RFC: make GNU v3 ABI the default C++ ABI

[Tom Tromey <tromey@redhat.com>]

This patch makes the GNU v3 ABI the default ABI.

This has been the default ABI for g++ since November 2000.
I think it is long past time for gdb to assume this.
Anybody still using the v2 ABI can still set it explicitly.

This doesn't usually matter, due to the hack in minsyms.c, but it can be
seen if you happen to run gdb on a C++ object without any minsyms.

Built and regtested on x86-64 Fedora 16.

Tom

	* gnu-v2-abi.c (_initialize_gnu_v2_abi): Don't set default ABI.
	* gnu-v3-abi.c (_initialize_gnu_v3_abi): Set default ABI.
	* minsyms.c (install_minimal_symbols): Don't check for _Z symbols.
---
 gdb/gnu-v2-abi.c |    1 -
 gdb/gnu-v3-abi.c |    1 +
 gdb/minsyms.c    |   23 -----------------------
 3 files changed, 1 insertions(+), 24 deletions(-)

diff --git a/gdb/gnu-v2-abi.c b/gdb/gnu-v2-abi.c
index 4a600d3..c17955a 100644
--- a/gdb/gnu-v2-abi.c
+++ b/gdb/gnu-v2-abi.c
@@ -423,5 +423,4 @@ _initialize_gnu_v2_abi (void)
 {
   init_gnuv2_ops ();
   register_cp_abi (&gnu_v2_abi_ops);
-  set_cp_abi_as_auto_default (gnu_v2_abi_ops.shortname);
 }
diff --git a/gdb/gnu-v3-abi.c b/gdb/gnu-v3-abi.c
index aef5ae0..641b2b1 100644
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -1134,4 +1134,5 @@ _initialize_gnu_v3_abi (void)
   init_gnuv3_ops ();
 
   register_cp_abi (&gnu_v3_abi_ops);
+  set_cp_abi_as_auto_default (gnu_v3_abi_ops.shortname);
 }
diff --git a/gdb/minsyms.c b/gdb/minsyms.c
index 8a90668..779b9f9 100644
--- a/gdb/minsyms.c
+++ b/gdb/minsyms.c
@@ -1240,29 +1240,6 @@ install_minimal_symbols (struct objfile *objfile)
       objfile->minimal_symbol_count = mcount;
       objfile->msymbols = msymbols;
 
-      /* Try to guess the appropriate C++ ABI by looking at the names 
-	 of the minimal symbols in the table.  */
-      {
-	int i;
-
-	for (i = 0; i < mcount; i++)
-	  {
-	    /* If a symbol's name starts with _Z and was successfully
-	       demangled, then we can assume we've found a GNU v3 symbol.
-	       For now we set the C++ ABI globally; if the user is
-	       mixing ABIs then the user will need to "set cp-abi"
-	       manually.  */
-	    const char *name = SYMBOL_LINKAGE_NAME (&objfile->msymbols[i]);
-
-	    if (name[0] == '_' && name[1] == 'Z'
-		&& SYMBOL_DEMANGLED_NAME (&objfile->msymbols[i]) != NULL)
-	      {
-		set_cp_abi_as_auto_default ("gnu-v3");
-		break;
-	      }
-	  }
-      }
-
       /* Now build the hash tables; we can't do this incrementally
          at an earlier point since we weren't finished with the obstack
 	 yet.  (And if the msymbol obstack gets moved, all the internal
-- 
1.7.7.6