From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 21586 invoked by alias); 4 May 2002 04:10:22 -0000 Mailing-List: contact gdb-patches-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-patches-owner@sources.redhat.com Received: (qmail 21577 invoked from network); 4 May 2002 04:10:20 -0000 Received: from unknown (HELO duracef.shout.net) (204.253.184.12) by sources.redhat.com with SMTP; 4 May 2002 04:10:20 -0000 Received: (from mec@localhost) by duracef.shout.net (8.11.6/8.11.6) id g444AJn08545; Fri, 3 May 2002 23:10:19 -0500 Date: Fri, 03 May 2002 21:10:00 -0000 From: Michael Elizabeth Chastain Message-Id: <200205040410.g444AJn08545@duracef.shout.net> To: drow@mvista.com, jimb@redhat.com Subject: Re: RFA: Check for corruption of cv_type chain Cc: gdb-patches@sources.redhat.com X-SW-Source: 2002-05/txt/msg00100.txt.bz2 Jim Blandy writes: > [goes and checks his compilers] I see what's going on now. In GCC > 2.96, -g doesn't get you `const' and `volatile' qualifiers in stabs > --- that's why I thought -gstabs was the default. But in fact, GCC > 2.96 won't give you those qualifiers no matter how nicely you ask. Yes, you can see that happening here: http://www.shout.net/~mec/sunday/2002-05-01/Attention-gdb-HEAD.html Look at the lines for gdb.base/constvars.exp and gdb.base/volatile.exp. gcc 2.95.3 -gstabs+ and gcc 2.96 -gstabs+ give many XFAIL's for these tests. > The current GCC sources default to Dwarf 2. So except for the > window between the point where we taught dbxout.c to emit the > qualifiers, and the point where we made Dwarf 2 the default (a pretty > narrow window, in terms of installed base, no?), it doesn't matter > whether -gstabs+ is the default or not; this test won't do its job > with the default flags. Two comments. First, gcc 3.0.4 falls into that window, and it is the current released compiler. Indeed, every other gcc released in the past twelve months or so has been a gcc 3.0.X compiler, so it will have the cv qualifiers and have -gstabs+ as default. The window is not narrow at all. Second, the new tests are FAILing with gcc 2.95.3 -gstabs+ and gcc 2.96-rh -gstabs+, the same way they fail with gcc 3.0.4 -gstabs+ and the other gcc 3-series compilers. Let me pop open the logs: # gcc 2.95.3 -gstabs+ (gdb) print var_in_b^M FAIL: gdb.c++/hang.exp: doesn't overwrite struct type (timeout) print var_in_hang3^M FAIL: gdb.c++/hang.exp: doesn't corrupt cv_type chain (timeout) testcase /berman/fsf/_today_/source/gdb/HEAD/src/gdb/testsuite/gdb.c++/hang.exp completed in 125 seconds # gcc 2.96.3 -gstabs+ (gdb) file /berman/fsf/_today_/berman/test/gdb.c++/hang^M Reading symbols from /berman/fsf/_today_/berman/test/gdb.c++/hang...done.^M (gdb) print var_in_b^M FAIL: gdb.c++/hang.exp: doesn't overwrite struct type (timeout) print var_in_hang3^M FAIL: gdb.c++/hang.exp: doesn't corrupt cv_type chain (timeout) testcase /berman/fsf/_today_/source/gdb/HEAD/src/gdb/testsuite/gdb.c++/hang.exp completed in 126 seconds The logs, executable files, and so on, are in the tarballs that I posted. Michael C