Hi Martin,
On 1/10/19 4:38 PM, Martin Koller wrote:
Hi,
I see that compiling Qt for wasm produces .a static libs.
This however leads to a couple of duplicate symbols when linking my existing
large application.
Here
https://emscripten.org/docs/compiling/Building-Projects.html?highlight=link#archive-a-files
I read
"Where possible it is better to generate shared library files (.so) rather than
archives (.a) — this is generally a simple change in your project’s build system. Shared
libraries are simpler, and are more predictable with respect to linking."
so my question is: why does qt/wasm not allow to be built as -shared ?
https://github.com/emscripten-core/emscripten/wiki/Linking
Probably my main concern is the performance hit of dynamic linking.
5-10% performance hit did not seem like an acceptable trade-off to me.
Not sure if the performance drop is different for running wasm instead
of the javascript like when this was first started.
As well, getting the build system to behave is easier in wasm with
static libraries.
That said, there is a task for wasm dynamic linking support, but has not
been worked on recently, and the WIP change is out of date.
https://bugreports.qt.io/browse/QTBUG-63925
--
Lorn Potter
Freelance Qt Developer. Maintainer QtSensors, Qt WebAssembly
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