RISC-V: Raise error on unexpected ISA string at end.

	2019-07-31  Maxim Blinov  <maxim.blinov@embecosm.com>
	gcc/
	* common/config/riscv/riscv-common.c: Check -march string ends
	with null.
	gcc/testsuite/
	* gcc.target/riscv/attribute-10.c: New test.

From-SVN: r273951

gcc/ChangeLog

+2019-07-31  Maxim Blinov  <maxim.blinov@embecosm.com>
+
+	* common/config/riscv/riscv-common.c: Check -march string ends
+	with null.
+
 2019-07-31  Alexander Monakov  <amonakov@ispras.ru>
 
 	* ipa-devirt.c (type_warning_cmp): Make static.

gcc/common/config/riscv/riscv-common.c

@@ -513,6 +513,13 @@ riscv_subset_list::parse (const char *arch, location_t loc)
   if (p == NULL)
     goto fail;
 
+  if (*p != '\0')
+    {
+      error_at (loc, "%<-march=%s%>: unexpected ISA string at end: %qs",
+               arch, p);
+      goto fail;
+    }
+
   return subset_list;
 
 fail:

gcc/testsuite/ChangeLog

+2019-07-31  Maxim Blinov  <maxim.blinov@embecosm.com>
+
+	* gcc.target/riscv/attribute-10.c: New test.
+
 2019-07-31  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/91280

gcc/testsuite/gcc.target/riscv/attribute-10.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -march=rv32im_s_sx_unexpectedstring -mabi=ilp32" } */
+int foo()
+{
+}
+/* { dg-error "unexpected ISA string at end:" "" { target { "riscv*-*-*" } } 0 } */