Date: Tue, 8 Apr 2014 15:43:08 -0600 From: Warner Losh <imp@bsdimp.com> To: Steve Kargl <sgk@troutmask.apl.washington.edu> Cc: freebsd-arch <freebsd-arch@freebsd.org> Subject: Re: Time for turning off gdb by default? Or worse... Message-ID: <57ECB078-3D7A-4BE8-AA29-1ED7BB347DBD@bsdimp.com> In-Reply-To: <20140408212435.GA75404@troutmask.apl.washington.edu> References: <DD38131E-9A43-4EFA-A27D-ED6B64F6A35A@bsdimp.com> <20140408212435.GA75404@troutmask.apl.washington.edu>
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On Apr 8, 2014, at 3:24 PM, Steve Kargl = <sgk@troutmask.apl.washington.edu> wrote: > On Tue, Apr 08, 2014 at 02:34:35PM -0600, Warner Losh wrote: >=20 > (courtesy line wrap to something well below 80 characters) >=20 >> The gdb in the tree seems to be of very limited usefulness >> these days. It doesn?t seem to work on clang-enabled >> architectures w/o building -gdwarf-2, it doesn?t seem to work >> with threaded applications, and on some architectures it >> doesn?t seem to work at all (mips comes to mind, but it may >> have been the two binaries I tried). >>=20 >=20 > (patch removed) >=20 >> to the tree, which will turn gdb off by default. It may make >> more sense to just remove it entirely, but I?m not sure I want >> to go there just yet in case there are things that I?m missing. >> I believe that the port will be adequate for all architectures >> we support, but haven?t tested this directly yet. I do know >> that on amd64, the port just worked, where the in-tree gdb >> was an epic fail. >=20 > I suppose the obvious questions are: >=20 > 1) Is lldb ready for prime time? Doesn=92t matter. > 2) What effect does this have on kgdb? Note, /sys/conf/NOTES contains Unfortunately, kgdb isn=92t available as a port, so that does matter. It = is one thing arguing against this change. > #makeoptions DEBUG=3D-g #Build kernel with gdb(1) debug = symbols >=20 > Should this be updates to DEBUG=3D-gdwarf-2? Nope. It should stay exactly as it is. We convert -g to -gdwarf-2 for = those compilers that need it. > PS: You'll need to sweep src/ for references to gdb(1). No. It is just not built by default, not being kicked out of the tree. Warner
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