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[GCC PR55056] Re: [RFC patch] testsuite: Workaround issues with GCC 4.8.0pre + gdb.trace new KFAIL

From: Thomas Schwinge <thomas at codesourcery dot com>
To: Jan Kratochvil <jan dot kratochvil at redhat dot com>, <gdb-patches at sourceware dot org>, <gcc at gcc dot gnu dot org>
Date: Fri, 14 Jun 2013 15:02:47 +0200
Subject: [GCC PR55056] Re: [RFC patch] testsuite: Workaround issues with GCC 4.8.0pre + gdb.trace new KFAIL
References: <20130126202645 dot GA4888 at host2 dot jankratochvil dot net> <5106D7E1 dot 1060705 at codesourcery dot com> <20130129174955 dot GA17823 at host2 dot jankratochvil dot net> <20130202092240 dot GA24458 at host2 dot jankratochvil dot net> <20130203172721 dot GA8611 at host2 dot jankratochvil dot net>
Hi!

To highlight this issue again, <http://gcc.gnu.org/PR55056>, now that
Debian testing has switched to GCC 4.8:

On Sun, 3 Feb 2013 18:27:21 +0100, Jan Kratochvil <jan.kratochvil@redhat.com> wrote:
> gdb/testsuite/
> 2013-02-02  Jan Kratochvil  <jan.kratochvil@redhat.com>
> 
> 	Workaround GCC PR debug/55056 and GDB PR server/15081.
> 	* gdb.base/restore.c (caller3): Protect l1 by GCC_PR_55056 #ifdef.
> 	(caller4): Protect l1 and l2 by GCC_PR_55056 #ifdef.
> 	(caller5): Protect l1, l2 and l3 by GCC_PR_55056 #ifdef.
> 	* gdb.base/restore.exp: New variable opts.  Test caller3, caller4 and
> 	caller5 for l1, l2 and l3.  New prepare_for_testing.
> 	* gdb.base/store.c (wack_longest, wack_float, wack_double)
> 	(wack_doublest): Protect l and r by GCC_PR_55056 #ifdef.
> 	* gdb.base/store.exp: New variable opts.  Test longest, float, double
> 	and doublest functions for l and r.  New prepare_for_testing.
> 	* gdb.trace/collection.c (reglocal_test_func): Protect locf and locd by
> 	GCC_PR_55056 #ifdef.  Protect locar by GDB_PR_15081 #ifdef.
> 	* gdb.trace/unavailable.c: Likewise.
> 	* gdb.trace/collection.exp: New variable opts.  Test reglocal_test_func
> 	for locf, locd and locar.  New prepare_for_testing.
> 	(gdb_collect_locals_test): Increase list size to 43.
> 	* gdb.trace/unavailable.exp: Likewise.

As far as I can tell, no consensus has yet been reached about the
approach to fix this issue discussed in this thread.  (I have not looked
at the proposed patch in detail.)

I had already been configuring my native GDB builds with CC=gcc-4.8
CXX=g++-4.8, and naively assumed the same compiler as specified on the
configure command-line would be used for the GDB testsuite -- which is
not true, as it now turns out.  Is this to be considered a bug in the GDB
build/test harness?

Anyway, upon Debian testing/unstable just switching the default system
compiler from 4.7 to 4.8, the following new FAILs appear in my native x86
GNU/Linux and GNU/Hurd testing:

    --- [...]/gdb.base2/gdb.sum
    +++ [...]/gdb.base2/gdb.sum
    @@ -1395,31 +1395,31 @@ PASS: gdb.base/restore.exp: run to caller3
     PASS: gdb.base/restore.exp: caller3 calls callee1; tbreak callee
     PASS: gdb.base/restore.exp: caller3 calls callee1; continue to callee
     PASS: gdb.base/restore.exp: caller3 calls callee1; return callee now
    -PASS: gdb.base/restore.exp: caller3 calls callee1; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller3 calls callee1; return restored l1 to 32492
     PASS: gdb.base/restore.exp: caller3 calls callee1; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller3 calls callee1; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller3 calls callee2; tbreak callee
     PASS: gdb.base/restore.exp: caller3 calls callee2; continue to callee
     PASS: gdb.base/restore.exp: caller3 calls callee2; return callee now
    -PASS: gdb.base/restore.exp: caller3 calls callee2; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller3 calls callee2; return restored l1 to 32492
     PASS: gdb.base/restore.exp: caller3 calls callee2; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller3 calls callee2; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller3 calls callee3; tbreak callee
     PASS: gdb.base/restore.exp: caller3 calls callee3; continue to callee
     PASS: gdb.base/restore.exp: caller3 calls callee3; return callee now
    -PASS: gdb.base/restore.exp: caller3 calls callee3; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller3 calls callee3; return restored l1 to 32492
     PASS: gdb.base/restore.exp: caller3 calls callee3; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller3 calls callee3; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller3 calls callee4; tbreak callee
     PASS: gdb.base/restore.exp: caller3 calls callee4; continue to callee
     PASS: gdb.base/restore.exp: caller3 calls callee4; return callee now
    -PASS: gdb.base/restore.exp: caller3 calls callee4; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller3 calls callee4; return restored l1 to 32492
     PASS: gdb.base/restore.exp: caller3 calls callee4; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller3 calls callee4; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller3 calls callee5; tbreak callee
     PASS: gdb.base/restore.exp: caller3 calls callee5; continue to callee
     PASS: gdb.base/restore.exp: caller3 calls callee5; return callee now
    -PASS: gdb.base/restore.exp: caller3 calls callee5; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller3 calls callee5; return restored l1 to 32492
     PASS: gdb.base/restore.exp: caller3 calls callee5; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller3 calls callee5; return restored l3 to 32494
     PASS: gdb.base/restore.exp: tbreak caller4
    @@ -1427,36 +1427,36 @@ PASS: gdb.base/restore.exp: run to caller4
     PASS: gdb.base/restore.exp: caller4 calls callee1; tbreak callee
     PASS: gdb.base/restore.exp: caller4 calls callee1; continue to callee
     PASS: gdb.base/restore.exp: caller4 calls callee1; return callee now
    -PASS: gdb.base/restore.exp: caller4 calls callee1; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller4 calls callee1; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller4 calls callee1; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller4 calls callee1; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller4 calls callee1; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller4 calls callee1; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller4 calls callee2; tbreak callee
     PASS: gdb.base/restore.exp: caller4 calls callee2; continue to callee
     PASS: gdb.base/restore.exp: caller4 calls callee2; return callee now
    -PASS: gdb.base/restore.exp: caller4 calls callee2; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller4 calls callee2; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller4 calls callee2; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller4 calls callee2; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller4 calls callee2; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller4 calls callee2; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller4 calls callee3; tbreak callee
     PASS: gdb.base/restore.exp: caller4 calls callee3; continue to callee
     PASS: gdb.base/restore.exp: caller4 calls callee3; return callee now
    -PASS: gdb.base/restore.exp: caller4 calls callee3; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller4 calls callee3; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller4 calls callee3; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller4 calls callee3; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller4 calls callee3; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller4 calls callee3; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller4 calls callee4; tbreak callee
     PASS: gdb.base/restore.exp: caller4 calls callee4; continue to callee
     PASS: gdb.base/restore.exp: caller4 calls callee4; return callee now
    -PASS: gdb.base/restore.exp: caller4 calls callee4; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller4 calls callee4; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller4 calls callee4; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller4 calls callee4; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller4 calls callee4; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller4 calls callee4; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller4 calls callee5; tbreak callee
     PASS: gdb.base/restore.exp: caller4 calls callee5; continue to callee
     PASS: gdb.base/restore.exp: caller4 calls callee5; return callee now
    -PASS: gdb.base/restore.exp: caller4 calls callee5; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller4 calls callee5; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller4 calls callee5; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller4 calls callee5; return restored l2 to 32493
     PASS: gdb.base/restore.exp: caller4 calls callee5; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller4 calls callee5; return restored l4 to 32495
     PASS: gdb.base/restore.exp: tbreak caller5
    @@ -1464,41 +1464,41 @@ PASS: gdb.base/restore.exp: run to caller5
     PASS: gdb.base/restore.exp: caller5 calls callee1; tbreak callee
     PASS: gdb.base/restore.exp: caller5 calls callee1; continue to callee
     PASS: gdb.base/restore.exp: caller5 calls callee1; return callee now
    -PASS: gdb.base/restore.exp: caller5 calls callee1; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller5 calls callee1; return restored l2 to 32493
    -PASS: gdb.base/restore.exp: caller5 calls callee1; return restored l3 to 32494
    +FAIL: gdb.base/restore.exp: caller5 calls callee1; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller5 calls callee1; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller5 calls callee1; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller5 calls callee1; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller5 calls callee1; return restored l5 to 32496
     PASS: gdb.base/restore.exp: caller5 calls callee2; tbreak callee
     PASS: gdb.base/restore.exp: caller5 calls callee2; continue to callee
     PASS: gdb.base/restore.exp: caller5 calls callee2; return callee now
    -PASS: gdb.base/restore.exp: caller5 calls callee2; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller5 calls callee2; return restored l2 to 32493
    -PASS: gdb.base/restore.exp: caller5 calls callee2; return restored l3 to 32494
    +FAIL: gdb.base/restore.exp: caller5 calls callee2; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller5 calls callee2; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller5 calls callee2; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller5 calls callee2; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller5 calls callee2; return restored l5 to 32496
     PASS: gdb.base/restore.exp: caller5 calls callee3; tbreak callee
     PASS: gdb.base/restore.exp: caller5 calls callee3; continue to callee
     PASS: gdb.base/restore.exp: caller5 calls callee3; return callee now
    -PASS: gdb.base/restore.exp: caller5 calls callee3; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller5 calls callee3; return restored l2 to 32493
    -PASS: gdb.base/restore.exp: caller5 calls callee3; return restored l3 to 32494
    +FAIL: gdb.base/restore.exp: caller5 calls callee3; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller5 calls callee3; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller5 calls callee3; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller5 calls callee3; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller5 calls callee3; return restored l5 to 32496
     PASS: gdb.base/restore.exp: caller5 calls callee4; tbreak callee
     PASS: gdb.base/restore.exp: caller5 calls callee4; continue to callee
     PASS: gdb.base/restore.exp: caller5 calls callee4; return callee now
    -PASS: gdb.base/restore.exp: caller5 calls callee4; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller5 calls callee4; return restored l2 to 32493
    -PASS: gdb.base/restore.exp: caller5 calls callee4; return restored l3 to 32494
    +FAIL: gdb.base/restore.exp: caller5 calls callee4; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller5 calls callee4; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller5 calls callee4; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller5 calls callee4; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller5 calls callee4; return restored l5 to 32496
     PASS: gdb.base/restore.exp: caller5 calls callee5; tbreak callee
     PASS: gdb.base/restore.exp: caller5 calls callee5; continue to callee
     PASS: gdb.base/restore.exp: caller5 calls callee5; return callee now
    -PASS: gdb.base/restore.exp: caller5 calls callee5; return restored l1 to 32492
    -PASS: gdb.base/restore.exp: caller5 calls callee5; return restored l2 to 32493
    -PASS: gdb.base/restore.exp: caller5 calls callee5; return restored l3 to 32494
    +FAIL: gdb.base/restore.exp: caller5 calls callee5; return restored l1 to 32492
    +FAIL: gdb.base/restore.exp: caller5 calls callee5; return restored l2 to 32493
    +FAIL: gdb.base/restore.exp: caller5 calls callee5; return restored l3 to 32494
     PASS: gdb.base/restore.exp: caller5 calls callee5; return restored l4 to 32495
     PASS: gdb.base/restore.exp: caller5 calls callee5; return restored l5 to 32496
     PASS: gdb.base/restore.exp: run to completion
    @@ -2170,35 +2170,35 @@ PASS: gdb.base/store.exp: var long l; print incremented l, expecting 2
     PASS: gdb.base/store.exp: tbreak wack_longest
     PASS: gdb.base/store.exp: continue to wack_longest
     PASS: gdb.base/store.exp: var longest l; print old l, expecting -1
    -PASS: gdb.base/store.exp: var longest l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: var longest l; print old r, expecting -2
     PASS: gdb.base/store.exp: var longest l; setting l to 4
     PASS: gdb.base/store.exp: var longest l; print new l, expecting 4
     PASS: gdb.base/store.exp: var longest l; next over add call
     PASS: gdb.base/store.exp: var longest l; print incremented l, expecting 2
     PASS: gdb.base/store.exp: tbreak wack_float
     PASS: gdb.base/store.exp: continue to wack_float
    -PASS: gdb.base/store.exp: var float l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: var float l; print old l, expecting -1
     PASS: gdb.base/store.exp: var float l; print old r, expecting -2
    -PASS: gdb.base/store.exp: var float l; setting l to 4
    -PASS: gdb.base/store.exp: var float l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: var float l; setting l to 4
    +FAIL: gdb.base/store.exp: var float l; print new l, expecting 4
     PASS: gdb.base/store.exp: var float l; next over add call
    -PASS: gdb.base/store.exp: var float l; print incremented l, expecting 2
    +FAIL: gdb.base/store.exp: var float l; print incremented l, expecting 2
     PASS: gdb.base/store.exp: tbreak wack_double
     PASS: gdb.base/store.exp: continue to wack_double
    -PASS: gdb.base/store.exp: var double l; print old l, expecting -1
    -PASS: gdb.base/store.exp: var double l; print old r, expecting -2
    -PASS: gdb.base/store.exp: var double l; setting l to 4
    -PASS: gdb.base/store.exp: var double l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: var double l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: var double l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: var double l; setting l to 4
    +FAIL: gdb.base/store.exp: var double l; print new l, expecting 4
     PASS: gdb.base/store.exp: var double l; next over add call
    -PASS: gdb.base/store.exp: var double l; print incremented l, expecting 2
    +FAIL: gdb.base/store.exp: var double l; print incremented l, expecting 2
     PASS: gdb.base/store.exp: tbreak wack_doublest
     PASS: gdb.base/store.exp: continue to wack_doublest
    -PASS: gdb.base/store.exp: var doublest l; print old l, expecting -1
    -PASS: gdb.base/store.exp: var doublest l; print old r, expecting -2
    -PASS: gdb.base/store.exp: var doublest l; setting l to 4
    -PASS: gdb.base/store.exp: var doublest l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: var doublest l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: var doublest l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: var doublest l; setting l to 4
    +FAIL: gdb.base/store.exp: var doublest l; print new l, expecting 4
     PASS: gdb.base/store.exp: var doublest l; next over add call
    -PASS: gdb.base/store.exp: var doublest l; print incremented l, expecting 2
    +FAIL: gdb.base/store.exp: var doublest l; print incremented l, expecting 2
     PASS: gdb.base/store.exp: tbreak add_charest
     PASS: gdb.base/store.exp: continue to add_charest
     PASS: gdb.base/store.exp: upvar charest l; up
    @@ -2231,30 +2231,30 @@ PASS: gdb.base/store.exp: tbreak add_longest
     PASS: gdb.base/store.exp: continue to add_longest
     PASS: gdb.base/store.exp: upvar longest l; up
     PASS: gdb.base/store.exp: upvar longest l; print old l, expecting -1
    -PASS: gdb.base/store.exp: upvar longest l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: upvar longest l; print old r, expecting -2
     PASS: gdb.base/store.exp: upvar longest l; set l to 4
     PASS: gdb.base/store.exp: upvar longest l; print new l, expecting 4
     PASS: gdb.base/store.exp: tbreak add_float
     PASS: gdb.base/store.exp: continue to add_float
     PASS: gdb.base/store.exp: upvar float l; up
    -PASS: gdb.base/store.exp: upvar float l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: upvar float l; print old l, expecting -1
     PASS: gdb.base/store.exp: upvar float l; print old r, expecting -2
    -PASS: gdb.base/store.exp: upvar float l; set l to 4
    -PASS: gdb.base/store.exp: upvar float l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: upvar float l; set l to 4
    +FAIL: gdb.base/store.exp: upvar float l; print new l, expecting 4
     PASS: gdb.base/store.exp: tbreak add_double
     PASS: gdb.base/store.exp: continue to add_double
     PASS: gdb.base/store.exp: upvar double l; up
    -PASS: gdb.base/store.exp: upvar double l; print old l, expecting -1
    -PASS: gdb.base/store.exp: upvar double l; print old r, expecting -2
    -PASS: gdb.base/store.exp: upvar double l; set l to 4
    -PASS: gdb.base/store.exp: upvar double l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: upvar double l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: upvar double l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: upvar double l; set l to 4
    +FAIL: gdb.base/store.exp: upvar double l; print new l, expecting 4
     PASS: gdb.base/store.exp: tbreak add_doublest
     PASS: gdb.base/store.exp: continue to add_doublest
     PASS: gdb.base/store.exp: upvar doublest l; up
    -PASS: gdb.base/store.exp: upvar doublest l; print old l, expecting -1
    -PASS: gdb.base/store.exp: upvar doublest l; print old r, expecting -2
    -PASS: gdb.base/store.exp: upvar doublest l; set l to 4
    -PASS: gdb.base/store.exp: upvar doublest l; print new l, expecting 4
    +FAIL: gdb.base/store.exp: upvar doublest l; print old l, expecting -1
    +FAIL: gdb.base/store.exp: upvar doublest l; print old r, expecting -2
    +FAIL: gdb.base/store.exp: upvar doublest l; set l to 4
    +FAIL: gdb.base/store.exp: upvar doublest l; print new l, expecting 4
     PASS: gdb.base/store.exp: tbreak wack_struct_1
     PASS: gdb.base/store.exp: continue to wack_struct_1
     PASS: gdb.base/store.exp: var struct 1 u; next to add_struct_1 call


GrÃÃe,
 Thomas
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Follow-Ups:
- Re: [GCC PR55056] Re: [RFC patch] testsuite: Workaround issues with GCC 4.8.0pre + gdb.trace new KFAIL
  - From: Jan Kratochvil
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