build Qt 6.3.0 to generate WebAssembly library framework.

[Renio]

I try to build Qt 6.3.0 to generate WebAssembly library framework.
I followed the instruction illustradet in
[https://doc.qt.io/qt-6/wasm.html](link url)
and in a powershell I executed this command:

./configure -qt-host-path C:\Qt\6.3.0\Src  -no-warnings-are-errors -platform wasm-emscripten -prefix %CD%\qtbase

and I obtain this error:

Configuring 'qtbase'
-- Warning: Did not find file Compiler/-ASM
CMake Error at qtbase/cmake/QtBaseConfigureTests.cmake:27 (message):
  Failed to build architecture extraction project.  Build output:

   Change Dir: C:/Qt/6.3.0/Src/qtbase/config.tests/arch



  Run Build Command(s):C:/Qt/Tools/Ninja/ninja.exe && [1/2] Building CXX
  object CMakeFiles/architecture_test.dir/arch.cpp.o

  FAILED: CMakeFiles/architecture_test.dir/arch.cpp.o

  C:\Repository\emsdk_fra\emsdk\upstream\emscripten\em++.bat /DWIN32
  /D_WINDOWS /GR -g -O2 -msimd128 -msse -msse2 -std=gnu++17 -MD -MT
  CMakeFiles/architecture_test.dir/arch.cpp.o -MF
  CMakeFiles\architecture_test.dir\arch.cpp.o.d -o
  CMakeFiles/architecture_test.dir/arch.cpp.o -c
  C:/Qt/6.3.0/Src/qtbase/config.tests/arch/arch.cpp

  em++: error: /DWIN32: No such file or directory ("/DWIN32" was expected to
  be an input file, based on the commandline arguments provided)

  ninja: build stopped: subcommand failed.
Call Stack (most recent call first):
-- Configuring incomplete, errors occurred!
  qtbase/cmake/QtBaseConfigureTests.cmake:173 (qt_run_config_test_architecture)
  qtbase/cmake/QtBaseConfigureTests.cmake:186 (qt_run_qtbase_config_tests)
  qtbase/CMakeLists.txt:119 (include)

See also "C:/Qt/6.3.0/Src/CMakeFiles/CMakeOutput.log".
See also "C:/Qt/6.3.0/Src/CMakeFiles/CMakeError.log".
CMake Error at qtbase/cmake/QtProcessConfigureArgs.cmake:963 (message):
  CMake exited with code 1.

The step executed immediatly before, was to configure the vc environment across this command:

C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build> .\vcvarsall.bat x64

I tryed to use this command

configure -no-warnings-are-errors -xplatform wasm-emscripten -platform win32-g++ -nomake examples -prefix %CD%\qtbase

how indicated on

https://wiki.qt.io/Qt_for_WebAssembly

I don't have installed the asm compiler because isn't necessary for my job.
Can someone explain where I wrong?

I use:
Windows10 64 bit
cmake version 3.21.1
ninja version 1.10.2
perl v5.32.1 built for MSWin32-x64-multi-thread
Python 3.9.5

[edit]
I founded this topic.
https://forum.qt.io/topic/136045/build-qt6-3-wasm-from-source-configure-error
I had changed the qt path, and my process goes a little step toward, but obtain the same error!

[lorn.potter]

@Renio said in build Qt 6.3.0 to generate WebAssembly library framework.:

qt-host-path

qt-host-path is meant to be the path to the Qt binary installation for the host platform. so qt-host-path C:\Qt\6.3.0\mingw_64 or C:\Qt\6.3.0\msvc2019_64

[Renio]

@lorn-potter Thanks for your suggestion, but I obtain this error

./configure.bat -qt-host-path c:\Qt\6.3.0\mingw_64 -no-warnings-are-errors -platform wasm-emscripten -prefix c:\Qt\6.3.0\Src\qtbase
'C:/Qt/Tools/CMake_64/bin/cmake.exe' '-DQT_HOST_PATH=c:/Qt/6.3.0/mingw_64' '-DWARNINGS_ARE_ERRORS=OFF' '-DCMAKE_INSTALL_PREFIX=c:/Qt/6.3.0/Src/qtbase' '-DQT_QMAKE_TARGET_MKSPEC=wasm-emscripten' '-G' 'Ninja' 'C:/Qt/6.3.0/Src/qtbase'
-- Reusing cached Emscripten 3.1.6 toolchain file detected at C:/Repository/emsdk_fra/emsdk//upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake
CMake Error at cmake/QtBaseConfigureTests.cmake:27 (message):
  Failed to build architecture extraction project.  Build output:

   Change Dir: C:/Qt/6.3.0/Src/qtbase/config.tests/arch



  Run Build Command(s):C:/Qt/Tools/Ninja/ninja.exe && [1/2] Building CXX
  object CMakeFiles\architecture_test.dir\arch.cpp.obj

  FAILED: CMakeFiles/architecture_test.dir/arch.cpp.obj


  C:\PROGRA~2\MICROS~2\2019\ENTERP~1\VC\Tools\MSVC\1429~1.300\bin\Hostx64\x64\cl.exe
  /nologo /TP /DWIN32 /D_WINDOWS /GR /Zi /RTC1 -MDd -O2 -msimd128 -msse
  -msse2 -std:c++17 /showIncludes
  /FoCMakeFiles\architecture_test.dir\arch.cpp.obj
  /FdCMakeFiles\architecture_test.dir\ /FS -c
  C:\Qt\6.3.0\Src\qtbase\config.tests\arch\arch.cpp

  cl : error della riga di comando D8016 : le opzioni della riga di comando
  '/RTC1' e '/O2' non sono compatibili

  ninja: build stopped: subcommand failed.



Call Stack (most recent call first):
  cmake/QtBaseConfigureTests.cmake:173 (qt_run_config_test_architecture)
  cmake/QtBaseConfigureTests.cmake:186 (qt_run_qtbase_config_tests)
  CMakeLists.txt:119 (include)

-- Configuring incomplete, errors occurred!

See also "C:/Qt/6.3.0/Src/qtbase/CMakeFiles/CMakeOutput.log".
See also "C:/Qt/6.3.0/Src/qtbase/CMakeFiles/CMakeError.log".
CMake Error at cmake/QtProcessConfigureArgs.cmake:963 (message):
  CMake exited with code 1.

[Renio]

I solved! starting from a clean situation:
I removed the source code using the Qt MaintenanceTool.
I erased the dirty file contained in Src directory.
I added the source code using the Qt MaintenanceTool.
Now in a powershell in windows I ran this command

.\configure.bat -qt-host-path C:\Qt\6.3.0\mingw_64\  -no-warnings-are-errors -platform wasm-emscripten -prefix %CD%\qtbase

and followed the instruction in this post.

[https://forum.qt.io/topic/136045/build-qt6-3-wasm-from-source-configure-error](link url)

I appliated the patch indicated in this post.

[https://bugreports.qt.io/browse/QTBUG-103498](link url)

I ran the compile command

cmake --build . --parallel.

The last step, I most execute the installation of the wasm library patched, but I don have idea how