X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=ld%2Ftestsuite%2Flib%2Fld-lib.exp;h=7b190bee2a6e787819afe719a7a90bdd3d261bdc;hb=8be1e36919a884152d7115f4f4b8c0cfcf086a1f;hp=ffdf8051f3191e00433b632810c25f68b3b6494c;hpb=bdd65db9b9cd6d5dbdff9b48e97379029f8a3a1a;p=deliverable%2Fbinutils-gdb.git

diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index ffdf8051f3..7b190bee2a 100644
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -1,5 +1,5 @@
 # Support routines for LD testsuite.
-#   Copyright (C) 1994-2014 Free Software Foundation, Inc.
+#   Copyright (C) 1994-2016 Free Software Foundation, Inc.
 #
 # This file is part of the GNU Binutils.
 #
@@ -29,14 +29,18 @@ load_common_lib binutils-common.exp
 # Returns 0 otherwise.
 #
 proc at_least_gcc_version { major minor } {
+    global CC
 
     if {![info exists CC]} {
 	set CC [find_gcc]
     }
     if { $CC == "" } {
-      return 0
+	return 0
     }
     set state [remote_exec host $CC --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 "\[^\\.0-9\]+(\[1-9\]\[0-9\]*)\\.(\[0-9\]+)(?:\\.\[0-9\]+)?"
@@ -125,8 +129,12 @@ proc run_host_cmd { prog command } {
 
 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;
     }
@@ -509,6 +517,7 @@ proc ld_simple_link_defsyms {} {
 #       run_dump_test will guess which program to run by seeing which of
 #       the flags options below is present.
 #
+#   readelf: FLAGS
 #   objdump: FLAGS
 #   nm: FLAGS
 #   objcopy: FLAGS
@@ -545,15 +554,31 @@ proc ld_simple_link_defsyms {} {
 #
 #   error: REGEX
 #	An error with message matching REGEX must be emitted for the test
-#	to pass.  The PROG, objdump, nm and objcopy options have no
-#	meaning and need not supplied if this is present.  Multiple "error"
-#	directives append to the expected linker error message.
+#	to pass.  The PROG, readelf, objdump, nm and objcopy options have
+#	no meaning and need not be supplied if this is present.  Multiple
+#	"error" directives append to the expected linker error message.
+#
+#   error_output: FILE
+#       Means the same as 'error', except the regular expression lines
+#       are contains in FILE.
 #
 #   warning: REGEX
 #	Expect a linker warning matching REGEX.  It is an error to issue
 #	both "error" and "warning".  Multiple "warning" directives
 #	append to the expected linker warning message.
 #
+#   warning_output: FILE
+#       Means the same as 'warning', except the regular expression
+#       lines are contains in FILE.
+#
+#   map: FILE
+#       Adding this option will cause the linker to generate a linker
+#       map file, using the -Map=MAPFILE command line option.  If
+#       there is no -Map=MAPFILE in the 'ld: FLAGS' then one will be
+#       added to the linker command line.  The contents of the
+#       generated MAPFILE are then compared against the regexp lines
+#       in FILE using `regexp_diff' (see below for details).
+#
 # Each option may occur at most once unless otherwise mentioned.
 #
 # After the option lines come regexp lines.  `run_dump_test' calls
@@ -567,6 +592,13 @@ proc run_dump_test { name {extra_options {}} } {
     global OBJDUMPFLAGS NMFLAGS ASFLAGS OBJCOPYFLAGS READELFFLAGS LDFLAGS
     global host_triplet runtests
     global env verbose
+    global ld_elf_shared_opt
+
+    if { [is_elf_format] && [check_shared_lib_support] } {
+	set ld_extra_opt "$ld_elf_shared_opt"
+    } else {
+	set ld_extra_opt ""
+    }
 
     if [string match "*/*" $name] {
 	set file $name
@@ -604,8 +636,11 @@ proc run_dump_test { name {extra_options {}} } {
     set opts(dump) {}
     set opts(error) {}
     set opts(warning) {}
+    set opts(error_output) {}
+    set opts(warning_output) {}
     set opts(objcopy_linked_file) {}
     set opts(objcopy_objects) {}
+    set opts(map) {}
 
     foreach i $opt_array {
 	set opt_name [lindex $i 0]
@@ -710,7 +745,7 @@ proc run_dump_test { name {extra_options {}} } {
     set program ""
     # It's meaningless to require an output-testing method when we
     # expect an error.
-    if { $opts(error) == "" } {
+    if { $opts(error) == "" && $opts(error_output) == "" } {
 	if {$opts(PROG) != ""} {
 	    switch -- $opts(PROG) {
 		objdump	{ set program objdump }
@@ -736,7 +771,12 @@ proc run_dump_test { name {extra_options {}} } {
 		}
 	    }
 	}
-	if { $program == "" && $opts(warning) == "" } {
+	if { $program == "" \
+                 && $opts(map) == "" \
+                 && $opts(warning) == "" \
+                 && $opts(warning_output) == "" \
+                 && $opts(error) == "" \
+                 && $opts(error_output) == "" } {
 	    perror "dump program unspecified in $file.d"
 	    unresolved $subdir/$name
 	    return
@@ -769,12 +809,6 @@ proc run_dump_test { name {extra_options {}} } {
 	set dfile $srcdir/$subdir/$opts(dump)
     }
 
-    if { [string match "*--compress-debug-sections*" $opts(as)] \
-	 && ![is_zlib_supported] } {
-	unsupported $testname
-	return
-    }
-
     # Time to setup xfailures.
     foreach targ $opts(xfail) {
 	setup_xfail $targ
@@ -840,13 +874,45 @@ proc run_dump_test { name {extra_options {}} } {
 	}
     }
 
-    set expmsg $opts(error)
-    if { $opts(warning) != "" } {
-	if { $expmsg != "" } {
-	    perror "$testname: mixing error and warning test-directives"
-	    return
-	}
-	set expmsg $opts(warning)
+    if { (($opts(warning) != "") && ($opts(error) != "")) \
+	 || (($opts(warning) != "") && ($opts(error_output) != "")) \
+	 || (($opts(warning) != "") && ($opts(warning_output) != "")) \
+	 || (($opts(error) != "") && ($opts(warning_output) != "")) \
+	 || (($opts(error) != "") && ($opts(error_output) != "")) \
+	 || (($opts(warning_output) != "") && ($opts(error_output) != "")) } {
+	perror "$testname: bad mix of warning, error, warning_output, and error_output test-directives"
+	unresolved $testname
+	return
+    }
+
+    set check_ld(source) ""
+    set check_ld(terminal) 0
+    if { $opts(error) != "" \
+         || $opts(warning) != "" \
+         || $opts(error_output) != "" \
+         || $opts(warning_output) != "" } {
+
+        if { $opts(error) != "" || $opts(error_output) != "" } {
+            set check_ld(terminal) 1
+        } else {
+            set check_ld(terminal) 0
+        }
+
+        if { $opts(error) != "" || $opts(warning) != "" } {
+            set check_ld(source) "regex"
+            if { $opts(error) != "" } {
+                set check_ld(regex) $opts(error)
+            } else {
+                set check_ld(regex) $opts(warning)
+            }
+        } else {
+            set check_ld(source) "file"
+            if { $opts(error_output) != "" } {
+                set check_ld(file) $opts(error_output)
+            } else {
+                set check_ld(file) $opts(warning_output)
+            }
+        }
     }
 
     # Perhaps link the file(s).
@@ -856,9 +922,23 @@ proc run_dump_test { name {extra_options {}} } {
 
 	# Add -L$srcdir/$subdir so that the linker command can use
 	# linker scripts in the source directory.
-	set cmd "$LD $LDFLAGS -L$srcdir/$subdir \
+	set cmd "$LD $ld_extra_opt $LDFLAGS -L$srcdir/$subdir \
 		   $opts(ld) -o $objfile $objfiles $opts(ld_after_inputfiles)"
 
+        # If needed then check for, or add a -Map option.
+        set mapfile ""
+        if { $opts(map) != "" } then {
+            if { [regexp -- "-Map=(\[^ \]+)" $cmd all mapfile] } then {
+                # Found existing mapfile option
+                verbose -log "Existing mapfile '$mapfile' found"
+            } else {
+                # No mapfile option.
+                set mapfile "tmpdir/dump.map"
+                verbose -log "Adding mapfile '$mapfile'"
+                set cmd "$cmd -Map=$mapfile"
+            }
+        }
+
 	send_log "$cmd\n"
 	set cmdret [remote_exec host [concat sh -c [list "$cmd 2>&1"]] "" "/dev/null" "ld.tmp"]
 	remote_upload host "ld.tmp"
@@ -886,27 +966,53 @@ proc run_dump_test { name {extra_options {}} } {
 	}
 
 	regsub "\n$" $comp_output "" comp_output
-	if { $cmdret != 0 || $comp_output != "" || $expmsg != "" } then {
+	if { $cmdret != 0 || $comp_output != "" || $check_ld(source) != "" } then {
 	    set exitstat "succeeded"
 	    if { $cmdret != 0 } { set exitstat "failed" }
-	    verbose -log "$exitstat with: <$comp_output>, expected: <$expmsg>"
+
+            if { $check_ld(source) == "regexp" } {
+                verbose -log "$exitstat with: <$comp_output>, expected: <$check_ld(regex)>"
+            } elseif { $check_ld(source) == "file" } {
+                verbose -log "$exitstat with: <$comp_output>, expected in file $check_ld(file)"
+                set_file_contents "tmpdir/ld.messages" "$comp_output"
+            } else {
+                verbose -log "$exitstat with: <$comp_output>, no expected output"
+            }
 	    send_log "$comp_output\n"
 	    verbose "$comp_output" 3
 
-	    if { ($expmsg == "") == ($comp_output == "") \
-		    && [regexp $expmsg $comp_output] \
-		    && (($cmdret == 0) == ($opts(error) == "")) } {
-		# We have the expected output from ld.
-		if { $opts(error) != "" || $program == "" } {
+	    if { (($check_ld(source) == "") == ($comp_output == "")) \
+                 && (($cmdret == 0) == ($check_ld(terminal) == 0)) \
+                 && ((($check_ld(source) == "regex") \
+                      && ($check_ld(regex) == "") == ($comp_output == "") \
+                      && [regexp $check_ld(regex) $comp_output]) \
+                     || (($check_ld(source) == "file") \
+                         && (![regexp_diff "tmpdir/ld.messages" "$srcdir/$subdir/$check_ld(file)"]))) } {
+                # We have the expected output from ld.
+		if { $check_ld(terminal) || $program == "" } {
 		    pass $testname
 		    return
 		}
 	    } else {
-		verbose -log "$exitstat with: <$comp_output>, expected: <$expmsg>"
 		fail $testname
 		return
 	    }
 	}
+
+        if { $opts(map) != "" } then {
+            # Check the map file matches.
+            set map_pattern_file $srcdir/$subdir/$opts(map)
+            verbose -log "Compare '$mapfile' against '$map_pattern_file'"
+            if { [regexp_diff $mapfile $map_pattern_file] } then {
+                fail "$testname (map file check)"
+            } else {
+                pass "$testname (map file check)"
+            }
+
+            if { $program == "" } then {
+                return
+            }
+        }
     } else {
 	set objfile "tmpdir/dump0.o"
     }
@@ -1023,7 +1129,7 @@ proc set_file_contents { filename contents } {
 proc ar_simple_create { ar aropts target objects } {
     remote_file host delete $target
 
-    set exec_output [run_host_cmd "$ar" "$aropts -rc $target $objects"]
+    set exec_output [run_host_cmd "$ar" "-rc $aropts $target $objects"]
     set exec_output [prune_warnings $exec_output]
 
     if [string match "" $exec_output] then {
@@ -1056,7 +1162,9 @@ proc ar_simple_create { ar aropts target objects } {
 #     in all other cases, any output from the linker during linking is
 #     treated as a sign of an error and FAILs the test.
 #
-proc run_ld_link_tests { ldtests } {
+# args is an optional list of target triplets to be xfailed.
+#
+proc run_ld_link_tests { ldtests args } {
     global ld
     global as
     global nm
@@ -1070,6 +1178,13 @@ proc run_ld_link_tests { ldtests } {
     global CFLAGS
     global runtests
     global exec_output
+    global ld_elf_shared_opt
+
+    if { [is_elf_format] && [check_shared_lib_support] } {
+	set ld_extra_opt "$ld_elf_shared_opt"
+    } else {
+	set ld_extra_opt ""
+    }
 
     foreach testitem $ldtests {
 	set testname [lindex $testitem 0]
@@ -1078,6 +1193,10 @@ proc run_ld_link_tests { ldtests } {
 	    continue
 	}
 
+	foreach target $args {
+	    setup_xfail $target
+	}
+
 	set ld_options [lindex $testitem 1]
 	set ld_after [lindex $testitem 2]
 	set as_options [lindex $testitem 3]
@@ -1132,7 +1251,7 @@ proc run_ld_link_tests { ldtests } {
 	    if { ![ar_simple_create $ar $ld_options $binfile "$objfiles $ld_after"] } {
 		set failed 1
 	    }
-	} elseif { ![ld_simple_link $ld $binfile "-L$srcdir/$subdir $ld_options $objfiles $ld_after"] } {
+	} elseif { ![ld_simple_link $ld $binfile "$ld_extra_opt -L$srcdir/$subdir $ld_options $objfiles $ld_after"] } {
 	    set maybe_failed 1
 	    set ld_output "$exec_output"
 	}
@@ -1251,7 +1370,6 @@ if ![string length [info proc prune_warnings]] {
     }
 }
 
-# targets_to_xfail is a list of target triplets to be xfailed.
 # ldtests contains test-items with 3 items followed by 1 lists, 2 items
 # and 3 optional items:
 #   0:name
@@ -1263,8 +1381,9 @@ if ![string length [info proc prune_warnings]] {
 #   6:compiler flags (optional)
 #   7:language (optional)
 #   8:linker warning (optional)
+# args is an optional list of target triplets to be xfailed.
 
-proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
+proc run_ld_link_exec_tests { ldtests args } {
     global ld
     global as
     global srcdir
@@ -1278,7 +1397,7 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
     global exec_output
 
     foreach testitem $ldtests {
-	foreach target $targets_to_xfail {
+	foreach target $args {
 	    setup_xfail $target
 	}
 	set testname [lindex $testitem 0]
@@ -1410,6 +1529,13 @@ proc run_cc_link_tests { ldtests } {
     global CXXFLAGS
     global ar
     global exec_output
+    global board_cflags
+
+    if [board_info [target_info name] exists cflags] {
+        set board_cflags " [board_info [target_info name] cflags]"
+    } else {
+	set board_cflags ""
+    }
 
     foreach testitem $ldtests {
 	set testname [lindex $testitem 0]
@@ -1466,7 +1592,7 @@ proc run_cc_link_tests { ldtests } {
 		set failed 1
 	    }
 	} else {
-	    if { ![ld_simple_link $cc_cmd $binfile "-L$srcdir/$subdir $ldflags $objfiles"] } {
+	    if { ![ld_simple_link $cc_cmd $binfile "$board_cflags -L$srcdir/$subdir $ldflags $objfiles"] } {
 		set failed 1
 	    }
 
@@ -1563,8 +1689,7 @@ proc check_gc_sections_available { } {
     if {![info exists gc_sections_available_saved]} {
 	# Some targets don't support gc-sections despite whatever's
 	# advertised by ld's options.
-	if {   [istarget arc-*-*]
-	    || [istarget d30v-*-*]
+	if {   [istarget d30v-*-*]
 	    || [istarget dlx-*-*]
 	    || [istarget i960-*-*]
 	    || [istarget pj*-*-*]
@@ -1574,9 +1699,7 @@ proc check_gc_sections_available { } {
 	    || [istarget i860-*-*]
 	    || [istarget ia64-*-*]
 	    || [istarget mep-*-*]
-	    || [istarget mn10200-*-*]
-	    || [istarget *-*-cygwin]
-	    || [istarget *-*-mingw*] } {
+	    || [istarget mn10200-*-*] } {
 	    set gc_sections_available_saved 0
 	    return 0
 	}
@@ -1607,7 +1730,7 @@ proc check_gc_sections_available { } {
 
 proc check_shared_lib_support { } {
     if {![istarget aarch64*-*-elf]
-	 && ![istarget arc-*-*]
+	 && ![istarget arc*-*-elf*]
 	 && ![istarget arm*-*-elf]
 	 && ![istarget avr-*-*]
 	 && ![istarget cr16-*-*]
@@ -1619,6 +1742,7 @@ proc check_shared_lib_support { } {
 	 && ![istarget epiphany-*-*]
 	 && ![istarget fr30-*-*]
 	 && ![istarget frv-*-*]
+	 && ![istarget ft32-*-*]
 	 && ![istarget h8300-*-*]
 	 && ![istarget i860-*-*]
 	 && ![istarget i960-*-*]
@@ -1645,6 +1769,8 @@ proc check_shared_lib_support { } {
 	 && ![istarget rx-*-*]
 	 && ![istarget spu-*-*]
 	 && ![istarget v850*-*-*]
+	 && ![istarget visium-*-*]
+	 && ![istarget xgate-*-*]
 	 && ![istarget xstormy16-*-*]
 	 && ![istarget *-*-irix*]
 	 && ![istarget *-*-rtems] } {
@@ -1669,16 +1795,14 @@ proc check_plugin_api_available { } {
     return $plugin_api_available_saved
 }
 
-# Returns true if the target ld supports sysroot.
+# 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
-    global ld
+    global ld_sysroot_available_saved ld ld_sysroot
     if {![info exists ld_sysroot_available_saved]} {
-	# Check if ld supports --sysroot *other* than empty
-	# (non-sysroot linkers don't emit errors for --sysroot="").
-	# The help-text by itself is no indication as it always lists --sysroot.
-	set status [remote_exec host $ld "--sysroot=ldxyzzy --help >/dev/null"]
-	if { [lindex $status 0] != 0 } {
+	# 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
@@ -1687,16 +1811,48 @@ proc check_sysroot_available { } {
     return $ld_sysroot_available_saved
 }
 
+# Returns 1 if plugin is enabled in gcc.  Returns 0 otherwise.
+proc check_gcc_plugin_enabled { } {
+    global CC
+
+    if {![info exists CC]} {
+	set CC [find_gcc]
+    }
+    if { $CC == ""} {
+	return 0
+    }
+    set state [remote_exec host $CC -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
 
     if {![info exists lto_available_saved]} {
-        if { [which $CC] == 0 } {
+        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] {
@@ -1712,7 +1868,9 @@ proc check_lto_available { } {
 	set f [open $src "w"]
 	puts $f "int main() { return 0; }"
 	close $f
-	remote_download host $src
+	if [is_remote host] {
+	    set src [remote_download host $src]
+	}
 	set lto_available_saved [run_host_cmd_yesno "$CC" "$flags -flto -fuse-linker-plugin $src -o $output"]
 	remote_file host delete $src
 	remote_file host delete $output
@@ -1727,10 +1885,17 @@ proc check_lto_fat_available { } {
     global CC
 
     if {![info exists lto_fat_available_saved]} {
-        if { [which $CC] == 0 } {
+        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] {
@@ -1746,7 +1911,9 @@ proc check_lto_fat_available { } {
 	set f [open $src "w"]
 	puts $f "int main() { return 0; }"
 	close $f
-	remote_download host $src
+	if [is_remote host] {
+	    set src [remote_download host $src]
+	}
 	set lto_fat_available_saved [run_host_cmd_yesno "$CC" "$flags -flto -ffat-lto-objects -fuse-linker-plugin $src -o $output"]
 	remote_file host delete $src
 	remote_file host delete $output
@@ -1761,10 +1928,17 @@ proc check_lto_shared_available { } {
     global CC
 
     if {![info exists lto_shared_available_saved]} {
-        if { [which $CC] == 0 } {
+        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] {
@@ -1780,7 +1954,9 @@ proc check_lto_shared_available { } {
 	set f [open $src "w"]
 	puts $f ""
 	close $f
-	remote_download host $src
+	if [is_remote host] {
+	    set src [remote_download host $src]
+	}
 	set lto_shared_available_saved [run_host_cmd_yesno "$CC" "$flags -shared -fPIC -flto -fuse-linker-plugin $src -o $output"]
 	remote_file host delete $src
 	remote_file host delete $output
@@ -1815,6 +1991,102 @@ proc check_as_cfi { } {
     return $success
 }
 
+# Returns true if IFUNC works.
+
+proc check_ifunc_available { } {
+    global ifunc_available_saved
+    global CC
+
+    if {![info exists ifunc_available_saved]} {
+        if { [which $CC] == 0 } {
+	    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" "$flags $src -o $output"]
+	if { $ifunc_available_saved == 1 } {
+	  set ifunc_available_saved [run_host_cmd_yesno "$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
+
+    if {![info exists ifunc_attribute_available_saved]} {
+        if { [which $CC] == 0 } {
+	    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" "$flags $src -o $output"]
+	if { $ifunc_attribute_available_saved == 1 } {
+	  set ifunc_attribute_available_saved [run_host_cmd_yesno "$output" ""]
+	}
+	remote_file host delete $src
+	remote_file host delete $output
+	file delete $src
+    }
+    return $ifunc_attribute_available_saved
+}
+
 # Provide virtual target "cfi" for targets supporting CFI.
 
 rename "istarget" "istarget_ld"