Re: Switching x86-64 to GNU2 TLS descriptors

On Tue, Jul 15, 2025 at 3:26 AM H.J. Lu via Gcc wrote: > > On Tue, Jul 15, 2025 at 8:47 AM 'Florian Weimer' via X86-64 System V > Application Binary Interface wrote: > > > > * H. J. Lu: > > > > > Compilers will never know since the build-time glibc is independent of > > > the run-time glibc. If

Re: Switching x86-64 to GNU2 TLS descriptors

* H. J. Lu: > On Tue, Jul 15, 2025 at 8:47 AM 'Florian Weimer' via X86-64 System V > Application Binary Interface wrote: >> >> * H. J. Lu: >> >> > Compilers will never know since the build-time glibc is independent of >> > the run-time glibc. If compilers want to be 100% sure that the run-time

Re: Switching x86-64 to GNU2 TLS descriptors

Florian Weimer writes: > * H. J. Lu: > >> Compilers will never know since the build-time glibc is independent of >> the run-time glibc. If compilers want to be 100% sure that the run-time >> is GNU2 TLS bug-free, they can require linkers which generate the >> GLIBC_ABI_GNU2_TLS dependency. > >

Re: Switching x86-64 to GNU2 TLS descriptors

On Tue, Jul 15, 2025 at 8:47 AM 'Florian Weimer' via X86-64 System V Application Binary Interface wrote: > > * H. J. Lu: > > > Compilers will never know since the build-time glibc is independent of > > the run-time glibc. If compilers want to be 100% sure that the run-time > > is GNU2 TLS bug-fr

Re: Switching x86-64 to GNU2 TLS descriptors

* H. J. Lu: > Compilers will never know since the build-time glibc is independent of > the run-time glibc. If compilers want to be 100% sure that the run-time > is GNU2 TLS bug-free, they can require linkers which generate the > GLIBC_ABI_GNU2_TLS dependency. (Such a linker requirement could be

Re: Switching x86-64 to GNU2 TLS descriptors

On Tue, Jul 15, 2025 at 7:55 AM Florian Weimer wrote: > > * Adhemerval Zanella Netto: > > >> (b) Introduce binary markup to indicate that binaries may need the glibc > >> fix, and that glibc has the fix. > >> > >> [PATCH] x86-64: Add GLIBC_ABI_GNU2_TLS [BZ #33129] > >> > >>

Re: Switching x86-64 to GNU2 TLS descriptors

* Adhemerval Zanella Netto: >> (b) Introduce binary markup to indicate that binaries may need the glibc >> fix, and that glibc has the fix. >> >> [PATCH] x86-64: Add GLIBC_ABI_GNU2_TLS [BZ #33129] >> >> >>

Re: Switching x86-64 to GNU2 TLS descriptors

On 07/07/25 05:37, Florian Weimer via Gcc wrote: > H.J. proposed to switch the default for GCC 16 (turning on > -mtls-dialect=gnu2 by default). This is a bit tricky because when we > tried to make the switch in Fedora (for eventual implementation), we hit > an ABI compatibility problem: > >

Re: Switching x86-64 to GNU2 TLS descriptors

* Richard Biener: > I think both (a) or (d) are reasonable, though I am missing a > configure time flag to override the changed default. Even with > glibc fixed we likely do not want to have this change in older > enterprise code streams given there might be unknown external > tooling that might

Re: Switching x86-64 to GNU2 TLS descriptors

On Mon, Jul 7, 2025 at 10:50 AM Richard Biener wrote: > > On Mon, Jul 7, 2025 at 10:39 AM Florian Weimer via Gcc > wrote: > > > > H.J. proposed to switch the default for GCC 16 (turning on > > -mtls-dialect=gnu2 by default). This is a bit tricky because when we > > tried to make the switch in F

Re: Switching x86-64 to GNU2 TLS descriptors

On Mon, Jul 7, 2025 at 10:39 AM Florian Weimer via Gcc wrote: > > H.J. proposed to switch the default for GCC 16 (turning on > -mtls-dialect=gnu2 by default). This is a bit tricky because when we > tried to make the switch in Fedora (for eventual implementation), we hit > an ABI compatibility pro

Re: Switching x86-64 to GNU2 TLS descriptors

On Mon, Jul 7, 2025 at 4:37 PM Florian Weimer wrote: > > H.J. proposed to switch the default for GCC 16 (turning on > -mtls-dialect=gnu2 by default). This is a bit tricky because when we > tried to make the switch in Fedora (for eventual implementation), we hit > an ABI compatibility problem: > >