Run builtins-test-intrinsics when possible

Currently we only build this, but it is possible to run the binary.
Change the CI script to do so here.

Author: tgross35

builtins-test-intrinsics/src/main.rs

@@ -650,14 +650,23 @@ fn something_with_a_dtor(f: &dyn Fn()) {
 
 #[no_mangle]
 #[cfg(not(thumb))]
-fn main(_argc: core::ffi::c_int, _argv: *const *const u8) -> core::ffi::c_int {
+#[cfg(not(any(thumb, windows)))]
+extern "C" fn main(_argc: core::ffi::c_int, _argv: *const *const u8) -> core::ffi::c_int {
+    run();
+    0
+}
+
+#[no_mangle]
+#[cfg(windows)]
+#[allow(non_snake_case)]
+extern "C" fn mainCRTStartup() -> core::ffi::c_int {
     run();
     0
 }
 
 #[no_mangle]
 #[cfg(thumb)]
-pub fn _start() -> ! {
+extern "C" fn _start() -> ! {
     run();
     loop {}
 }

ci/run.sh

@@ -120,15 +120,21 @@ done
 
 rm -f "${rlib_paths[@]}"
 
-build_intrinsics_test() {
-    cargo build --target "$target" -v --package builtins-test-intrinsics "$@"
+run_intrinsics_test() {
+    if [ "${NO_STD:-}" = "1" ]; then
+        cmd=build
+    else
+        cmd=run
+    fi
+
+    cargo "$cmd" --target "$target" -v --package builtins-test-intrinsics "$@"
 }
 
 # Verify that we haven't dropped any intrinsics/symbols
-build_intrinsics_test
-build_intrinsics_test --release
-build_intrinsics_test --features c
-build_intrinsics_test --features c --release
+run_intrinsics_test
+run_intrinsics_test --release
+run_intrinsics_test --features c
+run_intrinsics_test --features c --release
 
 # Verify that there are no undefined symbols to `panic` within our
 # implementations