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dcodeIO / webassembly

A minimal toolkit and runtime to produce and run WebAssembly modules.
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Can't compile webassembly.h from cpp file #9

Closed ejmurra closed 7 years ago

ejmurra commented 7 years ago

wa compile throws 4 errors when trying to compile a c++ file that imports the webassembly header.

You can reproduce it by copying the example code in the readme into a file named program.cpp and trying to run wa compile -o program.wasm program.cpp.

Output:

Compiling on darwin-x64 ...

clang program.cpp 
 -c 
 --target=wasm32-unknown-unknown 
 -emit-llvm 
 -nostdinc 
 -nostdlib 
 -D WEBASSEMBLY 
 -isystem /Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include 
 -o /var/folders/ts/rnwyskln05vg3cbkgl5d4s5xb72qlv/T/wa1_1788ixvKyawdM9VX.tmp

In file included from program.cpp:1:
In file included from /Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include/webassembly.h:16:
/Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include/uchar.h:17:35: error: C++ requires a type specifier for all declarations
size_t c16rtomb(char *__restrict, char16_t, mbstate_t *__restrict);
                                  ^
/Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include/uchar.h:18:17: error: unknown type name 'char16_t'
size_t mbrtoc16(char16_t *__restrict, const char *__restrict, size_t, mbstate_t *__restrict);
                ^
/Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include/uchar.h:20:35: error: C++ requires a type specifier for all declarations
size_t c32rtomb(char *__restrict, char32_t, mbstate_t *__restrict);
                                  ^
/Users/emurray/.nvm/versions/node/v7.7.3/lib/node_modules/webassembly/include/uchar.h:21:17: error: unknown type name 'char32_t'
size_t mbrtoc32(char32_t *__restrict, const char *__restrict, size_t, mbstate_t *__restrict);
                ^
4 errors generated.

I've also tried extern "C" the header with the same result (and it looks like you've externed all the header files anyway.)

I should also note that I'm very new to c, cpp and learning just to play with wasm so it's very likely that I've made a silly error.

dcodeIO commented 7 years ago

In the current state of this project, C++ support is still far away. It's specifically targeting C only and also doesn't include any sort of C++ standard library.

For now you are better off using emscripten if C++ support is of importance to you.