[Linker] Handle archive files

Add a class to parse archive files.
Support linking archive files, with archive semantics (i.e. an archive
member is linked in if it satisfies an undefined reference).
Archive files must be gnu-format archives containing .s files.
Add tests for linking semantics.

1 files changed, 3 insertions, 0 deletions

diff --git a/test/linker/foo.c b/test/linker/foo.c
new file mode 100644
index 000000000..187032ae2
--- /dev/null
+++ b/test/linker/foo.c
@@ -0,0 +1,3 @@
+int foo() {
+  return 43;
+}