Date: Wed, 10 Sep 2014 12:31:20 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Pedro Giffuni <pfg@freebsd.org> Cc: freebsd-toolchain@freebsd.org, freebsd-dtrace@freebsd.org, Andriy Gapon <avg@freebsd.org> Subject: Re: WITH_CTF vs -g Message-ID: <20140910193120.GA82175@funkthat.com> In-Reply-To: <58B30723-19D6-40FA-97F7-206401C5D2A2@freebsd.org> References: <54108909.7050908@FreeBSD.org> <58B30723-19D6-40FA-97F7-206401C5D2A2@freebsd.org>
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Pedro Giffuni wrote this message on Wed, Sep 10, 2014 at 13:45 -0500: > Hi Andriy; > > Il giorno 10/set/2014, alle ore 12:23, Andriy Gapon <avg@FreeBSD.org> ha scritto: > > > > > In my opinion WITH_CTF should imply -g in CFLAGS otherwise, as far as I can see, > > there is nothing to generate CTF data from. Forcing an end-user to remember to > > additionally pass -g is not nice. > > > > My understanding is that CTF is meant to be a debugging format independent of DWARF, > so it should be especially useful for the cases where there is no debugging information. Except that the CTF data is generated from the DWARF data... Hence why you need to compile w/ -g... ctfconvert uses the DWARF data to make the CTF data... > Just like Illumos, we haven?t really made much (or any) use of CTF outside the kernel > but now that is an option: > > http://dtrace.org/blogs/rm/2013/11/14/userland-ctf-in-dtrace/ > > > > Also, I think that we can always have -g in CTFFLAGS, because the stripping step > > takes care of the original DWARF data in any case. But I am not 100% sure about > > this. > > > > > What do you think? > > > BTW, it would be nice to see what we can take from the CTF/DDB GSoC [1]. I understand > the BSD-licensed CTF library has advanced greatly but still needs more work. Yeh, I need to look at this more too as there are somethings I would like to do w/ CTF that I can't because the library we have doesn't export all the data.. -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."
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