On 29 Mar 2017, at 17:53, Brooks Davis <bro...@freebsd.org> wrote: > > On Mon, Mar 27, 2017 at 03:25:04AM -0700, Mark Millard wrote: ... >> This is extreme enough that next time I synchronize >> /usr/ports and it has a devel/llvm40 update I'll >> likely rebuild devel/llvm40 without using WITH_DEBUG= . >> I'm more concerned with the time it takes than with >> the file system space involved. > > In the case of LLVM, enabling debug builds does a LOT more than adding > symbols. It's much more like enabling WITNESS and INVARIANTS in your > kernel, except that the performance of the resulting binary is much > worse than a WITNESS kernel (more like 10x slowdown). > > As Dimitry points out, these builds are of questionable value in ports > so garbage collecting the knob might be the sensable thing to do.
I suggest that for the LLVM ports, the DEBUG option should set the RelWithDebInfo build type for CMake. That will give you binaries which can produce good backtraces, and a fair chance at debugging, in a pinch. -Dimitry
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