Enhance Rust support

- Adds a `crate_type` kwarg to library targets, allowing the different
  types of Rust [linkage][1].
- Shared libraries use the `dylib` crate type by default, but can also
  be `cdylib`
- Static libraries use the `rlib` crate type by default, but can also
  be `staticlib`
- If any Rust target has shared library dependencies, add the
  appropriate linker arguments, including rpath for the sysroot of the
  Rust compiler

[1]: https://doc.rust-lang.org/reference/linkage.html

1 files changed, 8 insertions, 0 deletions

diff --git a/test cases/rust/4 polyglot/prog.c b/test cases/rust/4 polyglot/prog.c
new file mode 100644
index 000000000..18f2c36fc
--- /dev/null
+++ b/test cases/rust/4 polyglot/prog.c
@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+void f();
+
+int main() {
+    printf("Hello from C!\n");
+    f();
+}