print the compiler version in CI, for help with debugging

3 files changed, 25 insertions, 0 deletions

diff --git a/tools/compiler_version/Cargo.toml b/tools/compiler_version/Cargo.toml
new file mode 100644
index 0000000..1046cf2
--- /dev/null
+++ b/tools/compiler_version/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "compiler_version"
+version = "0.0.0"
+edition = "2018"
+
+[build-dependencies]
+cc = "1.0.50"
diff --git a/tools/compiler_version/build.rs b/tools/compiler_version/build.rs
new file mode 100644
index 0000000..3e14ebe
--- /dev/null
+++ b/tools/compiler_version/build.rs
@@ -0,0 +1,6 @@
+fn main() {
+    let build = cc::Build::new();
+    let compiler = build.get_compiler();
+    let compiler_path = compiler.path().to_string_lossy();
+    println!("cargo:rustc-env=COMPILER_PATH={}", compiler_path);
+}
diff --git a/tools/compiler_version/src/main.rs b/tools/compiler_version/src/main.rs
new file mode 100644
index 0000000..4506cf7
--- /dev/null
+++ b/tools/compiler_version/src/main.rs
@@ -0,0 +1,12 @@
+fn main() {
+    // Set in build.rs.
+    let compiler_path = env!("COMPILER_PATH");
+
+    let mut compiler_command = std::process::Command::new(compiler_path);
+    // Use the --version flag on everything other than MSVC.
+    if !cfg!(target_env = "msvc") {
+        compiler_command.arg("--version");
+    }
+    // Run the compiler to print its version. Ignore the exit status.
+    let _ = compiler_command.status().unwrap();
+}