[rfc] -gdwarf-3 and DW_OP_call_frame_cfa

[Hans-Peter Nilsson]

> Date: Tue, 09 Jun 2009 00:06:20 -0700
> From: Richard Henderson <rth@redhat.com>

> There is one quirk.  Previously we'd accept options like -gdwarf-23
> and take that to mean dwarf2 debugging, verbosity level 3.  Now
> you *must* write this as -gdwarf-2 -g3.

A -gdwarf-21 is currently not the same as -gdwarf-2 -g1, as a
regtest of e.g. r148404 (before your change) together with
<http://gcc.gnu.org/ml/gcc-patches/2009-06/msg00962.html> will
show.  For example just C:

Running /tmp/reg83/gcc/gcc/testsuite/gcc.dg/debug/debug.exp ...
FAIL: gcc.dg/debug/debug-1.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-1.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-1.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-1.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-1.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-2.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-2.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-2.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-2.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-2.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/debug-6.c scan-assembler xyzzy
FAIL: gcc.dg/debug/enum-1.c scan-assembler JTI_MAX
FAIL: gcc.dg/debug/enum-1.c scan-assembler JTI_MAX
FAIL: gcc.dg/debug/enum-1.c scan-assembler JTI_MAX

brgds, H-P