I can narrow down the issue as follows: The problem at hand occurs on a compile server, compiling desktop executables for Qt 5.15.2 (with GCC-7), Qt 6.2.2 (with GCC-9). To make both configurations work, QMAKE_CXX=g++-7 / QMAKE_CXX=g++-9 arguments are added in the respective Qt Creator build steps (which is necessary for Qt 6.2.2 even if g++-9 is specified as compiler in the kit itself).
Emscripten (intended as a 3rd compile target) has been installed according to https:// doc.qt.io/qt-6/wasm.html[1] and https://emscripten.org/docs/getting_started/ index.html[2] The emscripten installation is able to compile the latest openssl pulled from github. No matter which GCC version is chosen in /etc/alternatives and no matter which emscripten version is activated (3.0.1 or 2.0.14): .../upstream/emscripten/cache/sysroot/ include/c++ only contains the v1 directory. The server's /usr/include/c++ contains v1, 7 and 9 according to the GCC versions installed. This is where my emscripten knowledge ends and I can only experiment (e.g. by manually linking the 9 directory into the emscripten cache, which is being ignored). Compiling basic C++ code with #include <cmath> works for GCC 7 and produces the errors mentioned earlier for GCC 9 (i.e. Qt 6.2.2). Makefiles are generated by qmake out of a single .pro file. The .pro file contains a WASM specific section to link against its own libcrypto and libssl. Apart from the compilers used, all Makefiles look almost identical. => It appears to me as if emscripten uses a default GCC version, which in case of GCC 9 being expected is the wrong one. This leads to the lib incompatibility as described by Thiago. I have not found options for em++, 'emsdk install' or 'emsdk activate', that provide a GCC selection. That may well be attributable to a lack of knowledge on my side. > Well, Qt is a bit relevant if the qt-cmake of the Qt 6.2.2 WASM installation > results in broken make files. > > So the question is perhaps: Axel, assuming that you installed emscripten > following the instruction and that you can verify that you can compile > basic C++ code as Thiago suggested, how do you then generate your make > files? > > Volker > -------- [1] https://doc.qt.io/qt-6/wasm.html [2] https://emscripten.org/docs/getting_started/index.html
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