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Re: [PATCH] meson: change buildtype when debug_info=no
From: |
Philippe Mathieu-Daudé |
Subject: |
Re: [PATCH] meson: change buildtype when debug_info=no |
Date: |
Thu, 29 Apr 2021 11:55:01 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 |
On 4/29/21 9:33 AM, Joelle van Dyne wrote:
> On Wed, Apr 28, 2021 at 10:07 PM Philippe Mathieu-Daudé
> <philmd@redhat.com> wrote:
>>
>> On 4/28/21 9:55 PM, Joelle van Dyne wrote:
>>> Meson defaults builds to 'debugoptimized' which adds '-g -O2'
>>> to CFLAGS. If the user specifies '--disable-debug-info' we
>>> should instead build with 'release' which does not emit any
>>> debug info.
>>>
>>> Signed-off-by: Joelle van Dyne <j@getutm.app>
>>> ---
>>> configure | 1 +
>>> 1 file changed, 1 insertion(+)
>>>
>>> diff --git a/configure b/configure
>>> index 4f374b4889..5c3568cbc3 100755
>>> --- a/configure
>>> +++ b/configure
>>> @@ -6398,6 +6398,7 @@ NINJA=$ninja $meson setup \
>>> --sysconfdir "$sysconfdir" \
>>> --localedir "$localedir" \
>>> --localstatedir "$local_statedir" \
>>> + --buildtype $(if test "$debug_info" = yes; then echo
>>> "debugoptimized"; else echo "release"; fi) \
>>
>> NAck. You are changing the default (which is 'debug') to 'release'.
>
> I thought 'debugoptimized' was the default? From my build logs,
> there's always '-g -O2' which is why I needed to make this change. The
> default for 'debug_info' is yes so this keeps it on 'debugoptimized'
> and uses 'release' when explicitly disabling debug_info.
Again, I'm not concerned between 'debugoptimized' VS 'debug',
I'm worried to use 'release', because of the b_ndebug=if-release
option which disable assertions (unsupported QEMU build mode).
Also, 'release' sets optimization=3 which isn't supported neither.
Per https://mesonbuild.com/Builtin-options.html#build-type-options
All other combinations of debug and optimization set buildtype
to 'custom'.
So maybe this is what you want, with debug=false and optimization=2?
>
>>
>> This should be at least mentioned in the commit description, but
>> I don't think this is what we want here. 'release' enables -O3,
>> which is certainly not supported. The 'debug' profile is what we
>> have been and are testing.
>>
>> I'd be OK if you had used "debugoptimized else debug".
>>
>> The mainstream project would rather use 'debug'/'debugoptimized', or
>> 'minsize', which are already tested. We might consider allowing forks
>> to use 'plain' profile eventually. But the 'release' type is an
>> unsupported landmine IMHO.
>>
>> If you want to use something else, it should be an explicit argument
>> to ./configure, then you are on your own IMO.
>
> What do I need to avoid '-g'?
Why don't you simply use ./configure --extra-cflags='-g0 -O2'?
Regards,
Phil.