path: root/ld/testsuite/lib/ld-lib.exp

# Support routines for LD testsuite.
#   Copyright (C) 1994-2023 Free Software Foundation, Inc.
#
# This file is part of the GNU Binutils.
#
# This file 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; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
# MA 02110-1301, USA.

load_file $srcdir/../../binutils/testsuite/lib/binutils-common.exp

# Returns 1 if the gcc for the target is at least version MAJOR.MINOR
# Returns 0 otherwise.
#
proc at_least_gcc_version { major minor } {
    global CC_FOR_TARGET

    if {![info exists CC_FOR_TARGET]} {
	set CC_FOR_TARGET [find_gcc]
    }
    if { $CC_FOR_TARGET == "" } {
	return 0
    }
    # Filter out -Wl, options.
    regsub -all -- "-Wl,\[^ ^\t\]+" $CC_FOR_TARGET "" cc_cmd
    set state [remote_exec host $cc_cmd --version]
    if { [lindex $state 0] != 0 } {
	return 0;
    }
    set tmp "[lindex $state 1]\n"
    # Look for (eg) 4.6.1 in the version output.
    set ver_re "\[^\\.0-9\]+(\[1-9\]\[0-9\]*)\\.(\[0-9\]+)(?:\\.\[0-9\]+)?"
    regexp $ver_re $tmp fred maj min
    verbose "gcc version: $tmp"
    if { ![info exists maj] || ![info exists min] } then {
	perror "can't decipher gcc version number, fix the framework!"
	return 0
    }
    verbose "major gcc version is $maj, want at least $major"
    if { $maj == $major } then {
	verbose "minor gcc version is $min, want at least $minor"
	return [expr $min >= $minor]
    } else {
	return [expr $maj > $major]
    }
}

# Extract and print the version number of ld.
#
proc default_ld_version { ld } {
    global host_triplet

    if { ![is_remote host] && [which $ld] == 0 } then {
	perror "$ld does not exist"
	exit 1
    }

    remote_exec host "$ld --version" "" "/dev/null" "ld.version"
    remote_upload host "ld.version"
    set tmp [prune_warnings [file_contents "ld.version"]]
    remote_file build delete "ld.version"
    remote_file host delete "ld.version"

    regexp "\[^\n\]* (cygnus-|)(\[-0-9.a-zA-Z-\]+)\[\r\n\].*" $tmp version cyg number
    if [info exists number] then {
	clone_output "$ld $number\n"
    }
}

proc run_host_cmd { prog command } {
    global link_output
    global gcc_B_opt
    global ld_L_opt
    global gcc_ld_B_opt_tested
    global ld

    if { ![is_remote host] && [which "$prog"] == 0 } then {
	perror "$prog does not exist"
	return 0
    }

    # If we are compiling with gcc, we want to add gcc_B_opt and
    # ld_L_opt to flags.  However, if $prog already has -B options,
    # which might be the case when running gcc out of a build
    # directory, we want our -B options to come first.
    set gccexe $prog
    set gccparm [string first " " $gccexe]
    set gccflags ""
    if { $gccparm > 0 } then {
	set gccflags [string range $gccexe $gccparm end]
	set gccexe [string range $gccexe 0 $gccparm]
	set prog $gccexe
    }
    set gccexe [string replace $gccexe 0 [string last "/" $gccexe] ""]
    if {[string match "*cc*" $gccexe] ||
	[string match "*++*" $gccexe] ||
	[string match "clang*" $gccexe]} then {
	set gccflags "$gcc_B_opt $gccflags $ld_L_opt"
	if {![info exists gcc_ld_B_opt_tested]} {
	    set gcc_ld_B_opt_tested 1
	    set ld_version_message [run_host_cmd "$ld" "--version"]
	    set ver "-Wl,--version"
	    if [check_lto_available] {
		set ver "-fno-lto $ver"
	    }
	    set gcc_ld_version_message [run_host_cmd "$prog" "$gccflags $ver"]
	    if {[string first $ld_version_message $gcc_ld_version_message] < 0} {
		perror "************************************************************************"
		perror "Your compiler apparently ignores -B when choosing ld."
		set gcc_v [run_host_cmd "$prog" "$gccflags -v"]
		if { [string first "--with-ld=" $gcc_v] >= 0 } {
		    perror "Hint: don't configure gcc using --with-ld (or --with-as)"
		}
		perror "You will not be testing the new ld in many of the following tests."
		set gcc_ld_version [run_host_cmd "$prog" "$gccflags --print-prog-name=ld"]
		if {![string match "" $gcc_ld_version] && ![string match "ld" $gcc_ld_version]} {
		    perror "It seems you will be testing $gcc_ld_version instead."
		}
		perror "************************************************************************"
	    }
	}
    }

    verbose -log "$prog $gccflags $command"
    set status [remote_exec host [concat sh -c [list "$prog $gccflags $command 2>&1"]] "" "/dev/null" "ld.tmp"]
    remote_upload host "ld.tmp"
    set link_output [file_contents "ld.tmp"]
    regsub "\n$" $link_output "" link_output
    if { [lindex $status 0] != 0 && [string match "" $link_output] } then {
	append link_output "child process exited abnormally"
    }
    remote_file build delete ld.tmp
    remote_file host delete ld.tmp

    if [string match "" $link_output] then {
	return ""
    }

    verbose -log "$link_output"
    return "$link_output"
}

proc run_host_cmd_yesno { prog command } {
    global exec_output
    global errcnt warncnt

    set exec_output [prune_warnings [run_host_cmd "$prog" "$command"]]
    # Ignore error and warning.
    set errcnt 0
    set warncnt 0
    if [string match "" $exec_output] then {
	return 1;
    }
    return 0;
}

# Link an object using relocation.
#
proc default_ld_relocate { ld target objects } {
    global HOSTING_EMU

    remote_file host delete $target
    return [run_host_cmd_yesno "$ld" "$HOSTING_EMU -o $target -r $objects"]
}

# Check to see if ld is being invoked with a non-endian output format
#
proc is_endian_output_format { object_flags } {

    if {[string match "*-oformat binary*" $object_flags] ||      \
	[string match "*-oformat ieee*" $object_flags] ||	 \
	[string match "*-oformat ihex*" $object_flags] ||	 \
	[string match "*-oformat netbsd-core*" $object_flags] || \
	[string match "*-oformat srec*" $object_flags] ||	 \
	[string match "*-oformat tekhex*" $object_flags] ||      \
	[string match "*-oformat trad-core*" $object_flags] } then {
	return 0
    } else {
	return 1
    }
}

# Link a program using ld
#
proc default_ld_link { ld target objects } {
    global host_triplet
    global exec_output

    set flags ""
    if [is_endian_output_format $objects] then {
	set flags [big_or_little_endian]
    }

    remote_file host delete $target
    set exec_output [run_host_cmd "$ld" "$flags -o $target $objects"]
    set exec_output [prune_warnings $exec_output]

    # We don't care if we get a warning about a non-existent start
    # symbol, since the default linker script might use ENTRY.
    regsub -all "(^|\n)(\[^\n\]*: warning: cannot find entry symbol\[^\n\]*\n?)" $exec_output "\\1" exec_output

    return [string match "" $exec_output]
}

# Compile an object using cc.
#
proc default_ld_compile { cc source object } {
    global CFLAGS_FOR_TARGET
    global CXXFLAGS_FOR_TARGET
    global srcdir
    global subdir
    global host_triplet
    global gcc_B_opt

    set cc_prog $cc
    if {[llength $cc_prog] > 1} then {
	set cc_prog [lindex $cc_prog 0]
    }
    if {![is_remote host] && [which $cc_prog] == 0} then {
	perror "$cc_prog does not exist"
	return 0
    }

    remote_file build delete "$object"
    remote_file host delete "$object"

    set flags "$gcc_B_opt -I$srcdir/$subdir"

    # If we are compiling with gcc, we want to add gcc_B_opt to flags.
    # However, if $prog already has -B options, which might be the
    # case when running gcc out of a build directory, we want our -B
    # options to come first.
    set ccexe $cc
    set ccparm [string first " " $cc]
    set ccflags ""
    if { $ccparm > 0 } then {
	set ccflags [string range $cc $ccparm end]
	set ccexe [string range $cc 0 $ccparm]
	set cc $ccexe
    }

    set ccexe [string replace $ccexe 0 [string last "/" $ccexe] ""]
    if {[string match "*++*" $ccexe]} {
	append flags " $CXXFLAGS_FOR_TARGET"
    } else {
	append flags " $CFLAGS_FOR_TARGET"
    }

    if [board_info [target_info name] exists cflags] {
	append flags " [board_info [target_info name] cflags]"
    }

    if [board_info [target_info name] exists multilib_flags] {
	append flags " [board_info [target_info name] multilib_flags]"
    }

    set cmd "$cc $flags $ccflags -c $source -o $object"
    verbose -log "$cmd"

    set status [remote_exec host [concat sh -c [list "$cmd 2>&1"]] "" "/dev/null" "ld.tmp"]
    remote_upload host "ld.tmp"
    set exec_output [file_contents "ld.tmp"]
    remote_file build delete "ld.tmp"
    remote_file host delete "ld.tmp"
    set exec_output [prune_warnings $exec_output]
    # Versions of gcc up to and including pre-release gcc-7, at least on
    # some targets, generate .section directives with incorrect type.
    # Ignore warnings from the assembler about this.
    regsub -all "(^|\n)\[^\n\]*: ignoring incorrect section type \[^\n\]*" $exec_output "" exec_output
    regsub -all "^\[^\n\]*: Assembler messages:\n" $exec_output "" exec_output
    if [string match "" $exec_output] then {
	if {![file exists $object]} then {
	    regexp ".*/(\[^/\]*)$" $source all dobj
	    regsub "\\.c" $dobj ".o" realobj
	    verbose "looking for $realobj"
	    if {[remote_file host exists $realobj]} then {
		verbose -log "mv $realobj $object"
		remote_upload "$realobj" "$object"
	    } else {
		perror "$object not found after compilation"
		return 0
	    }
	}
	return 1
    } else {
	verbose -log "$exec_output"
	return 0
    }
}

# Assemble a file.
#
proc default_ld_assemble { as in_flags source object } {
    global ASFLAGS
    global host_triplet
    global srcdir
    global subdir

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

    set flags [big_or_little_endian]
    if [info exists subdir] {
	append flags " -I$srcdir/$subdir"
    }
    set exec_output [run_host_cmd "$as" "$flags $in_flags $ASFLAGS -o $object $source"]
    set exec_output [prune_warnings $exec_output]
    if [string match "" $exec_output] then {
	return 1
    } else {
	return 0
    }
}

# Run nm on a file, putting the result in the array nm_output.
#
proc default_ld_nm { nm nmflags object } {
    global NMFLAGS
    global nm_output
    global host_triplet

    if {[info exists nm_output]} {
      unset nm_output
    }

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

    # Ensure consistent sorting of symbols
    if {[info exists env(LC_ALL)]} {
	set old_lc_all $env(LC_ALL)
    }
    set env(LC_ALL) "C"

    verbose -log "$nm $NMFLAGS $nmflags $object >tmpdir/nm.out"

    set status [remote_exec host [concat sh -c [list "$nm $NMFLAGS $nmflags $object 2>ld.stderr"]] "" "/dev/null" "tmpdir/nm.out"]
    if {[info exists old_lc_all]} {
	set env(LC_ALL) $old_lc_all
    } else {
	unset env(LC_ALL)
    }
    remote_upload host "ld.stderr"
    remote_upload host "tmpdir/nm.out" "tmpdir/nm.out"
    set exec_output [prune_warnings [file_contents "ld.stderr"]]
    remote_file host delete "ld.stderr"
    remote_file build delete "ld.stderr"
    if [string match "" $exec_output] then {
	set file [open tmpdir/nm.out r]
	while { [gets $file line] != -1 } {
	    verbose "$line" 2
	    if [regexp "^(\[0-9a-fA-F\]+) \[a-zA-Z0-9\] \\.*(.+)$" $line whole value name] {
		set name [string trimleft $name "_"]
		verbose "Setting nm_output($name) to 0x$value" 2
		set nm_output($name) 0x$value
	    }
	}
	close $file
	return 1
    } else {
	verbose -log "$exec_output"
	return 0
    }
}

# Define various symbols needed when not linking against all
# target libs.
proc ld_link_defsyms {} {

    set flags "--defsym __stack_chk_fail=0"

    # ARM targets call __gccmain
    if {[istarget arm*-*-*]} {
	append flags " --defsym __gccmain=0"
    }

    # Windows targets need __main, some prefixed with underscore.
    if [is_pecoff_format] {
	append flags " --defsym __main=main --defsym ___main=main"
    }

    # PowerPC EABI code calls __eabi.
    if {[istarget powerpc*-*-eabi*] || [istarget powerpc*-*-rtems*]} {
	append flags " --defsym __eabi=0"
    }

    # mn10200 code calls __truncsipsi2_d0_d2.
    if {[istarget mn10200*-*-*]} then {
	append flags " --defsym __truncsipsi2_d0_d2=0"
    }

    # m6811/m6812 code has references to soft registers.
    if {[istarget m6811-*-*] || [istarget m6812-*-*] || [istarget m68hc1*-*-*]} {
	append flags " --defsym _.frame=0 --defsym _.d1=0 --defsym _.d2=0"
	append flags " --defsym _.d3=0 --defsym _.d4=0"
	append flags " --defsym _.tmp=0 --defsym _.xy=0 --defsym _.z=0"
    }

    # Some OpenBSD targets have ProPolice and reference __guard and
    # __stack_smash_handler.
    if [istarget *-*-openbsd*] {
	append flags " --defsym __guard=0"
	append flags " --defsym __stack_smash_handler=0"
    }

    return $flags
}

# Create an archive using ar
#
proc ar_simple_create { ar aropts target objects } {
    remote_file host delete $target

    set exec_output [run_host_cmd "$ar" "$aropts rc $target $objects"]
    set exec_output [prune_warnings $exec_output]

    if [string match "" $exec_output] then {
	send_log "$exec_output\n"
	return 1
    } else {
	return 0
    }
}

# List contains test-items with 3 items followed by 2 lists, one item and
# one optional item:
#  0:name
#  1:ld/ar leading options, placed before object files
#  2:ld/ar trailing options, placed after object files
#  3:assembler options
#  4:filenames of assembler files
#  5:list of actions, options and expected outputs.
#  6:name of output file
#  7:compiler flags (optional)
#
# Actions: { command command-line-options file-containg-expected-output-regexps }
# Commands:
#   objdump: Apply objdump options on result.
#   nm: Apply nm options on result.
#   readelf: Apply readelf options on result.
#   ld: Don't apply anything on result.  Compare output during linking with
#     the file containing regexps (which is the second arg, not the third).
#     Note that this *must* be the first action if it is to be used at all;
#     in all other cases, any output from the linker during linking is
#     treated as a sign of an error and FAILs the test.
#
# args is an optional list of target triplets to be xfailed.
#
proc run_ld_link_tests { ldtests args } {
    global ld
    global LDFLAGS
    global as
    global nm
    global ar
    global objdump
    global READELF
    global srcdir
    global subdir
    global env
    global CC_FOR_TARGET
    global runtests
    global exec_output

    set ld_extra_opt $LDFLAGS
    if [check_relro_support] {
	append ld_extra_opt " -z norelro"
    }

    foreach testitem $ldtests {
	set testname [lindex $testitem 0]

	if ![runtest_file_p $runtests $testname] then {
	    continue
	}

	foreach target $args {
	    if [match_target $target] {
		setup_xfail "*-*-*"
		break
	    }
	}

	set ld_options [lindex $testitem 1]
	set ld_after [lindex $testitem 2]
	set as_options [lindex $testitem 3]
	set src_files  [lindex $testitem 4]
	set actions [lindex $testitem 5]
	set binfile tmpdir/[lindex $testitem 6]
	set cflags [lindex $testitem 7]
	set objfiles {}
	set is_unsupported 0
	set failed 0
	set maybe_failed 0
	set ld_output ""

	# Add -fno-lto.  LTO should be tested explicitly by $cflags.
	if {[check_lto_available]} {
	    set cflags "-fno-lto $cflags"
	}

#	verbose -log "Testname is $testname"
#	verbose -log "ld_options is $ld_options"
#	verbose -log "ld_after is $ld_after"
#	verbose -log "as_options is $as_options"
#	verbose -log "src_files is $src_files"
#	verbose -log "actions is $actions"
#	verbose -log "binfile is $binfile"

	# Assemble each file in the test.
	foreach src_file $src_files {
	    set fileroot "[file rootname [file tail $src_file]]"

	    if { [file extension $src_file] == ".bz2" } {
		set objfile tmpdir/[file rootname $src_file]
		set unbzip2 "system \"bzip2 -dc $srcdir/$subdir/$src_file > $objfile\""
		send_log "$unbzip2\n"
		catch "$unbzip2" exec_output
		if ![string match "" $exec_output] then {
		    send_log "$exec_output\n"
		    set is_unsupported 1
		    break
		}
	    } else {
		set objfile "tmpdir/$fileroot.o"
		if { [file extension $src_file] == ".c" } {
		    set as_file "tmpdir/$fileroot.s"
		    if ![ld_compile "$CC_FOR_TARGET -S $cflags" $srcdir/$subdir/$src_file $as_file] {
			set is_unsupported 1
			break
		    }
		} else {
		    set as_file "$srcdir/$subdir/$src_file"
		}
		if ![ld_assemble $as "$as_options $as_file" $objfile] {
		    set failed 1
		    break
		}
	    }
	    lappend objfiles $objfile
	}

	# Catch assembler errors.
	if { $failed } {
	    fail $testname
	    continue
	}
	# Catch compiler errors.
	if { $is_unsupported } {
	    unsupported $testname
	    continue
	}

	if { $binfile eq "tmpdir/" } {
	    # compile only
	} elseif { [regexp ".*\\.a$" $binfile] } {
	    if { ![ar_simple_create $ar $ld_options $binfile "$objfiles $ld_after"] } {
		set failed 1
	    }
	} elseif { ![ld_link $ld $binfile "$ld_extra_opt -L$srcdir/$subdir $ld_options $objfiles $ld_after"] } {
	    set maybe_failed 1
	    set ld_output "$exec_output"
	}

	set is_unresolved 0
	if { !$failed } {
	    foreach actionlist $actions {
		set action [lindex $actionlist 0]
		set progopts [lindex $actionlist 1]

		# There are actions where we run regexp_diff on the
		# output, and there are other actions (presumably).
		# Handling of the former look the same.
		set dump_prog ""
		switch -- $action {
		    objdump
			{ set dump_prog $objdump }
		    nm
			{ set dump_prog $nm }
		    readelf
			{ set dump_prog $READELF }
		    ld
			{ set dump_prog "ld" }
		    default
			{
			    perror "Unrecognized action $action"
			    set is_unresolved 1
			    break
			}
		    }

		if { $action == "ld" } {
		    set regexpfile $progopts
		    verbose "regexpfile is $srcdir/$subdir/$regexpfile"
		    set_file_contents "tmpdir/ld.messages" "$ld_output"
		    verbose "ld.messages has '[file_contents tmpdir/ld.messages]'"
		    if { [regexp_diff "tmpdir/ld.messages" "$srcdir/$subdir/$regexpfile"] } then {
			verbose "output is $ld_output" 2
			set failed 1
			break
		    }
		    set maybe_failed 0
		} elseif { !$maybe_failed && $dump_prog != "" } {
		    set dumpfile [lindex $actionlist 2]
		    set binary $dump_prog

		    # Ensure consistent sorting of symbols
		    if {[info exists env(LC_ALL)]} {
			set old_lc_all $env(LC_ALL)
		    }
		    set env(LC_ALL) "C"
		    set cmd "$binary $progopts $binfile"
		    set status [remote_exec host [concat sh -c [list "$cmd >dump.out 2>ld.stderr"]] "" "/dev/null"]
		    send_log "$cmd\n"
		    remote_upload host "ld.stderr"
		    set comp_output [prune_warnings [file_contents "ld.stderr"]]
		    remote_file host delete "ld.stderr"
		    remote_file build delete "ld.stderr"

		    if {[info exists old_lc_all]} {
			set env(LC_ALL) $old_lc_all
		    } else {
			unset env(LC_ALL)
		    }

		    if ![string match "" $comp_output] then {
			send_log "$comp_output\n"
			set failed 1
			break
		    }

		    remote_upload host "dump.out"

		    if { [regexp_diff "dump.out" "$srcdir/$subdir/$dumpfile"] } then {
			verbose "output is [file_contents "dump.out"]" 2
			set failed 1
			remote_file build delete "dump.out"
			remote_file host delete "dump.out"
			break
		    }
		    remote_file build delete "dump.out"
		    remote_file host delete "dump.out"
		}
	    }
	}

	if { $is_unresolved } {
	    unresolved $testname
	} elseif { $maybe_failed || $failed } {
	    fail $testname
	} else {
	    pass $testname
	}
    }
}

# ldtests contains test-items with 3 items followed by 1 lists, 2 items
# and 3 optional items:
#   0:name
#   1:ld leading options, placed before object files
#   2:assembler options
#   3:filenames of source files
#   4:name of output file
#   5:expected output
#   6:compiler flags (optional)
#   7:language (optional)
#   8:linker warning (optional)
#   9:ld trailing options, placed after object files (optional)
# args is an optional list of target triplets to be xfailed.

proc run_ld_link_exec_tests { ldtests args } {
    global ld
    global as
    global srcdir
    global subdir
    global env
    global CC_FOR_TARGET
    global CXX_FOR_TARGET
    global errcnt
    global exec_output
    global board_cflags
    global board_ldflags
    global STATIC_LDFLAGS

    # When using GCC as the linker driver, we need to specify board cflags when
    # linking because cflags may contain linker options.  For example when
    # linker options are included in GCC spec files then we need the -specs
    # option.
    if [board_info [target_info name] exists cflags] {
	set board_cflags " [board_info [target_info name] cflags]"
    } else {
	set board_cflags ""
    }

    if [board_info [target_info name] exists ldflags] {
	set board_ldflags " [board_info [target_info name] ldflags]"
    } else {
	set board_ldflags ""
    }

    foreach testitem $ldtests {
	set testname [lindex $testitem 0]
	set ld_options [lindex $testitem 1]
	set as_options [lindex $testitem 2]
	set src_files  [lindex $testitem 3]
	set binfile tmpdir/[lindex $testitem 4]
	set expfile [lindex $testitem 5]
	set cflags [lindex $testitem 6]
	set lang [lindex $testitem 7]
	set warning [lindex $testitem 8]
	set ld_after [lindex $testitem 9]
	set objfiles {}
	set failed 0

	if { ![check_compiler_available] } {
	    unsupported $testname
	    continue
	}

	# Add -fno-lto.  LTO should be tested explicitly by $cflags.
	if {[check_lto_available]} {
	    set cflags "-fno-lto $cflags"
	}

	foreach target $args {
	    if [match_target $target] {
		setup_xfail "*-*-*"
		break
	    }
	}

#	verbose -log "Testname is $testname"
#	verbose -log "ld_options is $ld_options"
#	verbose -log "as_options is $as_options"
#	verbose -log "src_files is $src_files"
#	verbose -log "binfile is $binfile"

	# Assemble each file in the test.
	foreach src_file $src_files {
	    set fileroot "[file rootname [file tail $src_file]]"
	    set objfile "tmpdir/$fileroot.o"
	    lappend objfiles $objfile

	    if { [ string match "c++" $lang ] } {
		set cmd "$CXX_FOR_TARGET -c $cflags"
	    } else {
		set cmd "$CC_FOR_TARGET -c $cflags"
	    }
	    if ![ld_compile $cmd $srcdir/$subdir/$src_file $objfile] {
		set failed 1
		break
	    }
	}
	if { $failed != 0 } {
	    unsupported $testname
	    continue
	}

	if { [ string match "asm" $lang ] } {
	    set link_proc ld_link
	    set link_cmd $ld
	} elseif { [ string match "c++" $lang ] } {
	    set link_proc ld_link
	    set link_cmd $CXX_FOR_TARGET
	} else {
	    set link_proc ld_link
	    set link_cmd $CC_FOR_TARGET
	}

	if { $binfile eq "tmpdir/" } {
	    # compile only
	    pass $testname
	    continue;
	} else {
	    if { [string match "" $STATIC_LDFLAGS] \
		 && [regexp -- ".* \[-\]+static .*" " $board_cflags $board_ldflags $ld_options $objfiles $ld_after "] } {
		untested $testname
		continue
	    }
	    if ![$link_proc $link_cmd $binfile "$board_cflags $board_ldflags -L$srcdir/$subdir $ld_options $objfiles $ld_after"] {
		set failed 1
	    }
	}

	# Check if exec_output is expected.
	if { $warning != "" } then {
	    verbose -log "returned with: <$exec_output>, expected: <$warning>"
	    if { [regexp $warning $exec_output] } then {
		set failed 0
	    } else {
		set failed 1
	    }
	}

	if { $failed == 0 && [isnative] } {
	    send_log "Running: $binfile > $binfile.out\n"
	    verbose "Running: $binfile > $binfile.out"
	    catch "exec $binfile > $binfile.out" exec_output

	    if ![string match "" $exec_output] then {
		send_log "$exec_output\n"
		verbose "$exec_output" 1
		set failed 1
	    } else {
		send_log [file_contents $binfile.out]
		verbose [file_contents $binfile.out] 2
		if [regexp_diff "$binfile.out" "$srcdir/$subdir/$expfile"] {
		    set failed 1
		}
	    }
	}

	if { $failed != 0 } {
	    fail $testname
	} elseif ![isnative] {
	    unsupported $testname
	} else {
	    set errcnt 0
	    pass $testname
	}
    }
}

# List contains test-items with 3 items followed by 2 lists, one item and
# one optional item:
#  0:name
#  1:ld or ar options
#  2:compile options
#  3:filenames of source files
#  4:action and options.
#  5:name of output file
#  6:language (optional)
#
# Actions:
# objdump: Apply objdump options on result.  Compare with regex (last arg).
# nm: Apply nm options on result.  Compare with regex (last arg).
# readelf: Apply readelf options on result.  Compare with regex (last arg).
# warning: Check linker output against regex (last arg).
# error: Like 'warning' but checking output in error case.
# warning_output: Check linker output against regex in a file (last arg).
# error_output: Like 'warning_output' but checking output in error case.
#
proc run_cc_link_tests { ldtests } {
    global nm
    global objdump
    global READELF
    global srcdir
    global subdir
    global env
    global CC_FOR_TARGET
    global CXX_FOR_TARGET
    global ar
    global exec_output
    global board_cflags
    global board_ldflags
    global STATIC_LDFLAGS

    if [board_info [target_info name] exists cflags] {
	set board_cflags " [board_info [target_info name] cflags]"
    } else {
	set board_cflags ""
    }

    if [board_info [target_info name] exists ldflags] {
	set board_ldflags " [board_info [target_info name] ldflags]"
    } else {
	set board_ldflags ""
    }

    foreach testitem $ldtests {
	set testname [lindex $testitem 0]
	set ldflags [lindex $testitem 1]
	set cflags [lindex $testitem 2]
	set src_files  [lindex $testitem 3]
	set actions [lindex $testitem 4]
	set binfile tmpdir/[lindex $testitem 5]
	set lang [lindex $testitem 6]
	set objfiles {}
	set is_unresolved 0
	set failed 0
	set check_ld(terminal) 0
	set check_ld(source) ""

	if { ![check_compiler_available] } {
	    unsupported $testname
	    continue
	}

	# Add -fno-lto.  LTO should be tested explicitly by $cflags.
	if {[check_lto_available]} {
	    set cflags "-fno-lto $cflags"
	}

	#verbose -log "testname  is $testname"
	#verbose -log "ldflags   is $ldflags"
	#verbose -log "cflags    is $cflags"
	#verbose -log "src_files is $src_files"
	#verbose -log "actions   is $actions"
	#verbose -log "binfile   is $binfile"
	#verbose -log "lang      is $lang"

	foreach actionlist $actions {
	    set action [lindex $actionlist 0]
	    set progopts [lindex $actionlist 1]

	    # Find actions related to error/warning processing.
	    switch -- $action {
		error
		{
		    set check_ld(source) "regexp"
		    set check_ld(regexp) $progopts
		    set check_ld(terminal) 1
		}
		warning
		{
		    set check_ld(source) "regexp"
		    set check_ld(regexp) $progopts
		}
		error_output
		{
		    set check_ld(source) "file"
		    set check_ld(file) $progopts
		    set check_ld(terminal) 1
		}
		warning_output
		{
		    set check_ld(source) "file"
		    set check_ld(file) $progopts
		}
	    }
	}

	# Compile each file in the test.
	foreach src_file $src_files {
	    set fileroot "[file rootname [file tail $src_file]]"
	    set objfile "tmpdir/$fileroot.o"
	    lappend objfiles $objfile

	    if { [ string match "c++" $lang ] } {
		set cmd "$CXX_FOR_TARGET -c $cflags"
	    } else {
		set cmd "$CC_FOR_TARGET -c $cflags"
	    }
	    if ![ld_compile $cmd $srcdir/$subdir/$src_file $objfile] {
		set failed 1
		break
	    }
	}
	if { $failed != 0 } {
	    unsupported $testname
	    continue
	}

	# Clear error and warning counts.
	reset_vars

	if { [ string match "c++" $lang ] } {
	    set cc_cmd $CXX_FOR_TARGET
	} else {
	    set cc_cmd $CC_FOR_TARGET
	}

	if { $binfile eq "tmpdir/" } {
	    # compile only
	    set binfile $objfile
	} elseif { [regexp ".*\\.a$" $binfile] } {
	    if { ![ar_simple_create $ar $ldflags $binfile "$objfiles"] } {
		set failed 1
	    }
	} else {
	    if { [string match "" $STATIC_LDFLAGS] \
		 && [regexp -- ".* \[-\]+static .*" " $board_cflags $board_ldflags $ldflags $objfiles "] } {
		untested $testname
		continue
	    }
	    ld_link $cc_cmd $binfile "$board_cflags $board_ldflags -L$srcdir/$subdir $ldflags $objfiles"
	    set ld_output "$exec_output"

	    if { $check_ld(source) == "regexp" } then {
		# Match output against regexp argument.
		verbose -log "returned with: <$ld_output>, expected: <$check_ld(regexp)>"
		if { ![regexp $check_ld(regexp) $ld_output] } then {
		    set failed 1
		}
	    } elseif { $check_ld(source) == "file" } then {
		# Match output against patterns in a file.
		set_file_contents "tmpdir/ld.messages" "$ld_output"
		verbose "ld.messages has '[file_contents tmpdir/ld.messages]'"
		if { [regexp_diff "tmpdir/ld.messages" "$srcdir/$subdir/$check_ld(file)"] } then {
		    verbose "output is $ld_output" 2
		    set failed 1
		}
	    }

	    if { $check_ld(source) != "" } then {
		if { $ld_output == "" } then {
		    verbose -log "Linker was expected to give error or warning"
		    set failed 1
		}
	    } else {
		if { $ld_output != "" } then {
		    verbose -log "Unexpected linker warning or error"
		    set failed 1
		}
	    }
	}

	if { $failed == 0 } {
	    foreach actionlist $actions {
		set action [lindex $actionlist 0]
		set progopts [lindex $actionlist 1]

		# There are actions where we run regexp_diff on the
		# output, and there are other actions (presumably).
		# Handling of the former look the same.
		set dump_prog ""
		switch -- $action {
		    objdump
			{ set dump_prog $objdump }
		    nm
			{ set dump_prog $nm }
		    readelf
			{ set dump_prog $READELF }
		    error {}
		    warning {}
		    error_output {}
		    warning_output {}
		    default
			{
			    perror "Unrecognized action $action"
			    set is_unresolved 1
			    break
			}
		    }

		if { $dump_prog != "" } {
		    set dumpfile [lindex $actionlist 2]
		    set binary $dump_prog

		    # Ensure consistent sorting of symbols
		    if {[info exists env(LC_ALL)]} {
			set old_lc_all $env(LC_ALL)
		    }
		    set env(LC_ALL) "C"
		    set cmd "$binary $progopts $binfile > dump.out"
		    send_log "$cmd\n"
		    catch "exec $cmd" comp_output
		    if {[info exists old_lc_all]} {
			set env(LC_ALL) $old_lc_all
		    } else {
			unset env(LC_ALL)
		    }
		    set comp_output [prune_warnings $comp_output]

		    if ![string match "" $comp_output] then {
			send_log "$comp_output\n"
			set failed 1
			break
		    }

		    if { [regexp_diff "dump.out" "$srcdir/$subdir/$dumpfile"] } then {
			verbose "output is [file_contents "dump.out"]" 2
			set failed 1
			break
		    }
		}
	    }
	}

	if { $failed } {
	    fail $testname
	} elseif { $is_unresolved } {
	    unresolved $testname
	} else {
	    pass $testname
	}
    }
}

# Returns true if --gc-sections is supported on the target.

proc check_gc_sections_available { } {
    global gc_sections_available_saved
    global ld

    if {![info exists gc_sections_available_saved]} {
	# Some targets don't support gc-sections despite whatever's
	# advertised by ld's options.
	if {   [istarget alpha-*-*]
	    || [istarget bpf-*-*]
	    || [istarget d30v-*-*]
	    || [istarget dlx-*-*]
	    || [istarget hppa*64-*-*]
	    || [istarget ia64-*-*]
	    || [istarget mep-*-*]
	    || [istarget mn10200-*-*]
	    || [istarget pj*-*-*]
	    || [istarget s12z-*-*]
	    || [istarget xgate-*-*]
	    || [istarget z80-*-*] } {
	    set gc_sections_available_saved 0
	    return 0
	}

	# elf2flt uses -q (--emit-relocs), which is incompatible with
	# --gc-sections.
	if { [board_info target exists ldflags]
	     && [regexp " -elf2flt\[ =\]" " [board_info target ldflags] "] } {
	    set gc_sections_available_saved 0
	    return 0
	}

	# Check if the ld used by gcc supports --gc-sections.
	# FIXME: this test is useless since ld --help always says
	# --gc-sections is available
	set ld_output [remote_exec host $ld "--help"]
	if { [ string first "--gc-sections" $ld_output ] >= 0 } {
	    set gc_sections_available_saved 1
	} else {
	    set gc_sections_available_saved 0
	}
    }
    return $gc_sections_available_saved
}

# Return true if target uses genelf.em.
proc uses_genelf { } {
    if { [istarget "d30v-*-*"]
	 || [istarget "dlx-*-*"]
	 || [istarget "fr30-*-*"]
	 || ([istarget "frv-*-*"] && ![istarget "frv-*-linux*"])
	 || [istarget "ft32-*-*"]
	 || [istarget "iq2000-*-*"]
	 || [istarget "mn10200-*-*"]
	 || [istarget "msp430-*-*"]
	 || [istarget "mt-*-*"]
	 || [istarget "pj*-*-*"]
	 || [istarget "s12z-*-*"]
	 || [istarget "xgate-*-*"] } {
	return 1
    }
    return 0
}

proc is_underscore_target { } {
    global is_underscore_target_saved
    global target_triplet
    global srcdir

    if { ![info exists is_underscore_target_saved] } {
	set cmd "targ=$target_triplet . $srcdir/../../bfd/config.bfd &&"
	append cmd { echo "$targ_underscore"}
	verbose -log "$cmd"
	set status [catch {exec sh -c $cmd} result]
	if { $status == 0 && [string match "yes" $result] } {
	    set is_underscore_target_saved 1
	} else {
	    set is_underscore_target_saved 0
	}
    }
    return $is_underscore_target_saved
}

# Returns true if the target ld supports the plugin API.
proc check_plugin_api_available { } {
    global plugin_api_available_saved
    global ld
    if {![info exists plugin_api_available_saved]} {
	# Check if the ld used by gcc supports --plugin.
	set ld_output [remote_exec host $ld "--help"]
	if { [regexp -- "-plugin PLUGIN \[^\n\r\]*" $ld_output line]
	     && ![regexp "ignored" $line] } {
	    set plugin_api_available_saved 1
	} else {
	    set plugin_api_available_saved 0
	}
    }
    return $plugin_api_available_saved
}

# Sets ld_sysroot to the current sysroot (empty if not supported) and
# returns true if the target ld supports sysroot.
proc check_sysroot_available { } {
    global ld_sysroot_available_saved ld ld_sysroot
    if {![info exists ld_sysroot_available_saved]} {
	# Check if ld supports --sysroot *other* than empty.
	set ld_sysroot [string trimright [lindex [remote_exec host $ld "--print-sysroot"] 1]]
	if { $ld_sysroot == "" } {
	    set ld_sysroot_available_saved 0
	} else {
	    set ld_sysroot_available_saved 1
	}
    }
    return $ld_sysroot_available_saved
}

# Return true if we can build a program with the compiler.
# On some targets, CC might be defined, but libraries and startup
# code might be missing or require special options that the ld test
# harness doesn't know about.

proc check_compiler_available { } {
    global compiler_available_saved
    global CC_FOR_TARGET

    if {![info exists compiler_available_saved]} {
	if { [which $CC_FOR_TARGET] == 0 } {
	    set compiler_available_saved 0
	    return 0
	}

	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/compiler[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	puts $f "int main (void)"
	puts $f "{"
	puts $f "  return 0; "
	puts $f "}"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set compiler_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $src -o $output"]
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $compiler_available_saved
}

# Returns 1 if plugin is enabled in gcc.  Returns 0 otherwise.
proc check_gcc_plugin_enabled { } {
    global CC_FOR_TARGET

    if {![info exists CC_FOR_TARGET]} {
	set CC_FOR_TARGET [find_gcc]
    }
    if { $CC_FOR_TARGET == ""} {
	return 0
    }
    # Filter out -Wl, options.
    regsub -all -- "-Wl,\[^ ^\t\]+" $CC_FOR_TARGET "" cc_cmd
    set state [remote_exec host $cc_cmd -v]
    if { [lindex $state 0] != 0 } {
	return 0;
    }
    for { set i 1 } { $i < [llength $state] } { incr i } {
	set v [lindex $state $i]
	if { [ string match "*--disable-plugin*" $v ] } {
	    verbose "plugin is disabled by $v"
	    return 0;
	}
    }

    return 1;
}

# Returns true if the target compiler supports LTO
proc check_lto_available { } {
    global lto_available_saved
    global CC_FOR_TARGET

    if {![info exists lto_available_saved]} {
	if { ![check_gcc_plugin_enabled] } {
	    set lto_available_saved 0
	    return 0
	}
	# This test will hide LTO bugs in ld.  Since GCC 4.9 adds
	# -ffat-lto-objects, we always run LTO tests on Linux with
	# GCC 4.9 or newer.
	if { [istarget "*-*-linux*"] && [at_least_gcc_version 4 9] } {
	    set lto_available_saved 1
	    return 1
	}
	# Check if gcc supports -flto -fuse-linker-plugin
	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/lto[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	puts $f "int main() { return 0; }"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set lto_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags -flto -fuse-linker-plugin $src -o $output"]
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $lto_available_saved
}

# Returns true if the target compiler supports LTO  -ffat-lto-objects
proc check_lto_fat_available { } {
    global lto_fat_available_saved
    global CC_FOR_TARGET

    if {![info exists lto_fat_available_saved]} {
	if { ![check_gcc_plugin_enabled] } {
	    set lto_fat_available_saved 0
	    return 0
	}
	# This test will hide LTO bugs in ld.  Since GCC 4.9 adds
	# -ffat-lto-objects, we always run LTO tests on Linux with
	# GCC 4.9 or newer.
	if { [istarget "*-*-linux*"] && [at_least_gcc_version 4 9] } {
	    set lto_fat_available_saved 1
	    return 1
	}
	# Check if gcc supports -flto -fuse-linker-plugin
	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/lto[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	puts $f "int main() { return 0; }"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set lto_fat_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags -flto -ffat-lto-objects -fuse-linker-plugin $src -o $output"]
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $lto_fat_available_saved
}

# Returns true if the target compiler supports LTO and -shared
proc check_lto_shared_available { } {
    global lto_shared_available_saved
    global CC_FOR_TARGET

    if {![info exists lto_shared_available_saved]} {
	if { ![check_gcc_plugin_enabled] } {
	    set lto_shared_available_saved 0
	    return 0
	}
	# This test will hide LTO bugs in ld.  Since GCC 4.9 adds
	# -ffat-lto-objects, we always run LTO tests on Linux with
	# GCC 4.9 or newer.
	if { [istarget "*-*-linux*"] && [at_least_gcc_version 4 9] } {
	    set lto_shared_available_saved 1
	    return 1
	}
	# Check if gcc supports -flto -fuse-linker-plugin -shared
	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/lto_shared[pid]"
	set src ${basename}.c
	set output ${basename}.so
	set f [open $src "w"]
	puts $f ""
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set lto_shared_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags -shared -fPIC -flto -fuse-linker-plugin $src -o $output"]
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $lto_shared_available_saved
}

# Check if the assembler supports CFI statements.

proc check_as_cfi { } {
    global check_as_cfi_result
    global as
    if [info exists check_as_cfi_result] {
	return $check_as_cfi_result
    }
    set as_file "tmpdir/check_as_cfi.s"
    set as_fh [open $as_file w 0666]
    puts $as_fh "# Generated file. DO NOT EDIT"
    puts $as_fh "\t.cfi_startproc"
    puts $as_fh "\t.cfi_endproc"
    close $as_fh
    remote_download host $as_file
    verbose -log "Checking CFI support:"
    set success [ld_assemble $as $as_file "/dev/null"]
    #remote_file host delete $as_file
    set check_as_cfi_result $success
    return $success
}

# Returns true if IFUNC works.

proc check_ifunc_available { } {
    global ifunc_available_saved
    global CC_FOR_TARGET

    if {![info exists ifunc_available_saved]} {
	if { ![check_compiler_available] } {
	    set ifunc_available_saved 0
	    return 0
	}
	# Check if gcc supports -flto -fuse-linker-plugin
	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/ifunc[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	puts $f "extern int library_func2 (void);"
	puts $f "int main (void)"
	puts $f "{"
	puts $f "  if (library_func2 () != 2) __builtin_abort ();"
	puts $f "  return 0; "
	puts $f "}"
	puts $f "static int library_func1 (void) {return 2; }"
	puts $f "void *foo (void) __asm__ (\"library_func2\");"
	puts $f "void *foo (void) { return library_func1; }"
	puts $f "__asm__(\".type library_func2, %gnu_indirect_function\");"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set ifunc_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $src -o $output"]
	if { [isnative] && $ifunc_available_saved == 1 } {
	  set ifunc_available_saved [run_host_cmd_yesno "$output" ""]
	}
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $ifunc_available_saved
}

# Returns true if ifunc attribute works.

proc check_ifunc_attribute_available { } {
    global ifunc_attribute_available_saved
    global CC_FOR_TARGET

    if {![info exists ifunc_attribute_available_saved]} {
	if { ![check_compiler_available] } {
	    set ifunc_attribute_available_saved 0
	    return 0
	}
	# Check if gcc supports -flto -fuse-linker-plugin
	set flags ""
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/ifunc[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	puts $f "extern int library_func2 (void) __attribute__ ((ifunc (\"foo\")));"
	puts $f "int main (void)"
	puts $f "{"
	puts $f "  if (library_func2 () != 2) __builtin_abort ();"
	puts $f "  return 0; "
	puts $f "}"
	puts $f "static int library_func1 (void) {return 2; }"
	puts $f "void *foo (void) { return library_func1; }"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set ifunc_attribute_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $src -o $output"]
	if { [isnative] && $ifunc_attribute_available_saved == 1 } {
	  set ifunc_attribute_available_saved [run_host_cmd_yesno "$output" ""]
	}
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $ifunc_attribute_available_saved
}

# Return true if libdl is supported.

proc check_libdl_available { } {
    global libdl_available_saved
    global CC_FOR_TARGET

    if {![info exists libdl_available_saved]} {
	if { ![check_compiler_available] } {
	    set libdl_available_saved 0
	    return 0
	}

	set basename "tmpdir/dl_avail_test[pid]"
	set src ${basename}.c
	set output ${basename}.out
	set f [open $src "w"]
	# Sample test file.
	puts $f "#include <dlfcn.h>"
	puts $f "int main (void)"
	puts $f "{"
	puts $f "  dlopen (\"dummy.so\", RTLD_NOW);"
	puts $f "  return 0; "
	puts $f "}"
	close $f
	if [is_remote host] {
	    set src [remote_download host $src]
	}
	set libdl_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$src -o $output -ldl"]
	remote_file host delete $src
	remote_file host delete $output
	file delete $src
    }
    return $libdl_available_saved
}

# Returns true if GNU2 TLS works.

proc check_gnu2_tls_available { } {
    global gnu2_tls_available_saved
    global CC_FOR_TARGET
    global GNU2_CFLAGS

    if {![info exists gnu2_tls_available_saved]} {
	if { ![check_compiler_available] || "$GNU2_CFLAGS" == "" } {
	    set gnu2_tls_available_saved 0
	    return 0
	}
	# Check if GNU2 TLS works.
	set flags "$GNU2_CFLAGS"
	if [board_info [target_info name] exists cflags] {
	    append flags " [board_info [target_info name] cflags]"
	}
	if [board_info [target_info name] exists ldflags] {
	    append flags " [board_info [target_info name] ldflags]"
	}

	set basename "tmpdir/gnu2_tls[pid]"
	set src1 ${basename}1.c
	set output1 ${basename}.so
	set f [open $src1 "w"]
	puts $f "extern __thread int zzz;"
	puts $f "int foo (void)"
	puts $f "{"
	puts $f "  return zzz;"
	puts $f "}"
	close $f
	if [is_remote host] {
	    set src1 [remote_download host $src1]
	}
	set src2 ${basename}2.c
	set output2 ${basename}.exe
	set f [open $src2 "w"]
	puts $f "__thread int zzz = 20;"
	puts $f "extern int foo (void);"
	puts $f "int main (void)"
	puts $f "{"
	puts $f "  if (foo () != 20) __builtin_abort ();"
	puts $f "  return 0; "
	puts $f "}"
	close $f
	if [is_remote host] {
	    set src2 [remote_download host $src2]
	}
	set gnu2_tls_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "-fPIC -shared $flags $src1 -o $output1"]
	if { $gnu2_tls_available_saved == 1 } {
	    set gnu2_tls_available_saved [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $src2 $output1 -o $output2"]
	    if { $gnu2_tls_available_saved == 1 } {
		set gnu2_tls_available_saved [run_host_cmd_yesno "$output2" ""]
	    }
	}
	remote_file host delete $src1
	remote_file host delete $output1
	remote_file host delete $src2
	remote_file host delete $output2
	file delete $src1 $src2
    }
    return $gnu2_tls_available_saved
}

# Compile a C source file, with the specified additional_flags.
proc compile_one_cc { src output additional_flags } {
    global CC_FOR_TARGET
    global CFLAGS_FOR_TARGET

    set flags ""
    if [board_info [target_info name] exists cflags] {
	append flags " [board_info [target_info name] cflags]"
    }
    if [board_info [target_info name] exists ldflags] {
	append flags " [board_info [target_info name] ldflags]"
    }

    if [is_remote host] {
	set src [remote_download host $src]
    }
    return [run_host_cmd_yesno "$CC_FOR_TARGET" "$flags $CFLAGS_FOR_TARGET $additional_flags $src -o $output"]
}

# Returns true if the target compiler supports -gctf.
proc check_ctf_available { } {
    global ctf_available_saved

    if {![info exists ctf_available_saved]} {
	set ctf_available_saved 0

	# Don't check for compiler availability, because that FNs if the
	# compiler is available but emits warnings.  An unavailable
	# compiler will fail this test anyway.

	if ([check_compiler_available]) {
	    set basename "tmpdir/ctf_available[pid]"
	    set src ${basename}.c
	    set output ${basename}.s
	    set f [open $src "w"]
	    puts $f "int main() { return 0; }"
	    close $f
	    compile_one_cc $src $output "-gctf -S -c"
	    remote_file host delete $src
	    if {! [remote_file host exists $output] } {
		file delete $src
		return 0
	    }
	    set status [remote_exec host fgrep ".ctf $output"]
	    remote_file host delete $output
	    file delete $src
	    if { [lindex $status 0] == 0 } {
		set ctf_available_saved 1
	    }
	}
    }
    return $ctf_available_saved
}

proc skip_ctf_tests { } {
    global enable_libctf

    if {$enable_libctf eq "no"} {
	return 1
    }

    if [check_ctf_available] {
	return 0
    }

    return 1
}

# Check if the assembler supports SFrame.

proc check_as_sframe { } {
    global check_as_sframe_result
    global as
    if [info exists check_as_sframe_result] {
	return $check_as_sframe_result
    }

    # SFrame generation needs CFI support
    if { ![check_as_cfi] } {
	set check_as_sframe_result 0;
	return 0
    }

    set as_file "tmpdir/check_as_sframe.s"
    set as_fh [open $as_file w 0666]
    puts $as_fh "# Generated file. DO NOT EDIT"
    puts $as_fh "\t.cfi_sections \".sframe\""
    puts $as_fh "\t.cfi_startproc"
    puts $as_fh "\t.cfi_endproc"
    close $as_fh
    remote_download host $as_file
    verbose -log "Checking SFrame:"
    set success [ld_assemble $as $as_file "/dev/null"]
    #remote_file host delete $as_file
    set check_as_sframe_result $success
    return $success
}

proc skip_sframe_tests { } {
# FIXME TODO
#    global enable_libsframe
#
#    if {$enable_libsframe eq "no"} {
#	return 1
#    }

    if [check_as_sframe] {
	return 0
    }

    return 1
}