ld: Fix several 32-bit SPARC plugin tests

Several ld plugin tests currently FAIL on 32-bit Solaris/SPARC:

FAIL: load plugin with source
FAIL: plugin claimfile lost symbol with source
FAIL: plugin claimfile replace symbol with source
FAIL: plugin claimfile resolve symbol with source
FAIL: plugin claimfile replace file with source
FAIL: plugin set symbol visibility with source
FAIL: plugin ignore lib with source
FAIL: plugin claimfile replace lib with source
FAIL: plugin 2 with source lib
FAIL: load plugin 2 with source
FAIL: load plugin 2 with source and -r
FAIL: plugin 3 with source lib
FAIL: load plugin 3 with source
FAIL: load plugin 3 with source and -r
FAIL: PR ld/20070

all of them in the same way:

./ld-new: BFD (GNU Binutils) 2.34.50.20200328 internal error, aborting at /vol/src/gnu/binutils/hg/master/git/bfd/elf32-sparc.c:154 in sparc_final_write_processing

This happens when bfd_get_mach returns 0 when abfd refers to a source
file:

$11 = {
  filename = 0x28c358 "/vol/src/gnu/binutils/hg/master/local/ld/testsuite/ld-plugin/func.c (symbol from plugin)", xvec = 0x24ed6c <sparc_elf32_sol2_vec>,
[...]

While I could find no specification what abfd's are allowed/expected in
*_final_write_processing, I could find no other target that behaved the
same.  And indeed ignoring the 0 case fixes the failures.  The code now
errors for other values.  64-bit SPARC is not affected because it doesn't
have a specific implementation of elf_backend_final_write_processing.

Tested on sparc-sun-solaris2.11.

2020-04-07  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
	    Nick Clifton  <nickc@redhat.com>

	* elf32-sparc.c (sparc_final_write_processing): Fix whitespace.
	<0>: Ignore.
	<default>: Error rather than abort.

1 files changed, 19 insertions, 15 deletions

diff --git a/bfd/elf32-sparc.c b/bfd/elf32-sparc.c
index 65c81ec..27fc158 100644
--- a/bfd/elf32-sparc.c
+++ b/bfd/elf32-sparc.c
@@ -121,37 +121,41 @@ sparc_final_write_processing (bfd *abfd)
 {
   switch (bfd_get_mach (abfd))
     {
-    case bfd_mach_sparc :
-    case bfd_mach_sparc_sparclet :
-    case bfd_mach_sparc_sparclite :
+    case bfd_mach_sparc:
+    case bfd_mach_sparc_sparclet:
+    case bfd_mach_sparc_sparclite:
       break; /* nothing to do */
-    case bfd_mach_sparc_v8plus :
+    case bfd_mach_sparc_v8plus:
       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS;
       break;
-    case bfd_mach_sparc_v8plusa :
+    case bfd_mach_sparc_v8plusa:
       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1;
       break;
-    case bfd_mach_sparc_v8plusb :
-    case bfd_mach_sparc_v8plusc :
-    case bfd_mach_sparc_v8plusd :
-    case bfd_mach_sparc_v8pluse :
-    case bfd_mach_sparc_v8plusv :
-    case bfd_mach_sparc_v8plusm :
-    case bfd_mach_sparc_v8plusm8 :
+    case bfd_mach_sparc_v8plusb:
+    case bfd_mach_sparc_v8plusc:
+    case bfd_mach_sparc_v8plusd:
+    case bfd_mach_sparc_v8pluse:
+    case bfd_mach_sparc_v8plusv:
+    case bfd_mach_sparc_v8plusm:
+    case bfd_mach_sparc_v8plusm8:
       elf_elfheader (abfd)->e_machine = EM_SPARC32PLUS;
       elf_elfheader (abfd)->e_flags &=~ EF_SPARC_32PLUS_MASK;
       elf_elfheader (abfd)->e_flags |= EF_SPARC_32PLUS | EF_SPARC_SUN_US1
 				       | EF_SPARC_SUN_US3;
       break;
-    case bfd_mach_sparc_sparclite_le :
+    case bfd_mach_sparc_sparclite_le:
       elf_elfheader (abfd)->e_flags |= EF_SPARC_LEDATA;
       break;
-    default :
-      abort ();
+    case 0: /* A non-sparc architecture - ignore.  */
+      break;
+    default:
+      _bfd_error_handler
+	(_("%pB: unhandled sparc machine value '%lu' detected during write processing"),
+	 abfd, (long) bfd_get_mach (abfd));
       break;
     }
 }