Switch back to building as a binary.

Author: cbiffle

.gitignore

@@ -2,4 +2,3 @@ target
 .vagrant/
 .swp
 .*.swp
-build/

Cargo.toml

@@ -6,9 +6,6 @@ authors = ["cbiffle <code@cliffle.com>"]
 [dependencies]
 rust-libcore = "*"
 
-[lib]
-crate-type = ["staticlib"]
-
 [profile.dev]
 panic = "abort"
 

Makefile

@@ -56,6 +56,10 @@ complain.
 Disabling the `staticlib` crate type doesn't seem to matter.  The crate type
 being passed on the commandline is probably winning.
 
+Okay, yes.  This project is actually building as a binary, and the apparent
+crate type declaration is ignored.  The actual trick being used here is the fake
+start item.
+
 
 `#[no_mangle]` appears to affect external symbol visibility in staticlibs.  If I
 remove it from `ISR_VECTORS` the symbol is no longer visible in the object file

notes/20160916-entry.mkdn

@@ -1,5 +1,5 @@
 #![no_std]
-#![feature(lang_items)]
+#![feature(lang_items,start)]
 
 extern {
     /// This symbol is exported by the linker script, and defines the initial
@@ -73,3 +73,9 @@ extern fn panic_fmt() -> ! {loop {}}
 #[no_mangle]
 pub extern "C" fn abort() -> ! { loop {} }
 
+/// This is included to mollify the compiler, but is not actually used and
+/// doesn't wind up getting linked into the output.
+#[start]
+fn _start(_: isize, _: *const *const u8) -> isize {
+    unsafe { (ISR_VECTORS.reset)() }
+}