gas/riscv: Produce version 3 DWARF CIE by default

The flag controlling the default DWARF CIE version to produce now
starts with the value -1.  This can be modified with the command line
flag as before, but after command line flag processing, in
md_after_parse_args targets can, if the global still has the value -1,
override this value.  This gives a target specific default.

If a CIE version is not select either by command line flag, or a
target specific default, then some new code in dwarf2_init now select
a global default.  This remains as version 1 to match previous
behaviour.

This RISC-V has a target specific default of version provided, this
make the return column uleb128, which means we can use all DWARF
registers include CSRs.

I chose to switch to version 3 rather than version 4 as this is most
similar to the global default (version 1).  Switching to version 4
adds additional columns to the CIE header.

gas/ChangeLog:

	* as.c (flag_dwarf_cie_version): Change initial value to -1, and
	update comment.
	* config/tc-riscv.c (riscv_after_parse_args): Set
	flag_dwarf_cie_version if it has not already been set.
	* dwarf2dbg.c (dwarf2_init): Initialise flag_dwarf_cie_version if
	needed.
	* testsuite/gas/riscv/default-cie-version.d: New file.
	* testsuite/gas/riscv/default-cie-version.s: New file.

ld/ChangeLog:

	* testsuite/ld-elf/eh5.d: Accept version 3 DWARF CIE.

Change-Id: Ibbfe8f0979fba480bf0a359978b09d2b3055555e

1 files changed, 11 insertions, 0 deletions

diff --git a/gas/dwarf2dbg.c b/gas/dwarf2dbg.c
index 001e2a1..fd6ab54 100644
--- a/gas/dwarf2dbg.c
+++ b/gas/dwarf2dbg.c
@@ -2171,6 +2171,17 @@ void
 dwarf2_init (void)
 {
   last_seg_ptr = &all_segs;
+
+  /* Select the default CIE version to produce here.  The global
+     starts with a value of -1 and will be modified to a valid value
+     either by the user providing a command line option, or some
+     targets will select their own default in md_after_parse_args.  If
+     we get here and the global still contains -1 then it is up to us
+     to pick a sane default.  The default we choose is 1, this is the
+     CIE version gas has produced for a long time, and there seems no
+     reason to change it yet.  */
+  if (flag_dwarf_cie_version == -1)
+    flag_dwarf_cie_version = 1;
 }