Date: Mon, 2 Feb 2026 12:27:52 -0500 From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: Re: git: f7144a9c4a11 - main - sdt: Use the "cc" operand modifier for the address of probes for GCC 15+ Message-ID: <37283782-ce52-48ec-9d20-6e43606f2919@FreeBSD.org> In-Reply-To: <6980dcc2.2191a.ebc239a@gitrepo.freebsd.org>
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On 2/2/26 12:20, John Baldwin wrote: > The branch main has been updated by jhb: > > URL: https://cgit.FreeBSD.org/src/commit/?id=f7144a9c4a11214a71a3091ce1b232a8243b83ea > > commit f7144a9c4a11214a71a3091ce1b232a8243b83ea > Author: John Baldwin <jhb@FreeBSD.org> > AuthorDate: 2026-02-02 17:19:51 +0000 > Commit: John Baldwin <jhb@FreeBSD.org> > CommitDate: 2026-02-02 17:19:51 +0000 > > sdt: Use the "cc" operand modifier for the address of probes for GCC 15+ > > This is required for GCC on RISC-V. The GCC 15 docs claim that "cc" is > similar to "c" except that it "tries harder". > > NB: I have not yet found a way to make the DTrace probes compile on > RISC-V with older versions of GCC. > > Reviewed by: markj > Differential Revision: https://reviews.freebsd.org/D54964 Once I land an update to the freebsd-gccXX ports to support %#b with printf(9) (in review at https://reviews.freebsd.org/D55016 if any ports person wants to review), RISC-V kernels and worlds can be built with GCC 15. GCC 14 and earlier can't compile SDT probes. :( Also, Someone(tm) should document # support for %b in printf(9). It would also be really great if we could document %r and %y in printf(9) as well. %y prints signed hex values, so printf("%y", -1) is output as "-0x1". %r uses a custom radix defined in a global 'radix' variable (I think this is really only for DDB), and if "+" is passed it assumes the argument is signed rather than unsigned. (This last part is a bit of a hack really. Probably we should use separate letters for signed vs unsigned. Or maybe stop using %r.) -- John Baldwinhome | help
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