RISC-V: Move STARTFILE_PREFIX_SPEC into target OS files.

	gcc/
	PR target/89955
	* config/riscv/riscv.h (STARTFILE_PREFIX_SPEC): Deleted.
	* config/riscv/freebsd.h (STARTFILE_PREFIX_SPEC): Added.
	* config/riscv/linux.h (STARTFILE_PREFIX_SPEC): Added.

From-SVN: r272021

gcc/ChangeLog

+2019-06-06  Jim Wilson  <jimw@sifive.com>
+
+	PR target/89955
+	* config/riscv/riscv.h (STARTFILE_PREFIX_SPEC): Deleted.
+	* config/riscv/freebsd.h (STARTFILE_PREFIX_SPEC): Added.
+	* config/riscv/linux.h (STARTFILE_PREFIX_SPEC): Added.
+
 2019-06-06  Martin Sebor  <msebor@redhat.com>
 
 	* tree-ssa-strlen.c (adjust_related_strinfos): Avoid trailing article.

gcc/config/riscv/freebsd.h

@@ -52,3 +52,9 @@ along with GCC; see the file COPYING3.  If not see
         %{rdynamic:-export-dynamic}				\
         -dynamic-linker " FBSD_DYNAMIC_LINKER "}		\
         %{static:-static}}"
+
+#define STARTFILE_PREFIX_SPEC 			\
+   "/lib" XLEN_SPEC "/" ABI_SPEC "/ "		\
+   "/usr/lib" XLEN_SPEC "/" ABI_SPEC "/ "	\
+   "/lib/ "					\
+   "/usr/lib/ "

gcc/config/riscv/linux.h

@@ -68,3 +68,9 @@ along with GCC; see the file COPYING3.  If not see
     %{static:-static}}"
 
 #define TARGET_ASM_FILE_END file_end_indicate_exec_stack
+
+#define STARTFILE_PREFIX_SPEC 			\
+   "/lib" XLEN_SPEC "/" ABI_SPEC "/ "		\
+   "/usr/lib" XLEN_SPEC "/" ABI_SPEC "/ "	\
+   "/lib/ "					\
+   "/usr/lib/ "

gcc/config/riscv/riscv.h

@@ -893,12 +893,6 @@ extern unsigned riscv_stack_boundary;
   "%{mabi=lp64f:lp64f}" \
   "%{mabi=lp64d:lp64d}" \
 
-#define STARTFILE_PREFIX_SPEC 			\
-   "/lib" XLEN_SPEC "/" ABI_SPEC "/ "		\
-   "/usr/lib" XLEN_SPEC "/" ABI_SPEC "/ "	\
-   "/lib/ "					\
-   "/usr/lib/ "
-
 /* ISA constants needed for code generation.  */
 #define OPCODE_LW    0x2003
 #define OPCODE_LD    0x3003