Error while compiling static library with emscripten

[Smithangshu]

trafficstars

Please include the following in your bug report:

Version of emscripten/emsdk: 3.1.59

I am getting following error while trying to compile a library with emscripten in windows to produce *.a files.

D:\Gits\standardLib\build>emmake make make: C:\mingw64\bin\mingw32-make.EXE [ 0%] Building CXX object CMakeFiles/standardLib.dir/src/absolute_soap/modules/main.cpp.o clang++: error: unsupported option '-march=' for target 'wasm32-unknown-emscripten' mingw32-make.EXE[2]: *** [CMakeFiles\standardLib.dir\build.make:76: CMakeFiles/standardLib.dir/src/absolute_soap/modules/main.cpp.o] Error 1 mingw32-make.EXE[1]: *** [CMakeFiles\Makefile2:120: CMakeFiles/standardLib.dir/all] Error 2 mingw32-make.EXE: *** [Makefile:145: all] Error 2 emmake: error: 'C:\mingw64\bin\mingw32-make.EXE' failed (returned 2)

[sbc100]

Somewhere -march= is being added to the command line where it probably should not. Can you add VERBOSE=1 to your make command so we can see the full failing command?

[izogfif]

Try using emscripten 3.1.40. In my setup 3.1.40 works but 3.1.41 and all newer versions fail with this error (I'm trying to build ffmpeg.wasm using Docker image emscripten/emsdk:3.1.40 and it fails if I try using a newer version of emscripten Docker image, error happens during build of libx265). Apparently, something was broken in 3.1.41 and hadn't been fixed ever since.

[sbc100]

It could be that 3.1.40 was less strict about allowing the offending -march flag, but the correct fix here is to stop passing that argument. Its a sign that the build system is confused/wrong.