[Development] Porting QT to new OS

[drwho]

On 2019-11-07 10:31 a.m., Konstantin Tokarev wrote:
> 07.11.2019, 18:08, "drwho" <drwho at infidigm.net>:
>> On 2019-11-07 12:42 a.m., Thiago Macieira wrote:
>>>   On Wednesday, 6 November 2019 20:41:10 PST martin ribelotta wrote:
>>>
>>>>   4) What about the memory footprint?
>>>   A couple of megabytes.
>> I'd love to see a build how too that results in a couple of megabytes.
>> The smallest I've ever got Qt with a "cut everything out" configure is...
>>
>>           text        data       bss         hex filename
>>
>> 5199292   129564   11596   517d24 libQt5Core.so.5.6.2
>>
>> 3904283     81384   10616   3cfa7b  libQt5Gui.so.5.6.2
>>
>> 4893838   212704       840   4deeb6 libQt5Widgets.so.5.6.2
> This is ELF section sizes, not a memory footprint. Actual memory footprint (RSS/PSS values) can be obtained from smaps file

A simple console only application (only using QtCore) I built using a 
static Qt build without -ltcg is about 4MB memory foot print on arm...

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+ COMMAND
1129 root      20   0 14244 4004 3848 S  0.0  1.6   0:00.01 simple_app

Using -ltgc saves about 31%, so aprox 3MB memory footprint.

Using a dynamically linked Qt version, I've seen memory footprints as 
low as 200K for console only applications.

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