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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: cisco.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY5PR11MB4244.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e1a11fc0-0566-4d57-9352-08de01e45b18 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Oct 2025 18:49:02.5532 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5ae1af62-9505-4097-a69a-c1553ef7840e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: F3KngybktybIA9MqLH3Gep9dc72rCoZt/chSaSrYQCEGiuO5bQsCdEVMpKKArFj0ksQMhzU2JCkympZbLuuRMg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB7722 X-Outbound-SMTP-Client: 72.163.7.169, rcdn-opgw-5.cisco.com X-Outbound-Node: alln-l-core-07.cisco.com X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: "Billie Alsup \(balsup\) via Gdb" Reply-To: "Billie Alsup \(balsup\)" Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" I have a similar problem with other functions. =A0I discovered that the lin= ker --wrap option no longer wraps what I was expecting. =A0For example, wra= pping strtoul stopped working with a new glibc, as what was really being in= voked was _isoc23_strtoul (and apparently the linker never sees the symbol = strtoul). =A0 I think it is related =A0to the use of asm in the REDIRECT ma= cros for such functions, which I'm guessing is similar to how printf is bei= ng redirected in this thread.=0A= =0A= =0A= extern unsigned long int=A0__REDIRECT_NTH (strtoul,=0A= =A0=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 (const char=A0*__restrict __nptr,=0A= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 char=A0**__restrict __endptr,=0A= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 int=A0__base), __isoc23_strtoul)=0A= =A0=A0 =A0 __nonnull ((1));=0A= =0A= =0A= =0A= ________________________________________=0A= From:=A0Libc-help on = behalf of Peter Bergner via Libc-help =0A= Sent:=A0Thursday, October 2, 2025 11:12 AM=0A= To:=A0Florian Weimer ; Peter Bergner via Libc-help =0A= Cc:=A0Michael Meissner ; Carl Love ; libc-alpha@sourceware.org ; Segher Boessenk= ool ; gdb@sourceware.org ; = Surya Kumari Jangala =0A= Subject:=A0Re: [EXT] Re: gdb does not stop at printf for ppc=0A= =A0=0A= On 10/2/25 11:58 AM, Florian Weimer wrote:=0A= > * Peter Bergner via Libc-help:=0A= >=0A= >> Ok, it's an even bigger problem than we thought.=A0 I'm surprised no one= =0A= >> else has hit this before us.=0A= >=0A= > We've encountered it with fortification and IFUNC resolvers.=A0 It used t= o=0A= > be considered a user error.=0A= =0A= Yeah, I don't think we can consider this a user error, since the user=0A= called printf() and so should validly expect that "break printf" in gdb=0A= should work.=A0 It was only the shifty compiler that silently replaced=0A= printf with __printfieee128 that broke everything! :-)=0A= =0A= =0A= =0A= >> Ok, this is promising and yeah, is what Carl and Uli suggested.=0A= >> That said, their comment from the bugzilla:=0A= >>=0A= >>=A0=A0=A0=A0 The new redirected symbols need to be dynamic symbols in cas= e only=0A= >>=A0=A0=A0=A0 the stripped binary is available.=0A= >=0A= > I'd recommend distributions do not strip .symtab on libc.so.6.=A0 I don't= =0A= > think making this a dynamic symbol is worth it.=A0 It would have to be a= =0A= > compatibility symbol under a separate symbol version, one for each=0A= > variant alias (eight for POWER?).=A0 This is quite a bit of complexity.= =0A= =0A= I'd be fine with that, if that is what everyone else thinks is best.=0A= Worst case, a distro strips libc.so.6 and we're just back with the=0A= current state of behavior.=A0 Do we know what Debian/Ubuntu and Gentoo=0A= do wrt strpping or not stripping libc.so.6?=0A= =0A= I definitely don't like the idea of all of those compatibility symbols!=0A= =0A= =0A= Peter=0A= =0A=