Re: HEADS UP: merged llvm/clang 3.4

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On 2014-03-28 17:35:09 -0400, Dimitry Andric wrote:
> On 28 Mar 2014, at 22:18, Jung-uk Kim <[e-mail]> wrote:
>> Signed PGP part On 2014-03-28 16:25:42 -0400, Craig Rodrigues
>> wrote:
>>> On Fri, Mar 28, 2014 at 11:11 AM, Dimitry Andric
>>> <[e-mail]> wrote:
>>>> 
>>>> You need to rebuild the system anyway, if you want debug 
>>>> information, so nothing changed?  If you insist on wanting to
>>>> use the crummy gdb in base, which should have been axed years
>>>> ago, then just use DEBUG_FLAGS=-gdwarf-2, otherwise use ports
>>>> gdb, which any sensible person should do.
>>>> 
>>>> -Dimitry
>>>> 
>>> 
>>> This kind of thing is OK for HEAD, but to me seems like
>>> something which is not OK for a stable branch.
>>> 
>>> Before your change:   "cc -g" from base + gdb in base =  can
>>> debug After your change:      "cc -g" from base + gdb in base =
>>> cannot debug
>>> 
>>> Is it possible to modify clang in base, so that on the stable 
>>> branches, "cc -g" will output dwarf-2 instead of dwarf-4 by 
>>> default?
>>> 
>>> I understand that installing gdb from ports, changing compiler 
>>> flags from -g to -gdwarf-2 in Makefiles, or switching to
>>> compiling with gcc are all reasonable workarounds, but this
>>> seems a bit like POLA for a stable branch.
>> 
>> Yeah, it is really unpleasant.
>> 
>> Maybe we should do something like this for stable/9 and
>> stable/10 branches (not tested).
>> 
>> --- contrib/llvm/tools/clang/lib/Driver/Tools.cpp +++
>> contrib/llvm/tools/clang/lib/Driver/Tools.cpp @@ -2628,8 +2628,9
>> @@ void Clang::ConstructJob(Compilation &C, const Job 
>> CmdArgs.push_back("-gdwarf-4"); else if
>> (!A->getOption().matches(options::OPT_g0) && 
>> !A->getOption().matches(options::OPT_ggdb0)) { -      // Default
>> is dwarf-2 for darwin. -      if
>> (getToolChain().getTriple().isOSDarwin()) +      // Default is
>> dwarf-2 for Darwin and FreeBSD. +      if
>> (getToolChain().getTriple().isOSDarwin() || +
>> getToolChain().getTriple().getOS() == llvm::Triple::FreeBSD) 
>> CmdArgs.push_back("-gdwarf-2"); else CmdArgs.push_back("-g");
> 
> I'm now testing something similar, which also tests the FreeBSD
> version, so it can be applied to head and then MFC'd.  I will
> commit it soon.

Great, thanks!

BTW, it looks like Apple went through the mess. ;-)

http://llvm.org/viewvc/llvm-project?view=revision&revision=185483
http://llvm.org/viewvc/llvm-project?view=revision&revision=195267
http://llvm.org/viewvc/llvm-project?view=revision&revision=201375
http://llvm.org/viewvc/llvm-project?view=revision&revision=201520

Jung-uk Kim
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