[binutils-gdb/binutils-2_42-branch] LoongArch: ld:Report an error when seeing an unrecognized relocation

[liu & zhensong]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=09ba78f051319e8f8861b26fb9340e21ca973c70

commit 09ba78f051319e8f8861b26fb9340e21ca973c70
Author: Lulu Cai <cailulu@loongson.cn>
Date:   Thu Mar 21 15:16:05 2024 +0800

    LoongArch: ld:Report an error when seeing an unrecognized relocation
    
    If we generate an object file using an assembler with the new
    relocations added, and then linking those files with an older
    linker, the link will still complete and the linked file will
    be generated.
    In this case we should report an error instead of continuing
    the linking process.
    
    (cherry picked from commit 5966e2eb3fed61ebe5c091a074b368b9238a68c1)

Diff:
---
 bfd/elfnn-loongarch.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/bfd/elfnn-loongarch.c b/bfd/elfnn-loongarch.c
index dae68911733..a7daea678d0 100644
--- a/bfd/elfnn-loongarch.c
+++ b/bfd/elfnn-loongarch.c
@@ -2688,9 +2688,14 @@ loongarch_elf_relocate_section (bfd *output_bfd, struct bfd_link_info *info,
       bfd_vma relocation, off, ie_off, desc_off;
       int i, j;
 
+      /* When an unrecognized relocation is encountered, which usually
+	 occurs when using a newer assembler but an older linker, an error
+	 should be reported instead of continuing to the next relocation.  */
       howto = loongarch_elf_rtype_to_howto (input_bfd, r_type);
-      if (howto == NULL || r_type == R_LARCH_GNU_VTINHERIT
-	  || r_type == R_LARCH_GNU_VTENTRY)
+      if (howto == NULL)
+	return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
+
+      if (r_type == R_LARCH_GNU_VTINHERIT || r_type == R_LARCH_GNU_VTENTRY)
 	continue;
 
       /* This is a final link.  */