MIPS: Support `-gnuabi64' target triplet suffix for 64-bit Linux targets

Make the n64 ABI the default for 64-bit Linux targets specified with
`-gnuabi64' suffix included in the target triplet, for configurations
such as the Debian mips64el and mips64r6el ports.  Adjust testsuite
configuration accordingly.

There are the following regressions with the new target triplet:

mips64-linux-gnuabi64  +FAIL: readelf -S bintest
mips64-linux-gnuabi64  +FAIL: MIPS reloc estimation 1
mips64el-linux-gnuabi64  +FAIL: readelf -S bintest
mips64el-linux-gnuabi64  +FAIL: MIPS reloc estimation 1

The `readelf' issue comes from a difference in section headers produced
that the `binutils/testsuite/binutils-all/readelf.s-64' pattern template
does not match.  While there has been a precedent it does not appear to
me that there is a clear advantage from adding more and more variations
to the template rather than forking the existing template into multiple
ones for a more exact match.  So this is best deferred to a separate
discussion.

The MIPS reloc estimation issue is an actual bug in `objdump', which
discards a number of trailing entries from output here for n64 composed
relocations:

DYNAMIC RELOCATION RECORDS
OFFSET           TYPE              VALUE
0000000000000000 R_MIPS_NONE       *ABS*
0000000000000000 R_MIPS_NONE       *ABS*

and consequently `ld/testsuite/ld-mips-elf/reloc-estimate-1.d' does not
match even though ELF output produced is correct according to `readelf':

Relocation section '.rel.dyn' at offset 0x10400 contains 2 entries:
  Offset          Info           Type           Sym. Value    Sym. Name
000000000000  000000000000 R_MIPS_NONE
                    Type2: R_MIPS_NONE
                    Type3: R_MIPS_NONE
000000010000  000300001203 R_MIPS_REL32      0000000000010010 foo@@V2
                    Type2: R_MIPS_64
                    Type3: R_MIPS_NONE

As a genuine bug this has to be handled separately.

Co-Authored by: Maciej W. Rozycki <macro@orcam.me.uk>

	bfd/
	* config.bfd: Add `mips64*el-*-linux*-gnuabi64' and
	`mips64*-*-linux*-gnuabi64' targets.

	binutils/
	* testsuite/binutils-all/mips/mips.exp: Handle `*-*-*-gnuabi64'
	targets.
	* testsuite/binutils-all/objcopy.exp: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/binutils-all/remove-relocs-01.d: Likewise.
	* testsuite/binutils-all/remove-relocs-04.d: Likewise.
	* testsuite/binutils-all/remove-relocs-05.d: Likewise.
	* testsuite/binutils-all/remove-relocs-06.d: Likewise.

	gas/
	* configure.ac: Handle `mips64*-linux-gnuabi64' targets.
	* configure: Regenerate.
	* testsuite/gas/mips/compact-eh-eb-7.d: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/gas/mips/compact-eh-el-7.d: Likewise.

	ld/
	* configure.tgt: Add `mips64*el-*-linux-gnuabi64' and
	`mips64*-*-linux-gnuabi64' targets.
	* testsuite/ld-undefined/undefined.exp: Handle
	`mips64*-*-*-gnuabi64' targets.
	* testsuite/ld-mips-elf/attr-gnu-4-10.d: Likewise.
	* testsuite/ld-mips-elf/compact-eh6.d: Likewise.
	* testsuite/ld-mips-elf/mips-elf.exp: Handle `*-*-*-gnuabi64'
	targets.

1 files changed, 10 insertions, 0 deletions

diff --git a/bfd/config.bfd b/bfd/config.bfd
index 54a30ef..3b39ff3 100644
--- a/bfd/config.bfd
+++ b/bfd/config.bfd
@@ -941,10 +941,20 @@ case "${targ}" in
     targ_defvec=mips_elf32_be_vec
     targ_selvecs="mips_elf32_le_vec mips_elf64_be_vec mips_elf64_le_vec mips_ecoff_be_vec mips_ecoff_le_vec"
     ;;
+  mips64*el-*-linux*-gnuabi64)
+    targ_defvec=mips_elf64_trad_le_vec
+    targ_selvecs="mips_elf64_trad_be_vec mips_elf32_ntrad_le_vec mips_elf32_ntrad_be_vec mips_elf32_trad_le_vec mips_elf32_trad_be_vec"
+    want64=true
+    ;;
   mips64*el-*-linux*)
     targ_defvec=mips_elf32_ntrad_le_vec
     targ_selvecs="mips_elf32_ntrad_be_vec mips_elf32_trad_le_vec mips_elf32_trad_be_vec mips_elf64_trad_le_vec mips_elf64_trad_be_vec"
     ;;
+  mips64*-*-linux*-gnuabi64)
+    targ_defvec=mips_elf64_trad_be_vec
+    targ_selvecs="mips_elf64_trad_le_vec mips_elf32_ntrad_be_vec mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec"
+    want64=true
+    ;;
   mips64*-*-linux*)
     targ_defvec=mips_elf32_ntrad_be_vec
     targ_selvecs="mips_elf32_ntrad_le_vec mips_elf32_trad_be_vec mips_elf32_trad_le_vec mips_elf64_trad_be_vec mips_elf64_trad_le_vec"