Try #182:

assemble.sh

@@ -22,4 +22,7 @@ ar crs bin/thumbv7em-none-eabihf.a bin/$crate.o
 arm-none-eabi-as -march=armv8-m.base asm.s -o bin/$crate.o
 ar crs bin/thumbv8m.base-none-eabi.a bin/$crate.o
 
+arm-none-eabi-as -march=armv8-m.main asm.s -o bin/$crate.o
+ar crs bin/thumbv8m.main-none-eabi.a bin/$crate.o
+
 rm bin/$crate.o

build.rs

@@ -8,7 +8,6 @@ fn main() {
  let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
  has_fpu(&target);
- let is_armv6m = is_armv6m(&target);
 
  if target.starts_with("thumbv") {
  fs::copy(
@@ -43,7 +42,21 @@ INCLUDE device.x"#
  f
  };
 
- let max_int_handlers = if is_armv6m { 32 } else { 240 };
+ let max_int_handlers = if target.starts_with("thumbv6m-") {
+ println!("cargo:rustc-cfg=cortex_m");
+ println!("cargo:rustc-cfg=armv6m");
+ 32
+ } else if target.starts_with("thumbv7m-") || target.starts_with("thumbv7em-") {
+ println!("cargo:rustc-cfg=cortex_m");
+ println!("cargo:rustc-cfg=armv7m");
+ 240
+ } else if target.starts_with("thumbv8m") {
+ println!("cargo:rustc-cfg=cortex_m");
+ println!("cargo:rustc-cfg=armv8m");
+ 240
+ } else {
+ panic!("Unexpected target {:?}", target);
+ };
 
  // checking the size of the interrupts portion of the vector table is sub-architecture dependent
  writeln!(
@@ -58,6 +71,10 @@ handlers.");
  max_int_handlers
  ).unwrap();
 
+ if target.ends_with("-eabihf") {
+ println!("cargo:rustc-cfg=has_fpu");
+ }
+
  println!("cargo:rustc-link-search={}", out.display());
 
  println!("cargo:rerun-if-changed=build.rs");
@@ -69,12 +86,3 @@ fn has_fpu(target: &str) {
  println!("cargo:rustc-cfg=has_fpu");
  }
 }
-
-fn is_armv6m(target: &str) -> bool {
- if target.starts_with("thumbv6m-") {
- println!("cargo:rustc-cfg=armv6m");
- true
- } else {
- false
- }
-}