Fix linker detection in check_gc_sections_available

	* lib/target-supports.exp (check_gc_sections_available): Use
	-print-prog-name=ld to determine linker used.

From-SVN: r241783

gcc/testsuite/ChangeLog

+2016-11-02  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* lib/target-supports.exp (check_gc_sections_available): Use
+	-print-prog-name=ld to determine linker used.
+
 2016-11-02  Martin Liska  <mliska@suse.cz>
 
 	* gcc.dg/tree-ssa/builtins-folding-gimple-ub.c (main): Add

gcc/testsuite/lib/target-supports.exp

@@ -462,9 +462,7 @@ proc check_gc_sections_available { } {
 	}
 
 	# Check if the ld used by gcc supports --gc-sections.
-	set gcc_spec [${tool}_target_compile "-dumpspecs" "" "none" ""]
-	regsub ".*\n\\*linker:\[ \t\]*\n(\[^ \t\n\]*).*" "$gcc_spec" {\1} linker
-	set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=$linker" "" "none" ""] 0]
+	set gcc_ld [lindex [${tool}_target_compile "-print-prog-name=ld" "" "none" ""] 0]
 	set ld_output [remote_exec host "$gcc_ld" "--help"]
 	if { [ string first "--gc-sections" $ld_output ] >= 0 } {
 	    set gc_sections_available_saved 1