Debugging ports

[Piotr Kubaj]

Shouldn't lldb be the replacement for gdb in base?

On 17-10-18 09:47:25, Guido Falsi wrote:
>On 10/18/2017 06:33, Jan Beich wrote:
>> Kubilay Kocak <koobs at FreeBSD.org> writes:
>>
>>> On 10/18/17 8:29 AM, Jan Beich wrote:
>>>
>>>> Guido Falsi <mad at madpilot.net> writes:
>>>>
>>>>> On 10/17/2017 23:11, Guido Falsi wrote:
>>>>>
>>>>>>>
>>>>>>> Thing is, recompiling with WITH_DEBUG doesn't help (I only get
>>>>>>> memory addresses in gdb), nor does -DCMAKE_BUILD_TYPE=Debug to
>>>>>>> CMAKE_ARGS (the port uses CMake).
>>>>>
>>>>> Sorry, I clearly did not parse your message correctly.
>>>>>
>>>>> Looks strange though, WITH_DEBUG always worked for me... Usually I
>>>>> compile the whole set in poudriere with WITH_DEBUG, to make sure all
>>>>> libraries have symbols too.
>>>>
>>>> WITH_DEBUG doesn't disable vendor optimizations like -fomit-frame-pointer
>>>> which may hinder stack unwinding, doesn't enable debug symbols for ports
>>>> not respecting CFLAGS, often a nop for non-C/C++ ports, etc.
>>>
>>> Could the framework WITH_DEBUG block remove this (and potentially) other
>>> relevant flags from C*FLAGS if present with variable modifiers?
>>
>> Only for what make(1) inherits when Mk/bsd.port.mk is parsed. A lot more
>> ports pass the option via makefiles under WRKSRC that cannot be altered
>> short of patching or overriding all CFLAGS.
>>
>> To get accurate list of offenders an -exp run WITH_DEBUG=1 is required
>> then grep(1) build logs for -fomit-frame-pointer and -O* flags. This can
>> result in bugs against ports that fail to properly respect CFLAGS, so the
>> port maintainers can help with patches.
>
>I'm preparing a patch related to WITH_DEBUG, which, if accepted, will
>need an exp-run before going in.
>
>That would be a good chance to perform a check for these kind of things.
>
>But I'm still working on it and will need a little more time. I'll let
>you know as soon as I have something I am willing to show.
>
>BTW on head gdb is gone from base for i386/amd64 AFAIK, so ports gdb
>will be the only way to go in the future.
>
>-- 
>Guido Falsi <mad at madpilot.net>
>
>-- 
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>

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