On 2021-08-30 20:48, Thiago Macieira wrote:
On Monday, 30 August 2021 10:32:03 PDT Henry Skoglund wrote:
configure that has a "-skip xxxx" for all
modules expect qtbase.
That makes zero difference in your final binary.
If you need a library that wasn't compiled, your application will fail to
link. If you have a library that your application doesn't link to, it won't be
linked to.
The convenience "-skip" option to the top-level configure is not at all the
same as the feature system that we're discussing.
When using MinGW 8.1.0 the .exe size is 19151 kB and when using MSVC2019
it becomes 11616 kB, i.e. 40% smaller.
Do note that both QtCore and QtGui are compiled with -O3, which expands code
size, when using GCC or Clang. There's no equivalent option to MSVC. You may
want to disable this feature too and stick to -O2.
You may also want to optimise for size, at the expense of runtime performance.
That's usually not worth it.
Thanks Thiago for the clarification re. those "-skip xxx" options. I
guess I can skip them :-)
Ok, one benefit remains: saving some time when compiling/building the
static Qt version.
Re. compiler options, I'm too lazy and just go with the default settings
that Qt gives me, and since they provided a 40% decrease of the final
.exe size when switching to MSVC I'm happy.
Riddle me this though:
for 5.15.2 I built 2 MSVC versions: one with built-in SSL 1.1.1K support
and one without.
When I build a hello world widget app, the .exe file without SSL lands
at 10541 kB but the one *with* SSL 1.1.1K support is 10531 kB. Why is
the .exe file with more functionality smaller??
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