Date: Mon, 17 Apr 2017 16:46:25 -0400 From: "George Neville-Neil" <gnn@neville-neil.com> To: "Sevan / Venture37" <venture37@gmail.com> Cc: "Ryan Stone" <rysto32@gmail.com>, freebsd-gecko@freebsd.org, "Jan Beich" <jbeich@freebsd.org>, "freebsd-dtrace@freebsd.org" <freebsd-dtrace@freebsd.org> Subject: Re: DTrace issues? Message-ID: <27FA81DC-3939-4798-AB4D-C4BBE86B6AAB@neville-neil.com> In-Reply-To: <CA%2BU3Mf4y4yyqdmXiHANniu3eeYF5WMhd8jXMiWGs13Z3a3-=OQ@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> <CA%2BU3Mf4y4yyqdmXiHANniu3eeYF5WMhd8jXMiWGs13Z3a3-=OQ@mail.gmail.com>
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On 17 Apr 2017, at 16:28, Sevan / Venture37 wrote: > 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). > > Well at least I now "get" the issue. Thanks. Best, Georgehome | help
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