Allow a second -T<section>=<addr> to override a previous version on the same linker command line.

	PR ld/20302
	* lexsup.c (set_segment_start): If resetting the start address of
	a section, remember to generate a new script element as well.
	* testsuite/ld-scripts/pr20302.d: New test.
	* testsuite/ld-scripts/scripts.exp: Run the new test.

ld/ChangeLog

+2016-06-27  Nick Clifton  <nickc@redhat.com>
+
+	PR ld/20302
+	* lexsup.c (set_segment_start): If resetting the start address of
+	a section, remember to generate a new script element as well.
+	* testsuite/ld-scripts/pr20302.d: New test.
+	* testsuite/ld-scripts/scripts.exp: Run the new test.
+
 2016-06-24  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-aarch64/aarch64-elf.exp (aarch64_choose_ilp32_emul):

ld/lexsup.c

@@ -1686,6 +1686,7 @@ set_segment_start (const char *section, char *valstr)
     if (strcmp (seg->name, name) == 0)
       {
 	seg->value = val;
+	lang_section_start (section, exp_intop (val), seg);
 	return;
       }
   /* There was no existing value so we must create a new segment

ld/testsuite/ld-scripts/pr20302.d

+#ld: -Tdata=0x1000 -Tdata=0x2000 -Tcross2.t
+#source: align2a.s
+#objdump: -h
+#notarget: rx-*-* *-*-aout *-*-netbsd x86_64-*-cygwin *-*-vms
+# RX uses non standard section names.
+# AOUT and NETBSD  have fixed address for the data section.
+# x86_64 Cygwin biases all start addresses to be > 2Gb.
+# VMS targets need extra libraries.
+
+#...
+  . \.data[ 	]+0+[0-9a-f]+[ 	]+0+02000[ 	]+0+02000.*
+#pass

ld/testsuite/ld-scripts/script.exp

@@ -230,3 +230,4 @@ foreach test_script $test_script_list {
 }
 
 run_dump_test "align-with-input"
+run_dump_test "pr20302"