Date: Mon, 17 Apr 2017 21:28:07 +0100 From: "Sevan / Venture37" <venture37@gmail.com> To: Ryan Stone <rysto32@gmail.com> Cc: George Neville-Neil <gnn@neville-neil.com>, freebsd-gecko@freebsd.org, Jan Beich <jbeich@freebsd.org>, "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> Subject: Re: DTrace issues? Message-ID: <CA%2BU3Mf4y4yyqdmXiHANniu3eeYF5WMhd8jXMiWGs13Z3a3-=OQ@mail.gmail.com> In-Reply-To: <CAFMmRNwudC_bb_rqus=fqM4tdwVp58fxUByLUmT8Df1J1Pdb7A@mail.gmail.com> References: <3CEE1970-719B-42D1-A95A-FEAD3F375A30@neville-neil.com> <20170212191826.5599A45EA@freefall.freebsd.org> <shlc-anmv-wny@FreeBSD.org> <77416dea-1e9d-4911-b5d0-2ebac227af7e@Spark> <wpam-jesd-wny@FreeBSD.org> <76897620-E958-4AE2-9B6C-062C59526614@neville-neil.com> <CAFMmRNwudC_bb_rqus=fqM4tdwVp58fxUByLUmT8Df1J1Pdb7A@mail.gmail.com>
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On 17 April 2017 at 20:54, Ryan Stone <rysto32@gmail.com> wrote: > On Sat, Apr 15, 2017 at 10:50 AM, George Neville-Neil <gnn@neville-neil.com> > wrote: > >> >> Can you explain this grief? What is the problem? >> >> Best, >> George >> > > dtrace -G requires the ability to modify the object files in-place before > linking. This causes havoc if the objects are in .a archives (dtrace can't > read those) or if the objects need to be linked into multiple binaries. It > also destroys the ability to do an incremental build, as dtrace -G can't be > run on the same object twice. > > The whole process is really a hack. The build actions done by dtrace > should be done by the compiler and linker instead. Getting the linker to > support the process would go a long way, as then dtrace -G could be run on > individual objects and most of my complaints go away. Not to detract from the issue with the -G flag, I just wanted to highlight that it's used for ELF binaries, until Apple switches away from Mach-o, this wont be an issue there (dtrace on OS X does not feature the -G flag). Sevan
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