Minimal C/C++ language toolset for building wasm files
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NOTE: this project is archived in favor of WASI SDK.
wasmception
Minimal toolset for building wasm files
Export functions
Use linker's
--exportparameter to specify exports (with clang use
-Wl,--export, e.g.
-Wl,--export=foo,--export=bar). The use of
__attribute__ ((visibility ("default"))) is no longer preferable way to make methods visible -- --export-dynamicneeds to be added.
Compile C file
$(WASMCEPTION)/dist/bin/clang --sysroot=$(WASMCEPTION)/sysroot/ hi.c -o hi.wasm -nostartfiles -Wl,--no-entry,--export=foo
Compile C++ file
$(WASMCEPTION)/dist/bin/clang++ --sysroot=$(WASMCEPTION)/sysroot/ hi.cpp -o hi.wasm -nostartfiles -Wl,--no-entry,--export=bar -fno-exceptions
Required main
and _start
functions
The
-nostartfileswill not require you to define the
mainfunction, but will be looking for the
_startfunction: use
-Wl,--no-entryclang (linker) option to avoid specified entry point. As alternative, you can add
void _start() {}
(or extern "C" void _start() { } in C++) to make linker happy due to -nostartfiles.