Merge #107

107: Disable default-features on rand dependency to avoid std version r=japaric a=therealprof

Due to the single dependency tree, the attempted use of a std version
flips all depending crates to the std version as well which will not
compile on no_std systems.

Fixes #105

Signed-off-by: Daniel Egger <daniel@eggers-club.de>

Co-authored-by: Daniel Egger <daniel@eggers-club.de>

1 files changed, 24 insertions, 0 deletions

diff --git a/cortex-m-rt/examples/rand.rs b/cortex-m-rt/examples/rand.rs
new file mode 100644
index 0000000..e0cfd31
--- /dev/null
+++ b/cortex-m-rt/examples/rand.rs
@@ -0,0 +1,24 @@
+//! Use rand crate to ensure it's configured for no_std compatbility
+
+#![deny(warnings)]
+#![no_main]
+#![no_std]
+
+extern crate cortex_m_rt as rt;
+use rt::entry;
+
+extern crate panic_semihosting;
+
+extern crate rand;
+use rand::Rng;
+use rand::SeedableRng;
+
+// the program entry point
+#[entry]
+fn main() -> ! {
+    let seed: [u8; 32] = [0; 32];
+    let mut rng = rand::ChaChaRng::from_seed(seed);
+    let _ = rng.gen::<u32>();
+
+    loop {}
+}