WebAssembly | error: invalid argument '-std=c++11' not allowed with 'C/ObjC'

Question

I have a project containing both C++ and C files which I am compiling from the command line with Emscripten using this command:

emcc -s WASM=1 -o output.html -s "EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap', 'Pointer_stringify']" -s ASSERTIONS=1 -O1 -O2 -O3 -std=c++11 -s ALLOW_MEMORY_GROWTH=1 -s NO_EXIT_RUNTIME=1  file1.cpp file2.c

I need to use c++11 for this to work but because some of the files are in C it gives this error:

error: invalid argument '-std=c++11' not allowed with 'C/ObjC'

Is there some way I can tell the compiler to only use c++11 for the C++ files but not the C files?

You can compile and link separately, i.e. compile `file1.cpp` and `file2.c` and then link `file1.o` and `file2.o`. — Ulrich Eckhardt, Apr 23 '18 at 05:19

score -1 · Answer 1 · answered Aug 09 '21 at 15:54

-1

Yes, you can use the environment variable CXXFLAGS to do so.

In practice, in your case, you should split the command line in two: one for C++ files, one for C files. This is what we usually find in Makefiles.

answered Aug 09 '21 at 15:54

Victor Paléologue

2,025
1
17
27

WebAssembly | error: invalid argument '-std=c++11' not allowed with 'C/ObjC'

1 Answers1