RISC-V: Disallow output format changes.

PR 22920
	* emultempl/riscvelf.em (riscv_create_output_section_statements): New.
	(LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): New.
	* testsuite/ld-elf/pr21884.d (#notarget): Add riscv*-*-*.
	* testsuite/ld-unique/pr21529.d (#notarget): Likewise.
	* testsuite/ld-srec/srec.exp (run_srec_test): For riscv*-*-* target,
	call setup_xfail.

ld/ChangeLog

@@ -1,3 +1,13 @@
+2018-03-06  Jim Wilson  <jimw@sifive.com>
+
+	PR 22920
+	* emultempl/riscvelf.em (riscv_create_output_section_statements): New.
+	(LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS): New.
+	* testsuite/ld-elf/pr21884.d (#notarget): Add riscv*-*-*.
+	* testsuite/ld-unique/pr21529.d (#notarget): Likewise.
+	* testsuite/ld-srec/srec.exp (run_srec_test): For riscv*-*-* target,
+	call setup_xfail.
+
 2018-03-03  James Cowgill  <james.cowgill@mips.com>
 	    Maciej W. Rozycki  <macro@mips.com>
 

ld/emultempl/riscvelf.em

@@ -62,7 +62,27 @@ gld${EMULATION_NAME}_after_allocation (void)
   gld${EMULATION_NAME}_map_segments (need_layout);
 }
 
+/* This is a convenient point to tell BFD about target specific flags.
+   After the output has been created, but before inputs are read.  */
+
+static void
+riscv_create_output_section_statements (void)
+{
+  /* See PR 22920 for an example of why this is necessary.  */
+  if (strstr (bfd_get_target (link_info.output_bfd), "riscv") == NULL)
+    {
+      /* The RISC-V backend needs special fields in the output hash structure.
+	 These will only be created if the output format is a RISC-V format,
+	 hence we do not support linking and changing output formats at the
+	 same time.  Use a link followed by objcopy to change output formats.  */
+      einfo (_("%F%P: error: cannot change output format"
+	       " whilst linking %s binaries\n"), "RISC-V");
+      return;
+    }
+}
+
 EOF
 
 LDEMUL_BEFORE_ALLOCATION=riscv_elf_before_allocation
 LDEMUL_AFTER_ALLOCATION=gld${EMULATION_NAME}_after_allocation
+LDEMUL_CREATE_OUTPUT_SECTION_STATEMENTS=riscv_create_output_section_statements

ld/testsuite/ld-elf/pr21884.d

@@ -2,7 +2,7 @@
 #source: pr21884b.s
 #ld: -T pr21884.t
 #objdump: -b binary -s
-#notarget: aarch64*-*-* arm*-*-* avr-*-* hppa-*-* ia64-*-* m68hc1*-*-* nds32*-*-* score-*-* v850-*-*
+#notarget: aarch64*-*-* arm*-*-* avr-*-* hppa-*-* ia64-*-* m68hc1*-*-* nds32*-*-* riscv*-*-* score-*-* v850-*-*
 # Skip targets which can't change output format to binary.
 
 .*:     file format binary

ld/testsuite/ld-srec/srec.exp

@@ -282,6 +282,12 @@ proc run_srec_test { test objs } {
 	setup_xfail "msp430*-*-*"
     }
 
+    # The RISC-V target does not correctly process
+    # relocs when output format is not ELF.
+    if [istarget riscv*-*-*] {
+	setup_xfail "riscv*-*-*"
+    }
+
     # SH64 targets cannot convert format in the linker 
     # using the -oformat command line switch.
     if [istarget sh64*-*-elf] {

ld/testsuite/ld-unique/pr21529.d

@@ -1,6 +1,6 @@
 #ld: --oformat binary -T pr21529.ld -e main
 #objdump: -s -b binary
-#notarget: aarch64*-*-* arm*-*-* avr-*-* ia64-*-* m68hc1*-*-* nds32*-*-* score-*-* v850-*-*
+#notarget: aarch64*-*-* arm*-*-* avr-*-* ia64-*-* m68hc1*-*-* nds32*-*-* riscv*-*-* score-*-* v850-*-*
 # Skip targets which can't change output format to binary.
 
 #pass