X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=ld%2Ftestsuite%2Flib%2Fld-lib.exp;h=b60fcadf0582357ab6b12d4418b903b9afc06326;hb=6f9dbcd42f2cf034a9a21f46842c08d2e88449db;hp=07ed74735119e698f6b66944b2ee409808c2af8b;hpb=d1f70bdcab6cffce423617c6e081a5128d9dabe0;p=binutils-gdb.git

diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index 07ed7473511..b60fcadf058 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) 1994-2016 Free Software Foundation, Inc.
+#   Copyright (C) 1994-2017 Free Software Foundation, Inc.
 #
 # This file is part of the GNU Binutils.
 #
@@ -35,9 +35,12 @@ proc at_least_gcc_version { major minor } {
 	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 "\[^\\.0-9\]+(\[1-9\]\[0-9\]*)\\.(\[0-9\]+)(?:\\.\[0-9\]+)?"
@@ -196,41 +199,9 @@ proc big_or_little_endian {} {
     return $flags
 }
 
-# Link a program using ld.
+# Link a program using ld
 #
 proc default_ld_link { ld target objects } {
-    global HOSTING_EMU
-    global HOSTING_CRT0
-    global HOSTING_SCRT0
-    global HOSTING_LIBS
-    global HOSTING_SLIBS
-    global LIBS
-    global host_triplet
-    global link_output
-    global exec_output
-
-    if { [ string match "* -pie *" $objects ] } {
-	set objs "$HOSTING_SCRT0 $objects"
-	set libs "$LIBS $HOSTING_SLIBS"
-    } else {
-	set objs "$HOSTING_CRT0 $objects"
-	set libs "$LIBS $HOSTING_LIBS"
-    }
-
-    if [is_endian_output_format $objects] then {
-	set flags [big_or_little_endian]
-    } else {
-	set flags ""
-    }
-
-    remote_file host delete $target
-
-    return [run_host_cmd_yesno "$ld" "$HOSTING_EMU $flags -o $target $objs $libs"]
-}
-
-# Link a program using ld, without including any libraries.
-#
-proc default_ld_simple_link { ld target objects } {
     global host_triplet
     global exec_output
 
@@ -311,6 +282,11 @@ proc default_ld_compile { cc source object } {
     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
@@ -406,7 +382,7 @@ proc default_ld_nm { nm nmflags object } {
 
 # Define various symbols needed when not linking against all
 # target libs.
-proc ld_simple_link_defsyms {} {
+proc ld_link_defsyms {} {
 
     set flags "--defsym __stack_chk_fail=0"
 
@@ -589,6 +565,13 @@ 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
@@ -610,6 +593,7 @@ proc run_dump_test { name {extra_options {}} } {
     set dumpfile tmpdir/dump.out
     set run_ld 0
     set run_objcopy 0
+    set objfile_names {}
     set opts(as) {}
     set opts(ld) {}
     set opts(ld_after_inputfiles) {}
@@ -656,6 +640,22 @@ proc run_dump_test { name {extra_options {}} } {
 		} else {
 		    lappend asflags {}
 		}
+
+                # Create the object file name based on nothing but the source
+                # file name.
+                set new_objfile \
+                    [concat tmpdir/[file rootname [file tail [lindex $opt_val 0]]].o]
+                # But, sometimes, we have the exact same source filename in
+                # different directories (foo/src.s bar/src.s) which would lead
+                # us to try and create two src.o files.  We detect this
+                # conflict here, and instead create src.o and src1.o.
+                set j 0
+                while { [lsearch $objfile_names $new_objfile] != -1 } {
+                    incr j
+                    set new_objfile \
+                        [concat tmpdir/[file rootname [file tail  [lindex $opt_val 0]]]${j}.o]
+                }
+		lappend objfile_names $new_objfile
 	    }
 	    default {
 		if [string length $opts($opt_name)] {
@@ -782,6 +782,7 @@ proc run_dump_test { name {extra_options {}} } {
     if { $opts(source) == "" } {
 	set sourcefiles [list ${file}.s]
 	set asflags [list ""]
+	set objfile_names [list tmpdir/[file tail ${file}].o]
     } else {
 	set sourcefiles {}
 	foreach sf $opts(source) {
@@ -816,7 +817,7 @@ proc run_dump_test { name {extra_options {}} } {
 	}
 	regsub "RUN_OBJCOPY" $sourceasflags "" sourceasflags
 
-	set objfile "tmpdir/dump$i.o"
+	set objfile [lindex $objfile_names $i]
 	catch "exec rm -f $objfile" exec_output
 	lappend objfiles $objfile
 	set cmd "$AS $ASFLAGS $opts(as) $sourceasflags -o $objfile $sourcefile"
@@ -829,7 +830,7 @@ proc run_dump_test { name {extra_options {}} } {
 	remote_file build delete "ld.tmp"
 
 	if { [lindex $cmdret 0] != 0 || ![string match "" $comp_output] } then {
-	    send_log "$comp_output\n"
+	    send_log -- "$comp_output\n"
 	    verbose "$comp_output" 3
 
 	    set exitstat "succeeded"
@@ -852,7 +853,7 @@ proc run_dump_test { name {extra_options {}} } {
 
 	    if { [lindex $cmdret 0] != 0 \
 		  || ![string match "" $comp_output] } {
-		send_log "$comp_output\n"
+		send_log -- "$comp_output\n"
 		verbose "$comp_output" 3
 
 		set exitstat "succeeded"
@@ -912,7 +913,7 @@ 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.
@@ -960,7 +961,7 @@ proc run_dump_test { name {extra_options {}} } {
 	    set exitstat "succeeded"
 	    if { $cmdret != 0 } { set exitstat "failed" }
 
-            if { $check_ld(source) == "regexp" } {
+            if { $check_ld(source) == "regex" } {
                 verbose -log "$exitstat with: <$comp_output>, expected: <$check_ld(regex)>"
             } elseif { $check_ld(source) == "file" } {
                 verbose -log "$exitstat with: <$comp_output>, expected in file $check_ld(file)"
@@ -968,7 +969,7 @@ proc run_dump_test { name {extra_options {}} } {
             } else {
                 verbose -log "$exitstat with: <$comp_output>, no expected output"
             }
-	    send_log "$comp_output\n"
+	    send_log -- "$comp_output\n"
 	    verbose "$comp_output" 3
 
 	    if { (($check_ld(source) == "") == ($comp_output == "")) \
@@ -1004,7 +1005,7 @@ proc run_dump_test { name {extra_options {}} } {
             }
         }
     } else {
-	set objfile "tmpdir/dump0.o"
+	set objfile [lindex $objfiles 0]
     }
 
     # We must not have expected failure if we get here.
@@ -1152,7 +1153,9 @@ 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
@@ -1166,6 +1169,13 @@ 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]
@@ -1174,6 +1184,10 @@ 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]
@@ -1228,7 +1242,7 @@ 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_link $ld $binfile "$ld_extra_opt -L$srcdir/$subdir $ld_options $objfiles $ld_after"] } {
 	    set maybe_failed 1
 	    set ld_output "$exec_output"
 	}
@@ -1347,7 +1361,6 @@ 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
@@ -1359,8 +1372,9 @@ 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
@@ -1372,9 +1386,20 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
     global CXXFLAGS
     global errcnt
     global exec_output
+    global board_cflags
+
+    # 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 ""
+    }
 
     foreach testitem $ldtests {
-	foreach target $targets_to_xfail {
+	foreach target $args {
 	    setup_xfail $target
 	}
 	set testname [lindex $testitem 0]
@@ -1401,37 +1426,34 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
 	    set objfile "tmpdir/$fileroot.o"
 	    lappend objfiles $objfile
 
-	    # We ignore warnings since some compilers may generate
-	    # incorrect section attributes and the assembler will warn
-	    # them.
 	    if { [ string match "c++" $lang ] } {
-		ld_compile "$CXX -c $CXXFLAGS $cflags" $srcdir/$subdir/$src_file $objfile
+		set cmd "$CXX -c $CXXFLAGS $cflags"
 	    } else {
-		ld_compile "$CC -c $CFLAGS $cflags" $srcdir/$subdir/$src_file $objfile
+		set cmd "$CC -c $CFLAGS $cflags"
 	    }
+	    if ![ld_compile $cmd $srcdir/$subdir/$src_file $objfile] {
+		set failed 1
+		break
+	    }
+	}
+	if { $failed != 0 } {
+	    unresolved $testname
+	    continue
 	}
 
-	# We have to use $CC to build PIE and shared library.
-	if { [ string match "c" $lang ] } {
-	    set link_proc ld_simple_link
-	    set link_cmd $CC
-	} elseif { [ string match "c++" $lang ] } {
-	    set link_proc ld_simple_link
+	if { [ string match "c++" $lang ] } {
+	    set link_proc ld_link
 	    set link_cmd $CXX
-	} elseif { [ string match "-shared" $ld_options ] \
-		   || [ string match "-pie" $ld_options ] } {
-	    set link_proc ld_simple_link
-	    set link_cmd $CC
 	} else {
 	    set link_proc ld_link
-	    set link_cmd $ld
+	    set link_cmd $CC
 	}
 
 	if { $binfile eq "tmpdir/" } {
 	    # compile only
 	    pass $testname
 	    continue;
-	} elseif ![$link_proc $link_cmd $binfile "-L$srcdir/$subdir $ld_options $objfiles"] {
+	} elseif ![$link_proc $link_cmd $binfile "$board_cflags -L$srcdir/$subdir $ld_options $objfiles"] {
 	    set failed 1
 	}
 
@@ -1445,7 +1467,7 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
 	    }
 	}
 
-	if { $failed == 0 } {
+	if { $failed == 0 && [isnative] } {
 	    send_log "Running: $binfile > $binfile.out\n"
 	    verbose "Running: $binfile > $binfile.out"
 	    catch "exec $binfile > $binfile.out" exec_output
@@ -1470,6 +1492,8 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
 
 	if { $failed != 0 } {
 	    fail $testname
+	} elseif ![isnative] {
+	    unsupported $testname
 	} else {
 	    set errcnt 0
 	    pass $testname
@@ -1486,12 +1510,15 @@ proc run_ld_link_exec_tests { targets_to_xfail ldtests } {
 #  4:action and options.
 #  5:name of output file
 #  6:language (optional)
-#  7:linker warnings (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
@@ -1522,10 +1549,11 @@ proc run_cc_link_tests { ldtests } {
 	set actions [lindex $testitem 4]
 	set binfile tmpdir/[lindex $testitem 5]
 	set lang [lindex $testitem 6]
-	set warnings [lindex $testitem 7]
 	set objfiles {}
 	set is_unresolved 0
 	set failed 0
+	set check_ld(terminal) 0
+	set check_ld(source) ""
 
 	#verbose -log "testname  is $testname"
 	#verbose -log "ldflags   is $ldflags"
@@ -1534,7 +1562,37 @@ proc run_cc_link_tests { ldtests } {
 	#verbose -log "actions   is $actions"
 	#verbose -log "binfile   is $binfile"
 	#verbose -log "lang      is $lang"
-	#verbose -log "warnings  is $warnings"
+
+	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 $src_files {
@@ -1542,14 +1600,19 @@ proc run_cc_link_tests { ldtests } {
 	    set objfile "tmpdir/$fileroot.o"
 	    lappend objfiles $objfile
 
-	    # We ignore warnings since some compilers may generate
-	    # incorrect section attributes and the assembler will warn
-	    # them.
 	    if { [ string match "c++" $lang ] } {
-		ld_compile "$CXX -c $CXXFLAGS $cflags" $srcdir/$subdir/$src_file $objfile
+		set cmd "$CXX -c $CXXFLAGS $cflags"
 	    } else {
-		ld_compile "$CC -c $CFLAGS $cflags" $srcdir/$subdir/$src_file $objfile
+		set cmd "$CC -c $CFLAGS $cflags"
 	    }
+	    if ![ld_compile $cmd $srcdir/$subdir/$src_file $objfile] {
+		set failed 1
+		break
+	    }
+	}
+	if { $failed != 0 } {
+	    unresolved $testname
+	    continue
 	}
 
 	# Clear error and warning counts.
@@ -1565,26 +1628,38 @@ proc run_cc_link_tests { ldtests } {
 	    # compile only
 	} elseif { [regexp ".*\\.a$" $binfile] } {
 	    if { ![ar_simple_create $ar $ldflags $binfile "$objfiles"] } {
-		fail $testname
 		set failed 1
 	    }
 	} else {
-	    if { ![ld_simple_link $cc_cmd $binfile "$board_cflags -L$srcdir/$subdir $ldflags $objfiles"] } {
-		set failed 1
-	    }
+	    ld_link $cc_cmd $binfile "$board_cflags -L$srcdir/$subdir $ldflags $objfiles"
+	    set ld_output "$exec_output"
 
-	    # Check if exec_output is expected.
-	    if { $warnings != "" } then {
-		verbose -log "returned with: <$exec_output>, expected: <$warnings>"
-		if { [regexp $warnings $exec_output] } then {
-		    set failed 0
-		} else {
+	    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 { $failed == 1 } {
-		fail $testname
+	    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
+                }
 	    }
 	}
 
@@ -1604,6 +1679,10 @@ proc run_cc_link_tests { ldtests } {
 		        { set dump_prog $nm }
 		    readelf
 		        { set dump_prog $READELF }
+		    error {}
+		    warning {}
+		    error_output {}
+		    warning_output {}
 		    default
 			{
 			    perror "Unrecognized action $action"
@@ -1646,13 +1725,12 @@ proc run_cc_link_tests { ldtests } {
 	    }
 	}
 
-	if { $failed != 0 } {
+	if { $failed } {
 	    fail $testname
-	} elseif { $is_unresolved == 0 } {
-	    pass $testname
-	} else {
+	} elseif { $is_unresolved } {
 	    unresolved $testname
-	    continue
+	} else {
+	    pass $testname
 	}
     }
 }
@@ -1666,11 +1744,11 @@ 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*-*-*]
+	    || [istarget pru*-*-*]
 	    || [istarget alpha-*-*]
 	    || [istarget hppa*64-*-*]
 	    || [istarget i370-*-*]
@@ -1708,7 +1786,7 @@ 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-*-*]
@@ -1719,8 +1797,8 @@ proc check_shared_lib_support { } {
 	 && ![istarget dlx-*-*]
 	 && ![istarget epiphany-*-*]
 	 && ![istarget fr30-*-*]
-	 && ![istarget ft32-*-*]
 	 && ![istarget frv-*-*]
+	 && ![istarget ft32-*-*]
 	 && ![istarget h8300-*-*]
 	 && ![istarget i860-*-*]
 	 && ![istarget i960-*-*]
@@ -1741,13 +1819,16 @@ proc check_shared_lib_support { } {
 	 && ![istarget msp430-*-*]
 	 && ![istarget mt-*-*]
 	 && ![istarget nds32*-*-*]
+	 && ![istarget nios2-*-elf]
 	 && ![istarget or1k*-*-*]
 	 && ![istarget pj-*-*]
+	 && ![istarget pru-*-*]
 	 && ![istarget rl78-*-*]
 	 && ![istarget rx-*-*]
 	 && ![istarget spu-*-*]
 	 && ![istarget v850*-*-*]
 	 && ![istarget visium-*-*]
+	 && ![istarget xc16x-*-elf]
 	 && ![istarget xgate-*-*]
 	 && ![istarget xstormy16-*-*]
 	 && ![istarget *-*-irix*]
@@ -1757,6 +1838,26 @@ proc check_shared_lib_support { } {
     return 0
 }
 
+# Return true if target uses genelf.em (assuming it is ELF).
+proc is_generic_elf { } {
+    if { [istarget "d30v-*-*"]
+	 || [istarget "dlx-*-*"]
+	 || [istarget "fr30-*-*"]
+	 || ([istarget "frv-*-*"] && ![istarget "frv-*-linux*"])
+	 || [istarget "ft32-*-*"]
+	 || [istarget "i860-*-*"]
+	 || [istarget "i960-*-*"]
+	 || [istarget "iq2000-*-*"]
+	 || [istarget "mn10200-*-*"]
+	 || [istarget "moxie-*-*"]
+	 || [istarget "msp430-*-*"]
+	 || [istarget "mt-*-*"]
+	 || [istarget "pj*-*-*"] } {
+	return 1;
+    }
+    return 0;
+}
+
 # Returns true if the target ld supports the plugin API.
 proc check_plugin_api_available { } {
     global plugin_api_available_saved
@@ -1789,13 +1890,38 @@ 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
 	}
@@ -1838,7 +1964,7 @@ 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
 	}
@@ -1881,7 +2007,7 @@ 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
 	}
@@ -2049,3 +2175,38 @@ proc istarget { target } {
     }
     return [istarget_ld $target]
 }
+
+# Return true if libdl is supported.
+
+proc check_libdl_available { } {
+    global libdl_available_saved
+    global CC
+
+    if {![info exists libdl_available_saved]} {
+        if { [which $CC] == 0 } {
+	    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" "$src -o $output -ldl"]
+	remote_file host delete $src
+	remote_file host delete $output
+	file delete $src
+    }
+    return $libdl_available_saved
+}