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From: =?UTF-8?Q?Marius_N=C3=BCnnerich?= <marius@nuenneri.ch>
Date: Thu, 11 Mar 2010 10:19:19 +0100
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To: =?UTF-8?Q?C=2E_Bergstr=C3=B6m?= <cbergstrom@pathscale.com>
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Cc: freebsd-hackers@freebsd.org, Shrikanth Kamath <shrikanth07@gmail.com>
Subject: Re: ctfconvert dependency...
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2010/3/11 "C. Bergstr=C3=B6m" <cbergstrom@pathscale.com>:
> Shrikanth Kamath wrote:
>>
>> Just trying to understand the build dependency for ctfconvert...
>>
>> I see ctfconvert (cddl/usr.bin/ctfconvert/) =C2=A0has dependency on libc=
tf.a
>> (cddl/lib/libctf/)
>>
>> Now the snippet in bsd.lib.mk has this check for various target suffixes=
,
>>
>> .c.So:
>> .if defined(CTFCONVERT)
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
>> .endif
>>
>> and sys.mk
>>
>> .c
>> .if defined(CTFCONVERT)
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0${CTFCONVERT} ${CTFFLAGS} ${.TARGET}
>> .endif
>>
>> My query, libctf includes =C2=A0<bsd.lib.mk> in it's Makefile, so will t=
he
>> above
>> not try to
>> run 'ctfconvert' on libctf itself?
>>
>
> I'm going to make some assumptions and go out on a limb here..
>
> The CDDL code in FBSD came from OpenSolaris (specifically onnv-gate hg re=
po)
> =C2=A0When OpenSolaris is built they convert stab debugging information o=
ver to
> CTF (compressed text format?). =C2=A0This is done so that they can have d=
ebugging
> information, but without the overhead of stab (or dwarf2). =C2=A0I don't =
know how
> much of the original onnv-gate Makefiles came over from OpenSolaris, but
> assuming the FBSD kernel doesn't need/use CTF format this dependency can =
and
> probably should go away. =C2=A0(Only (k)mdb supports CTF that I'm aware o=
f?)
>
> Hopefully this is useful information and I'm not too wrong or someone wil=
l
> correct me

The CTF information is needed by DTrace.
My guess is that it will run ctfconvert on itself so it should be
there from a prior install or it is part of some early toolchain
stuff.