Date: Thu, 2 Dec 2010 18:51:34 -0600 From: Brandon Gooch <jamesbrandongooch@gmail.com> To: Kostik Belousov <kostikbel@gmail.com> Cc: "freebsd-toolchain@freebsd.org" <freebsd-toolchain@freebsd.org> Subject: Re: DTrace and clang -- ERROR: ctfmerge: kernel.debug: Cannot get sect .note.GNU-stack data Message-ID: <D60B7CF9-E649-43E9-81D2-C627CA2EE860@gmail.com> In-Reply-To: <20101202231033.GY2392@deviant.kiev.zoral.com.ua> References: <AANLkTinP_J5YdDWsGmg6Wh=WY6Nn537vXmB%2BRoYfRzvp@mail.gmail.com> <20101202231033.GY2392@deviant.kiev.zoral.com.ua>
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On Dec 2, 2010, at 5:10 PM, Kostik Belousov <kostikbel@gmail.com> wrote: > On Wed, Dec 01, 2010 at 11:48:10AM -0600, Brandon Gooch wrote: >> I recently attempted to enable DTrace on a system running HEAD built >> with clang, and saw this error scrolling by when the kernel and >> modules were being built: >> >> ERROR: ctfmerge: kernel.debug: Cannot get sect .note.GNU-stack data >> >> Each module being built also displayed a similar message as to the above. >> >> ERROR: ctfmerge: module_name: Cannot get sect .note.GNU-stack data >> >> I've followed instructions here for building with clang: >> >> http://wiki.freebsd.org/BuildingFreeBSDWithClang >> >> ...and here for DTrace: >> >> http://wiki.freebsd.org/DTrace >> >> I've completed several rounds of building world and kernel from SVN >> r216082 to r216095. Each time, it seems that kernel in world aren't >> "in sync" >> >> # netstat >> netstat: no namelist >> >> I can build the kernel using gcc, and DTrace (and netstat) output is >> good. I haven't rebuilt world yet with gcc, as it takes a while, but >> I'll certainly be doing that at some point I'm sure :) >> >> Any debugging hints appreciated... > > What is the revision of sources used to build the _installed_ version > of libelf.so ? Make sure that it contains r210324. > > I am unable to reproduce your problem with gcc/WITH_CTF=1, where gcc > config is changed to emit .note.GNU-stack marker sections, similar to > clang config. I wasn't able to produce it using GCC either :) I was informed that using DTrace with a clang-built system isn't supported. -Brandon
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