refactor the linker script

to make it more compatible with LLD. This commit contains no functional changes.

fixes #70

Overview of changes:

- Alignment checks are enabled now that rust-lld (LLD 7.0) supports the modulo
operator.

- Removed some private symbols (e.g. __foo) in favor of ADDR and SIZEOF.

- Turned .got into a NOLOAD section now that rust-lld supports it.

- Replaced `ABSOLUTE(.)` with `.` as an old LLD overlap bug seems to be gone and
ABSOLUTE seems to cause problems, like #70, on bigger programs.

- Made the linker assertion messages more uniform.

- Extended test suite to check that linking works with both rust-lld and GNU
LD.

1 files changed, 4 insertions, 4 deletions

diff --git a/cortex-m-rt/build.rs b/cortex-m-rt/build.rs
index 8edba9f..fc53d79 100644
--- a/cortex-m-rt/build.rs
+++ b/cortex-m-rt/build.rs
@@ -42,12 +42,12 @@ INCLUDE device.x"#
     writeln!(
         f,
         r#"
-ASSERT(__einterrupts - __eexceptions <= 0x{:x}, "
-There can't be more than {} interrupt handlers. This may be a bug in
-your device crate, or you may have registered more than 240 interrupt
+ASSERT(SIZEOF(.vector_table) <= 0x{:x}, "
+There can't be more than {1} interrupt handlers. This may be a bug in
+your device crate, or you may have registered more than {1} interrupt
 handlers.");
 "#,
-        max_int_handlers * 4,
+        max_int_handlers * 4 + 0x40,
         max_int_handlers
     ).unwrap();