [board_info $target_board exists multilib_flags] } {
set mopts [board_info $target_board multilib_flags]
} else {
set mopts ""
}
}
set default_multilib [exec $compiler --print-multi-lib]
set default_multilib [lindex $default_multilib 0]
set extra [string trimleft $default_multilib ".;@@"]
# extract the options and their directory names as know by gcc
foreach i "[exec $compiler --print-multi-lib]" {
if {$extra != ""} {
# string trimright would do the wrong thing if we included
# the leading @@ in $extra
set i [string trimright $i $extra]
set i [string trimright $i "@@"]
}
set opts ""
set dir ""
regexp -- "\[a-z0-9=/\.-\]*;" $i dir
set dir [string trimright $dir "\;@"]
regexp -- "\;@*\[\@a-zA-Z0-9=/\.-\]*" $i opts
set opts [split [string trimleft $opts "\;@@"] "@@"]
lappend multilibs "$dir {$opts }"
# If args contains arguments don't use the first one as
# multilib option unless it qualifies as a multilib option.
if { [llength $args] > 0 } {
set override_opt [lindex $args 0]
foreach j $opts {
if {$j == $override_opt} {
set mopts $override_opt
}
}
}
}
regsub "^-" $mopts "" moptions
regsub -all " -" $moptions " " dirty_moptions
set moptions ""
foreach x [split $dirty_moptions " "] {
if { $x != "" && [lsearch -exact $moptions $x] < 0 } {
lappend moptions $x
}
}
if {![info exists comp_base_dir]} {
set comp_base_dir [file dirname [file dirname [file dirname [file dirname [file dirname [exec $compiler --print-prog-name=cc1]]]]]]
}
# search for the top level multilib directory
set multitop [lookfor_file "${comp_base_dir}" "${target_alias}"]
if { $multitop == "" } {
set multitop [lookfor_file "${comp_base_dir}" "libraries"]
if { $multitop == "" } {
set multitop "[lookfor_file ${comp_base_dir} gcc/xgcc]"
if { $multitop != "" } {
set multitop [file dirname [file dirname $multitop]]
} else {
return ""
}
}
}
set gccpath [eval exec "$compiler" --print-multi-directory $mopts]
set gccpath [lindex $gccpath 0]
if { $gccpath != "" } {
verbose "GCC path is $gccpath"
if { [llength $args] == 0 } {
set board_info($target_board,multitop) "$multitop/$gccpath"
}
return "$multitop/$gccpath"
}
# extract the MULTILIB_MATCHES from dumpspecs
set multimatches ""
set lines [split [exec $compiler -dumpspecs] "\n"]
for {set i 0} {$i <= [llength $lines] - 1} {incr i 1} {
if {"*multilib_matches:" == "[lindex $lines $i]"} {
set multimatches [lindex $lines [expr {$i + 1}]]
break
}
}
# if we find some
if {$multimatches != ""} {
# Split it into a list of pairs. If an moptions are the first
# of a pair, then replace it with the second. If an moption
# is not in multimatches, we assume it's not a multilib option
set splitmatches [split $multimatches ";"]
set multimatches ""
foreach i $splitmatches {
lappend multimatches [split $i " "]
}
verbose "multimatches: $multimatches" 3
verbose "options before multimatches: $moptions" 3
set toptions $moptions
set moptions ""
foreach i $toptions {
foreach j $multimatches {
verbose "comparing [lindex $j 0] == $i" 3
if {[lindex $j 0] == $i} {
lappend moptions [lindex $j 1]
}
}
}
verbose "options after multimatches: $moptions" 3
}
# make a list of -m<foo> options from the various compiler config variables
set gccpath ""
# compare the lists of gcc options with the list of support multilibs
verbose "Supported multilibs are: $multilibs" 3
set best 0
foreach i "$multilibs" {
set hits 0
set opts [lindex $i 1]
if { [llength $opts] <= [llength $moptions] } {
foreach j "$moptions" {
# see if all the -m<foo> options match any of the multilibs
verbose "Looking in $i for $j" 3
if { [lsearch -exact $opts $j] >= 0 } {
incr hits
}
}
if { $hits > $best } {
verbose "[lindex $i 0] is better, using as gcc path" 2
set gccpath "[lindex $i 0]"
set best $hits
}
}
}
if {![info exists multitop]} {
return ""
}
verbose "gccpath is $gccpath" 3
if {[file exists [file join $multitop $gccpath]]} {
verbose "GCC path is $multitop/$gccpath" 3
if { [llength $args] == 0 } {
set board_info($target_board,multitop) "$multitop/$gccpath"
}
return "$multitop/$gccpath"
} else {
verbose "GCC path is $multitop" 3
if { [llength $args] == 0 } {
set board_info($target_board,multitop) "$multitop"
}
return "$multitop"
}
}
proc find_binutils_prog { name } {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir $name]
if { $file == "" } {
set file [lookfor_file $tool_root_dir ${name}-new]
}
if { $file == "" } {
set file [lookfor_file $tool_root_dir binutils/$name]
}
if { $file == "" } {
set file [lookfor_file $tool_root_dir binutils/${name}-new]
}
if { $file != "" } {
set NAME "$file"
} else {
set NAME [transform $name]
}
} else {
set NAME [transform $name]
}
return $NAME
}
proc find_gcc {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir xgcc]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/xgcc]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform gcc]
}
} else {
set CC [transform gcc]
}
return $CC
}
proc find_gcj {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir gcj]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/gcj]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform gcj]
}
} else {
set CC [transform gcj]
}
return $CC
}
proc find_g++ {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir xg++]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/xg++]
}
if { $file == "" } {
set file [lookfor_file $tool_root_dir g++]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform g++]
}
} else {
set CC [transform g++]
}
return $CC
}
proc find_gdc {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir gdc]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/gdc]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform gdc]
}
} else {
set CC [transform gdc]
}
return $CC
}
proc find_g77 {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir g77]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/g77]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform g77]
}
} else {
set CC [transform g77]
}
return $CC
}
proc find_gfortran {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir gfortran]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/gfortran]
}
if { $file != "" } {
set CC "$file -B[file dirname $file]/"
} else {
set CC [transform gfortran]
}
} else {
set CC [transform gfortran]
}
return $CC
}
proc find_gnatmake {} {
global tool_root_dir
if {![is_remote host]} {
set file [lookfor_file $tool_root_dir gnatmake]
if { $file == "" } {
set file [lookfor_file $tool_root_dir gcc/gnatmake]
}
if { $file != "" } {
set root [file dirname $file]
set CC "$file -I$root/ada/rts --GCC=$root/xgcc --GNATBIND=$root/gnatbind --GNATLINK=$root/gnatlink -cargs -B$root -largs --GCC=$root/xgcc -B$root -margs"
} else {
set CC [transform gnatmake]
}
} else {
set CC [transform gnatmake]
}
return $CC
}
proc find_nm {} {
global tool_root_dir
set NM ""
if {![is_remote host]} {
set NM [lookfor_file $tool_root_dir nm-new]
if {$NM == ""} {
set NM [lookfor_file $tool_root_dir binutils/nm-new]
}
}
if { $NM == ""} {
set NM [transform nm]
}
return $NM
}
proc process_multilib_options { args } {
global board
global board_variant_list
global is_gdb_remote
set is_gdb_remote 0
if {[board_info $board exists multilib_flags]} {
return
}
eval add_multilib_option $args
set multilib_flags ""
foreach x $board_variant_list {
regsub -all "^\[ \t\]*" "$x" "" x
regsub -all "\[ \t\]*$" "$x" "" x
if { $x == "" } {
continue
}
switch -glob -- $x {
"aout" {
set_board_info obj_format "a.out"
}
"elf" {
set_board_info obj_format "elf"
}
"pe" {
set_board_info obj_format "pe"
}
"ecoff" {
set_board_info obj_format "ecoff"
}
"stabs" {
set_board_info debug_flags "-gstabs"
}
"dwarf2" {
set_board_info debug_flags "-gdwarf2"
}
"gdb:*=*" {
regsub "^gdb:\[^=\]*=(.*)$" "$x" "\\1" value
regsub "^gdb:(\[^=\]*)=.*$" "$x" "\\1" variable
set_board_info $variable "$value"
}
"gdb*remote" {
set is_gdb_remote 1
}
"little*endian" -
"el" -
"EL" {
append multilib_flags " -EL"
}
"big*endian" -
"eb" -
"EB" {
append multilib_flags " -EB"
}
"soft*float" {
append multilib_flags " -msoft-float"
}
"-*" {
append multilib_flags " $x"
}
default {
append multilib_flags " -m$x"
}
}
}
set_board_info multilib_flags $multilib_flags
}
proc add_multilib_option { args } {
global board_variant_list
if {![info exists board_variant_list]} {
set board_variant_list ""
}
set board_variant_list [concat $args $board_variant_list]
}
proc find_gas { } {
global tool_root_dir
set AS ""
if {![is_remote host]} {
set AS [lookfor_file $tool_root_dir as-new]
if { $AS == "" } {
set AS [lookfor_file $tool_root_dir gas/as-new]
}
}
if { $AS == "" } {
set AS [transform as]
}
return $AS
}
proc find_ld { } {
global tool_root_dir
set LD ""
if {![is_remote host]} {
set LD [lookfor_file $tool_root_dir ld-new]
if { $LD == "" } {
set LD [lookfor_file $tool_root_dir ld/ld-new]
}
}
if { $LD == "" } {
set LD [transform ld]
}
return $LD
}
proc build_wrapper { gluefile } {
global libdir
global tool
if {[target_info exists wrap_m68k_aout]} {
set flags "additional_flags=-DWRAP_M68K_AOUT"
set result ""
} elseif {[target_info exists uses_underscores]} {
set flags "additional_flags=-DUNDERSCORES"
set result "-Wl,-wrap,_exit -Wl,-wrap,__exit -Wl,-wrap,_main -Wl,-wrap,_abort"
} else {
set flags ""
if {[target_info exists is_vxworks]} {
set flags "additional_flags=-DVXWORKS"
set result "-Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort"
} else {
set result "-Wl,-wrap,exit -Wl,-wrap,_exit -Wl,-wrap,main -Wl,-wrap,abort"
}
}
if {[target_info exists wrap_compile_flags]} {
lappend flags "additional_flags=[target_info wrap_compile_flags]"
}
if { [target_compile ${libdir}/testglue.c ${gluefile} object $flags] == "" } {
set gluefile [remote_download host ${gluefile} ${tool}_tg.o]
return [list $gluefile $result]
} else {
return ""
}
}
proc winsup_include_flags { args } {
global srcdir
if {[isnative]} {
return ""
}
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
if {[file exists [file join $gccpath winsup]]} {
verbose "Winsup path is $gccpath/winsup"
set winsup_dir [lookfor_file ${srcdir} winsup/include/windows.h]
if { ${winsup_dir} != "" } {
set winsup_dir [file dirname ${winsup_dir}]
# See comment in libio_include_flags about using -I.
return " -I${winsup_dir}"
}
}
verbose "No winsup support for this target"
}
# Find the winsup libraries in the current source tree.
#
proc winsup_link_flags { args } {
# libgloss doesn't work native
if {[isnative]} {
return ""
}
# if we're on a remote host, we can't search for the file, so we can only
# use an installed compiler, so we don't add any paths here.
if {[is_remote host]} {
return ""
}
set gccpath "[get_multilibs]"
verbose "Looking for $gccpath/winsup"
if {[file exists [file join $gccpath winsup]]} {
verbose "Winsup path is $gccpath/newlib"
return "-B$gccpath/winsup/ -L$gccpath/winsup"
} else {
verbose "No winsup support for this target"
return ""
}
}