Option `-Wl,-R` not supported

[hoodmane]

The ld docs say that -R is the same as -rpath if the provided path is a directory:

  -R FILE, --just-symbols FILE
                              Just link symbols (if directory, same as --rpath)

But it is a hard error on Emscripten:

$ echo 'int main(){ return 0; }' > a.c
$ gcc -Wl,-R/a/b a.c # works
$ clang -Wl,-R/a/b a.c # works
$ emcc -Wl,-R/a/b a.c # fails
wasm-ld: error: unknown argument: -R/a/b

[sbc100]

Should be and easy enough wasm-ld fix if we want to support that. Do maybe users really use that flag instead of -rpath?

[sbc100]

Would you mind filing a bug instead against wasm-ld in the llvm repo?