Bug 9684 – rdmd -lib <filename> produces corrupted file

The original test case from issues 6535 --- module lib; import std.stdio; void libraryFunction() { writeln("You have executed the library function!"); } --- rdmd --build-only -lib lib.d --- works with rdmd from Git master, but if the command is replaced with just "rdmd -lib lib.d", i.e. the --build-only flag is not specified, it still creates a corrupt library file, at least on Linux. rdmd should probably default to the equivalent of --build-only if -lib is specified.

I just tried this on Linux with `rdmd build 20201024` (distributed with LDC v1.24). I made `libraryFunction` extern(C) for simplicity and tried to compile the final executable with `{dmd,ldc2} main.d mylib.a`. Both calls worked, so closing as WORKSFORME.