RISC-V: Pass --no-relax to linker if -mno-relax is present.

	gcc/
	2018-04-20  Kito Cheng  <kito.cheng@gmail.com>
	* config/riscv/elf.h (LINK_SPEC): Pass --no-relax if
	-mno-relax is present.
	* config/riscv/linux.h (LINK_SPEC): Ditto.

From-SVN: r259540

gcc/ChangeLog

+2018-04-20  Kito Cheng  <kito.cheng@gmail.com>
+
+	* config/riscv/elf.h (LINK_SPEC): Pass --no-relax if
+	-mno-relax is present.
+	* config/riscv/linux.h (LINK_SPEC): Ditto.
+
 2018-04-20  Martin Sebor  <msebor@redhat.com>
 
 	PR c/85365

gcc/config/riscv/elf.h

@@ -19,6 +19,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #define LINK_SPEC "\
 -melf" XLEN_SPEC "lriscv \
+%{mno-relax:--no-relax} \
 %{shared}"
 
 /* Link against Newlib libraries, because the ELF backend assumes Newlib.

gcc/config/riscv/linux.h

@@ -51,6 +51,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #define LINK_SPEC "\
 -melf" XLEN_SPEC "lriscv \
+%{mno-relax:--no-relax} \
 %{shared} \
   %{!shared: \
     %{!static: \