Duplicate symbol when using no arguments version of main with lto

[caspervonb]

The linker is fussing about duplicate symbol __original_main when trying to use main with the signature int main(void)

Related #112

[sunfishcode]

Thanks for the report! I'm unfortunately not able to reproduce this. Would you mind posting more information, such as your full test case, the platform you're on, and the command-line arguments you're compiling and linking with?

[caspervonb]

The test program was just a bare-bones main.

int main(void) {
  return 0;
}

But it seems that link time optimisations is the culprit, the following fails

/opt/wasi-sdk-8.0/bin/clang --target=wasm32-wasi --sysroot=/opt/wasi-sdk-8.0/share/wasi-sysroot -flto  -o obj/main.o -c src/main.c

/opt/wasi-sdk-8.0/bin/clang --target=wasm32-wasi --sysroot=/opt/wasi-sdk-8.0/share/wasi-sysroot -flto  -o main.wasm obj/main.o
wasm-ld: error: duplicate symbol: __original_main

But if i remove -flto it works fine.

/opt/wasi-sdk-8.0/bin/clang --target=wasm32-wasi --sysroot=/opt/wasi-sdk-8.0/share/wasi-sysroot -o obj/main.o -c src/main.c
/opt/wasi-sdk-8.0/bin/clang --target=wasm32-wasi --sysroot=/opt/wasi-sdk-8.0/share/wasi-sysroot -o main.wasm obj/main.o

[sunfishcode]

Thanks! I've now submitted #138 with a fix.