Merge branch 'feature-c-unit-tests'

Author: benma

Diff for: src/rust/bitbox02-rust-c/Cargo.toml

@@ -59,17 +59,21 @@ target-c-unit-tests = [
   # enable these features
   "app-bitcoin",
   "app-ethereum",
-  "firmware"
+  "firmware",
+  "c-unit-testing",
 ]
 
 platform-bitbox02 = []
 
 bootloader = []
 firmware = ["bitbox02-rust", "bitbox02", "bitbox02-noise", "sha2"]
 
-# Only to be enabled in unit tests.
+# Only to be enabled in Rust unit tests.
 testing = ["bitbox02-rust/testing", "bitbox02/testing"]
 
+# Active when the Rust code is compiled to be linked into the C unit tests and simulator.
+c-unit-testing = ["bitbox02-rust/c-unit-testing", "bitbox02/c-unit-testing"]
+
 app-ethereum = [
   # enable this dep
   "sha3",

Diff for: src/rust/bitbox02-rust/Cargo.toml

@@ -115,4 +115,6 @@ testing = [
 
   # enable these features
   "bitbox02/testing"
-]
+]
+
+c-unit-testing = []

Diff for: src/rust/bitbox02/Cargo.toml

@@ -29,6 +29,8 @@ lazy_static = { version = "1.4.0", optional = true }
 [features]
 # Only to be enabled in unit tests.
 testing = ["lazy_static"]
+# Active when the Rust code is compiled to be linked into the C unit tests and simulator.
+c-unit-testing = []
 
 app-ethereum = []
 app-bitcoin = []

Diff for: src/rust/bitbox02/src/lib.rs

@@ -176,7 +176,7 @@ pub fn reboot() -> ! {
     panic!("reboot called")
 }
 
-#[cfg(feature = "testing")]
+#[cfg(any(feature = "testing", feature = "c-unit-testing"))]
 pub fn print_stdout(msg: &str) {
     unsafe {
         bitbox02_sys::printf(crate::util::str_to_cstr_vec(msg).unwrap().as_ptr());